Pub Date : 2025-12-09DOI: 10.1016/j.electacta.2025.147992
Zhe Wang , Yueyuan Xu , Shiguan Xu , Wei Sun , Hongyu Wang , Yuhao Huang
Halogen-graphite intercalation compounds (HGICs)-based positive electrodes have gathered significant attention within the aqueous zinc dual-ion battery (ADIZBs) domain. To achieve a stable anodic electrode process with a high capacity of ∼250 mAh g-1 (for [BrCl]-GICs 1.6∼2 V vs. Zn/Zn2+), the presence of both Br- and Cl- anions is essential for this step-wise intercalation mechanism. This makes ZnCl2-based water-in-salt electrolytes (WISEs) with bromide additives promising electrolyte systems. However, these bromides are generally regarded as source of Br-, while role of their accompanying cations remains poorly understood due to challenges in experimental analysis. In this work, three representative bromides (LiBr, NaBr, and KBr) were introduced separately as additives into ZnCl2-based WISEs for constructing AZDIBs. Through a combination of ex-situ/in-situ electrochemical analysis and computational simulations, we investigated the ion solvation behavior and the anion storage mechanism in graphite electrodes. Our results reveal that the incorporated cations significantly influence the reorganization of the solvation shell of Br- anions, which consequently affects key electrochemical properties, including mass transport/charge transfer resistance and the lattice structure of the resulting HGICs. This study highlights the critical role of interfacial solvation structure reorganization and offers atomic-level insights for the rational design of electrolytes for high-performance AZDIBs.
卤素石墨嵌层化合物(hgic)基正极在水锌双离子电池(adizb)领域引起了广泛的关注。为了实现具有~ 250 mAh g-1高容量的稳定阳极电极工艺(对于[BrCl]- gics 1.6 ~ 2 V vs. Zn/Zn2+), Br-和Cl-阴离子的存在对于这种逐步插入机制至关重要。这使得以zncl2为基础的盐中水电解质(WISEs)与溴化物添加剂成为很有前途的电解质体系。然而,这些溴化物通常被认为是Br-的来源,而由于实验分析的挑战,它们的伴随阳离子的作用仍然知之甚少。在这项工作中,三种具有代表性的溴化物(LiBr, NaBr和KBr)分别作为添加剂添加到zncl2基WISEs中,用于构建azdib。通过非原位/原位电化学分析和计算模拟相结合的方法,研究了石墨电极中离子的溶剂化行为和阴离子的储存机制。我们的研究结果表明,掺入的阳离子显著影响了Br-阴离子的溶剂化壳的重组,从而影响了hgic的关键电化学性能,包括质量传输/电荷转移电阻和所得到的hgic的晶格结构。该研究强调了界面溶剂化结构重组的关键作用,并为高性能azdib电解质的合理设计提供了原子水平的见解。
{"title":"The cation effect on halogen intercalation into graphite electrode in aqueous zinc dual-ion batteries","authors":"Zhe Wang , Yueyuan Xu , Shiguan Xu , Wei Sun , Hongyu Wang , Yuhao Huang","doi":"10.1016/j.electacta.2025.147992","DOIUrl":"10.1016/j.electacta.2025.147992","url":null,"abstract":"<div><div>Halogen-graphite intercalation compounds (HGICs)-based positive electrodes have gathered significant attention within the aqueous zinc dual-ion battery (ADIZBs) domain. To achieve a stable anodic electrode process with a high capacity of ∼250 mAh g<sup>-1</sup> (for [BrCl]-GICs 1.6∼2 V vs. Zn/Zn<sup>2+</sup>), the presence of both Br<sup>-</sup> and Cl<sup>-</sup> anions is essential for this step-wise intercalation mechanism. This makes ZnCl<sub>2</sub>-based water-in-salt electrolytes (WISEs) with bromide additives promising electrolyte systems. However, these bromides are generally regarded as source of Br<sup>-</sup>, while role of their accompanying cations remains poorly understood due to challenges in experimental analysis. In this work, three representative bromides (LiBr, NaBr, and KBr) were introduced separately as additives into ZnCl<sub>2</sub>-based WISEs for constructing AZDIBs. Through a combination of ex-situ/in-situ electrochemical analysis and computational simulations, we investigated the ion solvation behavior and the anion storage mechanism in graphite electrodes. Our results reveal that the incorporated cations significantly influence the reorganization of the solvation shell of Br<sup>-</sup> anions, which consequently affects key electrochemical properties, including mass transport/charge transfer resistance and the lattice structure of the resulting HGICs. This study highlights the critical role of interfacial solvation structure reorganization and offers atomic-level insights for the rational design of electrolytes for high-performance AZDIBs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"548 ","pages":"Article 147992"},"PeriodicalIF":5.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145711329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rechargeable all-solid-state batteries (ASSBs) offer promising advantages in terms of safety, energy density, and long cycle lifetime. Although an understanding of capacity degradation is crucial for accurately predicting the lifetimes of rechargeable batteries, theoretical kinetic studies evaluating capacity fading in ASS lithium-ion batteries (LIBs) have been relatively limited. In contrast to liquid-electrolyte-based LIBs, in which the mechanism of capacify fading due to state-of-charge (SOC) imbalance is relatively well understood, these phenomena are only beginning to be systematically elucidated in ASS-LIBs. This study addressed this gap by investigating the fundamental relationship between the SOC imbalance and rate of side reactions in a Li[Li1/3Ti5/3]O4/LiCoO2 ASSB with a three-electrode cell configuration during repeated cycling at different temperatures. The obtained cumulative capacity plots facilitated quantification of the rates of side reactions at the electrodes using the side-reaction current (ISR), which exhibited Arrhenius-type temperature dependence. Capacity fading in the ASSB was determined to be governed by the SOC imbalance, and a theoretical model linking this imbalance to the ISR values at the electrodes was established accordingly. The resulting equation enabled the accurate prediction of battery lifetime based on ISR and indicated an excellent lifetime for the evaluated ASSB, even at elevated temperatures. Thus, this study not only revealed the capacity fading mechanism in the ASS-LIB but also demonstrated a new theoretical framework for predicting its long-term performance, contributing to the design of more durable and reliable ASSBs.
{"title":"Predicting all-solid-state lithium-ion battery lifetime via state-of-charge imbalance-driven side reaction kinetics","authors":"Kazuki Furukawa , Masayuki Yamada , Kingo Ariyoshi","doi":"10.1016/j.electacta.2025.147998","DOIUrl":"10.1016/j.electacta.2025.147998","url":null,"abstract":"<div><div>Rechargeable all-solid-state batteries (ASSBs) offer promising advantages in terms of safety, energy density, and long cycle lifetime. Although an understanding of capacity degradation is crucial for accurately predicting the lifetimes of rechargeable batteries, theoretical kinetic studies evaluating capacity fading in ASS lithium-ion batteries (LIBs) have been relatively limited. In contrast to liquid-electrolyte-based LIBs, in which the mechanism of capacify fading due to state-of-charge (SOC) imbalance is relatively well understood, these phenomena are only beginning to be systematically elucidated in ASS-LIBs. This study addressed this gap by investigating the fundamental relationship between the SOC imbalance and rate of side reactions in a Li[Li<sub>1/3</sub>Ti<sub>5/3</sub>]O<sub>4</sub>/LiCoO<sub>2</sub> ASSB with a three-electrode cell configuration during repeated cycling at different temperatures. The obtained cumulative capacity plots facilitated quantification of the rates of side reactions at the electrodes using the side-reaction current (<em>I</em><sub>SR</sub>), which exhibited Arrhenius-type temperature dependence. Capacity fading in the ASSB was determined to be governed by the SOC imbalance, and a theoretical model linking this imbalance to the <em>I</em><sub>SR</sub> values at the electrodes was established accordingly. The resulting equation enabled the accurate prediction of battery lifetime based on <em>I</em><sub>SR</sub> and indicated an excellent lifetime for the evaluated ASSB, even at elevated temperatures. Thus, this study not only revealed the capacity fading mechanism in the ASS-LIB but also demonstrated a new theoretical framework for predicting its long-term performance, contributing to the design of more durable and reliable ASSBs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"549 ","pages":"Article 147998"},"PeriodicalIF":5.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145728685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.electacta.2025.147982
Hong Chen, Long Jia, Shiqi Ren, Jianmin Hao
Nickel–titanium (NiTi) alloys are widely used as orthopedic implants because of their excellent shape memory effect; however, their inadequate corrosion resistance, nickel ion release, and limited bioactivity still hinder further clinical application. In this study, micro-arc oxidation (MAO) was employed to construct oxide coatings on NiTi alloy substrates, taking the concentration of calcium acetate in the electrolyte (0–3 g/L) as the key process variable. The effects of calcium acetate concentration on the coating microstructure, mechanical properties, corrosion resistance, and in vitro mineralization behavior were systematically investigated. The results demonstrate that changes in calcium acetate concentration markedly affect the discharge characteristics and film-forming quality, among which the coating prepared at 2 g/L (denoted as X2) exhibits the most favorable overall performance. Specifically, compared with the calcium-acetate-free control, the coating thickness of the X2 sample increases from 18.36 μm to 22.44 μm (a 22.2% increase), while the average pore size and surface porosity decrease by 29.8% and 26.6%, respectively, indicating a significantly improved coating compactness. This structural densification translates into superior mechanical performance and protective capability: the microhardness of the X2 sample reaches 370.2 HV (approximately 6.9% higher than that of the control), and the interfacial bonding strength increases to 20.34 N (an improvement of about 33.2%). Meanwhile, the corrosion resistance is substantially enhanced, as evidenced by a 53.8% reduction in corrosion current density to 5.96 × 10⁻⁸ A/cm² and an approximately 3.5-fold increase in polarization resistance. After immersion in Hanks’ solution for 14 days, the cumulative release of Ni ions from X2 is reduced by 44.4% compared with the control, with a concentration of only 20 μg/L. In addition, Ca incorporation promotes the in situ formation of a β-Ca₃(PO₄)₂ phase within the coating; in particular, the 2 g/L group can induce the formation of a continuous reticulated hydroxyapatite (HA) layer during in vitro immersion, exhibiting the best mineralization capability among all samples. These findings indicate that rational regulation of calcium acetate concentration enables the synergistic enhancement of mechanical stability, physical barrier function, and bioactivity of MAO coatings, thereby providing optimized process parameters for the surface modification of NiTi implants.
{"title":"Effect of calcium acetate concentration in the electrolyte on the microstructure, anti-corrosion performance, and in vitro bioactivity of micro-arc oxidation coatings on NiTi","authors":"Hong Chen, Long Jia, Shiqi Ren, Jianmin Hao","doi":"10.1016/j.electacta.2025.147982","DOIUrl":"https://doi.org/10.1016/j.electacta.2025.147982","url":null,"abstract":"Nickel–titanium (NiTi) alloys are widely used as orthopedic implants because of their excellent shape memory effect; however, their inadequate corrosion resistance, nickel ion release, and limited bioactivity still hinder further clinical application. In this study, micro-arc oxidation (MAO) was employed to construct oxide coatings on NiTi alloy substrates, taking the concentration of calcium acetate in the electrolyte (0–3 g/L) as the key process variable. The effects of calcium acetate concentration on the coating microstructure, mechanical properties, corrosion resistance, and in vitro mineralization behavior were systematically investigated. The results demonstrate that changes in calcium acetate concentration markedly affect the discharge characteristics and film-forming quality, among which the coating prepared at 2 g/L (denoted as X2) exhibits the most favorable overall performance. Specifically, compared with the calcium-acetate-free control, the coating thickness of the X2 sample increases from 18.36 μm to 22.44 μm (a 22.2% increase), while the average pore size and surface porosity decrease by 29.8% and 26.6%, respectively, indicating a significantly improved coating compactness. This structural densification translates into superior mechanical performance and protective capability: the microhardness of the X2 sample reaches 370.2 HV (approximately 6.9% higher than that of the control), and the interfacial bonding strength increases to 20.34 N (an improvement of about 33.2%). Meanwhile, the corrosion resistance is substantially enhanced, as evidenced by a 53.8% reduction in corrosion current density to 5.96 × 10⁻⁸ A/cm² and an approximately 3.5-fold increase in polarization resistance. After immersion in Hanks’ solution for 14 days, the cumulative release of Ni ions from X2 is reduced by 44.4% compared with the control, with a concentration of only 20 μg/L. In addition, Ca incorporation promotes the in situ formation of a β-Ca₃(PO₄)₂ phase within the coating; in particular, the 2 g/L group can induce the formation of a continuous reticulated hydroxyapatite (HA) layer during in vitro immersion, exhibiting the best mineralization capability among all samples. These findings indicate that rational regulation of calcium acetate concentration enables the synergistic enhancement of mechanical stability, physical barrier function, and bioactivity of MAO coatings, thereby providing optimized process parameters for the surface modification of NiTi implants.","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"38 1","pages":""},"PeriodicalIF":6.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145728686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To address water scarcity and heavy metal pollution, capacitive deionization (CDI) has emerged as a key solution. This study developed a layered composite loaded with molybdenum disulfide/polypyrrole (MoS2/PPy) nanoparticles for efficient CDI removal of Pb2+ from water. MoS2 was synthesized via a hydrothermal method, followed by in-situ chemical polymerization to uniformly load PPy onto the surface and interlayers of MoS2, constructing a layered MoS2/PPy composite with nanoparticle-loading characteristics. The incorporation of PPy increases the interlayer spacing of MoS2 and enhances its specific surface area, providing ample intercalation space and active sites for Pb2+ adsorption. Electrochemical testing reveals that MoS2/PPy exhibits a specific capacitance of 101.7 F g−1 at a current density of 1 A g−1, demonstrating superior charge transfer and ion diffusion properties compared to pure MoS2. Second, under conditions of 1.2 V, initial Pb2+ concentration of 100 mg L−1, and pH=5, its CDI adsorption capacity reached 206.4 mg g−1. After 25 adsorption/desorption cycles, it retained 32.9 mg g−1 adsorption capacity and 53.5 % removal efficiency, demonstrating excellent regenerability and cycling stability. This provides practical guidance for efficiently treating Pb2+ contamination in real wastewater.
为了解决水资源短缺和重金属污染问题,电容去离子技术(CDI)已成为一个重要的解决方案。本研究开发了一种负载二硫化钼/聚吡咯(MoS2/PPy)纳米颗粒的层状复合材料,用于高效去除水中的Pb2+。采用水热合成法合成MoS2,然后通过原位化学聚合将PPy均匀加载到MoS2的表面和层间,构建了具有纳米颗粒加载特性的层状MoS2/PPy复合材料。PPy的掺入增加了MoS2的层间间距,提高了其比表面积,为Pb2+吸附提供了充足的插层空间和活性位点。电化学测试表明,MoS2/PPy在电流密度为1 a g−1时的比电容为101.7 F g−1,与纯MoS2相比,具有更好的电荷转移和离子扩散性能。其次,在1.2 V、初始Pb2+浓度为100 mg L−1、pH=5的条件下,其CDI吸附量达到206.4 mg g−1。经过25次吸附/解吸循环后,其吸附量为32.9 mg g−1,去除率为53.5%,具有良好的可再生性和循环稳定性。这对实际废水中Pb2+污染的有效处理具有实际指导意义。
{"title":"Enhanced capacitive deionization performance for Pb2+ removal using layered composite MoS2/PPy loaded with nanoparticles","authors":"Zhuannian Liu, Yifei Wang, Xiaolei Shi, Benlong Wei, Pudi Yang, Jilun Hu","doi":"10.1016/j.electacta.2025.147995","DOIUrl":"10.1016/j.electacta.2025.147995","url":null,"abstract":"<div><div>To address water scarcity and heavy metal pollution, capacitive deionization (CDI) has emerged as a key solution. This study developed a layered composite loaded with molybdenum disulfide/polypyrrole (MoS<sub>2</sub>/PPy) nanoparticles for efficient CDI removal of Pb<sup>2+</sup> from water. MoS<sub>2</sub> was synthesized via a hydrothermal method, followed by in-situ chemical polymerization to uniformly load PPy onto the surface and interlayers of MoS<sub>2</sub>, constructing a layered MoS<sub>2</sub>/PPy composite with nanoparticle-loading characteristics. The incorporation of PPy increases the interlayer spacing of MoS<sub>2</sub> and enhances its specific surface area, providing ample intercalation space and active sites for Pb<sup>2+</sup> adsorption. Electrochemical testing reveals that MoS<sub>2</sub>/PPy exhibits a specific capacitance of 101.7 F <em>g</em><sup>−1</sup> at a current density of 1 A <em>g</em><sup>−1</sup>, demonstrating superior charge transfer and ion diffusion properties compared to pure MoS<sub>2</sub>. Second, under conditions of 1.2 V, initial Pb<sup>2+</sup> concentration of 100 mg <em>L</em><sup>−1</sup>, and pH=5, its CDI adsorption capacity reached 206.4 mg <em>g</em><sup>−1</sup>. After 25 adsorption/desorption cycles, it retained 32.9 mg <em>g</em><sup>−1</sup> adsorption capacity and 53.5 % removal efficiency, demonstrating excellent regenerability and cycling stability. This provides practical guidance for efficiently treating Pb<sup>2+</sup> contamination in real wastewater.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"548 ","pages":"Article 147995"},"PeriodicalIF":5.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.electacta.2025.147996
Xingwei Tao, Xia Qin, Xujie Lan, Hongyun Ren, Mai Wang, Xiao Guo, Shan Wang
Electrochemical in situ generation of hydrogen peroxide (H2O2) via the two-electron oxygen reduction reaction (2e- ORR) is a promising green H2O2 supply strategy. However, developing high-performance cathodes that enable efficient O2 utilization and H2O2 production remains a challenge. In this study, a self-breathing cathode was constructed by modifying graphite felt (GF) with carbon nanotubes (CNTs), serving as the electrode for in situ H2O2 production. The pore architecture and surface hydrophobicity were finely tuned by adjusting the CNTs dimensions and optimizing PTFE content, thus significantly enhancing O2 transport and 2e- ORR kinetics. The optimized CNT2-GF cathode achieved a H2O2 concentration of 781.55 mg·L-1 within 60 min and maintained stable H2O2 production over 10 reuse cycles. Moreover, the in situ generated H2O2, in synergy with Fe2+, effectively degraded phenol, rhodamine B, tetracycline, and sulfanilamide, demonstrating strong potential for wastewater treatment. This study provides a deeper understanding of the structure-performance relationship of porous cathodes and presents a practical strategy for optimizing in situ H2O2 generation in electro-Fenton systems.
{"title":"Pore structure engineering of self-breathing cathodes for enhanced in situ H2O2 production via the 2e- oxygen reduction pathway","authors":"Xingwei Tao, Xia Qin, Xujie Lan, Hongyun Ren, Mai Wang, Xiao Guo, Shan Wang","doi":"10.1016/j.electacta.2025.147996","DOIUrl":"10.1016/j.electacta.2025.147996","url":null,"abstract":"<div><div>Electrochemical in situ generation of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) via the two-electron oxygen reduction reaction (2e<sup>-</sup> ORR) is a promising green H<sub>2</sub>O<sub>2</sub> supply strategy. However, developing high-performance cathodes that enable efficient O<sub>2</sub> utilization and H<sub>2</sub>O<sub>2</sub> production remains a challenge. In this study, a self-breathing cathode was constructed by modifying graphite felt (GF) with carbon nanotubes (CNTs), serving as the electrode for in situ H<sub>2</sub>O<sub>2</sub> production. The pore architecture and surface hydrophobicity were finely tuned by adjusting the CNTs dimensions and optimizing PTFE content, thus significantly enhancing O<sub>2</sub> transport and 2e<sup>-</sup> ORR kinetics. The optimized CNT<sub>2</sub>-GF cathode achieved a H<sub>2</sub>O<sub>2</sub> concentration of 781.55 mg·L<sup>-1</sup> within 60 min and maintained stable H<sub>2</sub>O<sub>2</sub> production over 10 reuse cycles. Moreover, the in situ generated H<sub>2</sub>O<sub>2</sub>, in synergy with Fe<sup>2+</sup>, effectively degraded phenol, rhodamine B, tetracycline, and sulfanilamide, demonstrating strong potential for wastewater treatment. This study provides a deeper understanding of the structure-performance relationship of porous cathodes and presents a practical strategy for optimizing in situ H<sub>2</sub>O<sub>2</sub> generation in electro-Fenton systems.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"548 ","pages":"Article 147996"},"PeriodicalIF":5.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.electacta.2025.147991
Xavier Majnoni d'Intignano , Olivier Devos , Mohamed El May , Sébastien Mercier , Nicolas Saintier , Bernard Tribollet
Passive film formation of wrought and laser powder bed fusion (LPBF) 316L with different heat treatments was investigated. The passive films of the samples were formed after electrochemical passivation in a chloride acidic solution. The electrochemical passivation was monitored thanks to an original approach by electrochemical impedance spectroscopy (EIS). This electrochemical monitoring allows following the formation of the passive layer. Electrochemical results show significant differences between the wrought and LPBF 316L regarding the electrical properties of the metal/electrolyte interface.
{"title":"Characterisation of the growth of the oxide layer on wrought and LPBF 316L stainless steels by electrochemical impedance spectroscopy measurements","authors":"Xavier Majnoni d'Intignano , Olivier Devos , Mohamed El May , Sébastien Mercier , Nicolas Saintier , Bernard Tribollet","doi":"10.1016/j.electacta.2025.147991","DOIUrl":"10.1016/j.electacta.2025.147991","url":null,"abstract":"<div><div>Passive film formation of wrought and laser powder bed fusion (LPBF) 316L with different heat treatments was investigated. The passive films of the samples were formed after electrochemical passivation in a chloride acidic solution. The electrochemical passivation was monitored thanks to an original approach by electrochemical impedance spectroscopy (EIS). This electrochemical monitoring allows following the formation of the passive layer. Electrochemical results show significant differences between the wrought and LPBF 316L regarding the electrical properties of the metal/electrolyte interface.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"549 ","pages":"Article 147991"},"PeriodicalIF":5.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-09DOI: 10.1016/j.electacta.2025.147993
Xuhai Pan , Tianwei Huang , Zhixiang Chen , Yahong Liu , Hao Shen , Min Hua
With the growing demand for new energy sources, lithium batteries have attracted much attention due to their many excellent characteristics. However, lithium dendrite is an undesirable phenomenon in the cycling process of lithium-ion batteries, which can have a serious impact on battery safety and cycle life. The lithium dendrite problem is a pressing issue that hinders the development of lithium metal battery applications. In this work, a new binary electrolyte system, PILs-Es, was constructed using [BMP]TFSI ionic liquids intermixed with carbonate-based organic solvents. The optimal solvent ratios were selected by analyzing the ionic conductivity and viscosity studies. It is demonstrated that the PILs-E30-based half-cell exhibits excellent cycling stability and lower charge transfer impedance, which plays a positive role in the formation of a more homogeneous and dense solid electrolyte interfacial film (SEI film) on the surface of the anode. [BMP]TFSI is involved in the film-forming process, forming a more stable SEI film product, slowing down the decomposition of carbonate organic solvents, and inhibiting the occurrence of side reactions between the electrolyte and the electrode surface.PILs-E30 produces a more homogeneous deposition of lithium, which makes the generated SEI film more homogeneous and dense, and inhibits the generation of lithium dendrites, thus protecting the anode material. The LiFePO4|Graphite full cell based on PILs-E30 exhibits excellent electrochemical performance, with a discharge specific capacity of 117.5 mAh g-1, a high capacity retention of 95.0 %, and a Coulombic efficiency of close to 100 % after cycling for 200 cycles at 1 C multiplication rate. This proves the usefulness of PILs-E30 in full batteries.
随着人们对新能源需求的不断增长,锂电池因其诸多优异的特性而备受关注。然而,锂枝晶是锂离子电池循环过程中的不良现象,会对电池的安全性和循环寿命产生严重影响。锂枝晶问题是阻碍锂金属电池应用发展的一个紧迫问题。在这项工作中,用[BMP]TFSI离子液体与碳酸盐基有机溶剂混合构建了一种新的二元电解质体系PILs-Es。通过对离子电导率和粘度的分析,确定了最佳溶剂配比。结果表明,基于pils - e30的半电池具有良好的循环稳定性和较低的电荷转移阻抗,这对在阳极表面形成更均匀、致密的固体电解质界面膜(SEI膜)起着积极的作用。[BMP]TFSI参与成膜过程,形成更稳定的SEI膜产物,减缓碳酸盐有机溶剂的分解,抑制电解质与电极表面副反应的发生。PILs-E30使锂的沉积更加均匀,使生成的SEI膜更加均匀致密,抑制了锂枝晶的生成,从而保护了负极材料。基于PILs-E30的LiFePO4|石墨电池表现出优异的电化学性能,放电比容量为117.5 mAh g-1,容量保持率高达95.0%,在1c倍率下循环200次后库仑效率接近100%。这证明了PILs-E30在充满电的电池中的实用性。
{"title":"PILs-E ionic liquids enable stable interfacial membranes for high performance and dendrite-free lithium metal batteries","authors":"Xuhai Pan , Tianwei Huang , Zhixiang Chen , Yahong Liu , Hao Shen , Min Hua","doi":"10.1016/j.electacta.2025.147993","DOIUrl":"10.1016/j.electacta.2025.147993","url":null,"abstract":"<div><div>With the growing demand for new energy sources, lithium batteries have attracted much attention due to their many excellent characteristics. However, lithium dendrite is an undesirable phenomenon in the cycling process of lithium-ion batteries, which can have a serious impact on battery safety and cycle life. The lithium dendrite problem is a pressing issue that hinders the development of lithium metal battery applications. In this work, a new binary electrolyte system, PILs-Es, was constructed using [BMP]TFSI ionic liquids intermixed with carbonate-based organic solvents. The optimal solvent ratios were selected by analyzing the ionic conductivity and viscosity studies. It is demonstrated that the PILs-E30-based half-cell exhibits excellent cycling stability and lower charge transfer impedance, which plays a positive role in the formation of a more homogeneous and dense solid electrolyte interfacial film (SEI film) on the surface of the anode. [BMP]TFSI is involved in the film-forming process, forming a more stable SEI film product, slowing down the decomposition of carbonate organic solvents, and inhibiting the occurrence of side reactions between the electrolyte and the electrode surface.PILs-E30 produces a more homogeneous deposition of lithium, which makes the generated SEI film more homogeneous and dense, and inhibits the generation of lithium dendrites, thus protecting the anode material. The LiFePO<sub>4</sub>|Graphite full cell based on PILs-E30 exhibits excellent electrochemical performance, with a discharge specific capacity of 117.5 mAh g<sup>-1</sup>, a high capacity retention of 95.0 %, and a Coulombic efficiency of close to 100 % after cycling for 200 cycles at 1 C multiplication rate. This proves the usefulness of PILs-E30 in full batteries.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"548 ","pages":"Article 147993"},"PeriodicalIF":5.6,"publicationDate":"2025-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-08DOI: 10.1016/j.electacta.2025.147981
Min Qin , Jialin Li , Xiyu Wang , Na Yang , Shijian Zhang , Guoxi He , Long Qin , Kexi Liao
Wet gas pipelines in oil and gas transportation are subjected to complex corrosive environments involving corrosive gases and multiphase flow. CO2 corrosion mechanisms differ fundamentally between environments, requiring dedicated study of gas environment pipeline top corrosion. This study systematically investigates the synergistic effects of CO2, Cl-, flow velocity, temperature, and pH on the corrosion of X65 steel in both environments. Through high-temperature, high-pressure reactor experiments combined with SEM, EDS, and XRD analysis, we reveal that the varying degrees of crystallization of FeCO3 at different temperatures and corrosion environments result in differences in the density of the corrosion product film, which further induces different degrees of localized corrosion. In the liquid environment, the synergistic action of Cl- penetration and fluid shear promotes localized corrosion, with a maximum rate of 4.16 mm/a. Notably, the maximum pit depth increases dramatically to 78.4852 μm. In contrast, the gas environment exhibits lower corrosion rates (up to 2.46 mm/a) and a maximum pit depth of 46.2978 μm (only 59 % of that in the liquid environment), attributed to denser and more crystalline FeCO3 films formed under condensate droplets.A key mechanistic insight is the identification of distinct corrosion-sensitive factors in each environment: CO2 partial pressure and Cl- concentration dominate in the liquid environment, whereas CO2 partial pressure and temperature are controlling in the gas environment. The synergistic corrosion effect of CO2 with temperature, pH, velocity and Cl- were explained. Ultimately, under the erosion of flowing and the infiltration of Cl-, combined with the evolution characteristics of corrosion product film, the synergistic corrosion behavior of CO2 and four factors was revealed.
油气输送中的湿式输气管道处于复杂的腐蚀环境中,涉及腐蚀性气体和多相流。二氧化碳和…
{"title":"Unraveling the synergistic effect of CO2, Cl-, flow, temperature and pH on X65 steel corrosion in gas and liquid environments","authors":"Min Qin , Jialin Li , Xiyu Wang , Na Yang , Shijian Zhang , Guoxi He , Long Qin , Kexi Liao","doi":"10.1016/j.electacta.2025.147981","DOIUrl":"10.1016/j.electacta.2025.147981","url":null,"abstract":"<div><div>Wet gas pipelines in oil and gas transportation are subjected to complex corrosive environments involving corrosive gases and multiphase flow. CO<sub>2</sub> corrosion mechanisms differ fundamentally between environments, requiring dedicated study of gas environment pipeline top corrosion. This study systematically investigates the synergistic effects of CO<sub>2</sub>, Cl<sup>-</sup>, flow velocity, temperature, and pH on the corrosion of X65 steel in both environments. Through high-temperature, high-pressure reactor experiments combined with SEM, EDS, and XRD analysis, we reveal that the varying degrees of crystallization of FeCO<sub>3</sub> at different temperatures and corrosion environments result in differences in the density of the corrosion product film, which further induces different degrees of localized corrosion. In the liquid environment, the synergistic action of Cl<sup>-</sup> penetration and fluid shear promotes localized corrosion, with a maximum rate of 4.16 mm/a. Notably, the maximum pit depth increases dramatically to 78.4852 μm. In contrast, the gas environment exhibits lower corrosion rates (up to 2.46 mm/a) and a maximum pit depth of 46.2978 μm (only 59 % of that in the liquid environment), attributed to denser and more crystalline FeCO<sub>3</sub> films formed under condensate droplets.A key mechanistic insight is the identification of distinct corrosion-sensitive factors in each environment: CO<sub>2</sub> partial pressure and Cl<sup>-</sup> concentration dominate in the liquid environment, whereas CO<sub>2</sub> partial pressure and temperature are controlling in the gas environment. The synergistic corrosion effect of CO<sub>2</sub> with temperature, pH, velocity and Cl<sup>-</sup> were explained. Ultimately, under the erosion of flowing and the infiltration of Cl<sup>-</sup>, combined with the evolution characteristics of corrosion product film, the synergistic corrosion behavior of CO<sub>2</sub> and four factors was revealed.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"548 ","pages":"Article 147981"},"PeriodicalIF":5.6,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145704545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-08DOI: 10.1016/j.electacta.2025.147980
Liteng Fan , Wan Wan , Weiyan Ma , Yaxuan Jin , Dejun Gong , Yuling Tu , Dong Sun , Wanyong Zhou , Hui Chai , Xiaogang Zhang
Molybdenum disulfide (MoS2) has emerged as a promising cathode material for aqueous zinc-ion batteries (AZIBs) due to its unique layered structure, high specific surface area, and cost-effectiveness. In this work, MoS2 was modified with N, N-dimethylformamide (DMF) to form a nanocomposite. The DMF intercalation successfully expanded the interlayer spacing of MoS2 from 0.62 nm to 0.99 nm. This expansion effectively reduces Coulombic interactions at the hydrated Zn2+/MoS2 interface, which promotes structural destabilization and facilitates accelerated zinc-ion diffusion. Consequently, the as-prepared MoS2-DMF cathode delivers a remarkable discharge specific capacity of 181.9 mAh g−1 at 0.1 A g−1 and demonstrates outstanding long-term cyclability with a capacity retention of 78.7% after 1000 cycles at a high current density of 5 A g−1. The strategy presented herein provides a valuable pathway for developing high-performance cathode materials for advanced AZIBs.
二硫化钼(MoS2)由于其独特的层状结构、高比表面积和成本效益而成为一种很有前途的水性锌离子电池(AZIBs)正极材料。在这项工作中,用N, N-二甲基甲酰胺(DMF)修饰二硫化钼形成纳米复合材料。DMF的插入成功地将MoS2的层间距从0.62 nm扩大到0.99 nm。这种膨胀有效地降低了水合Zn2+/MoS2界面上的库仑相互作用,促进了结构的不稳定,促进了锌离子的加速扩散。因此,制备的MoS2-DMF阴极在0.1 a g−1下具有181.9 mAh g−1的显著放电比容量,并且在5 a g−1的高电流密度下,在1000次循环后具有78.7%的长期可循环性。本文提出的策略为开发高性能azib正极材料提供了一条有价值的途径。
{"title":"Constructing 3D hierarchical MoS2 architectures via DMF intercalation: Vertically stacked nanosheets enable enhanced zinc-ion storage performance","authors":"Liteng Fan , Wan Wan , Weiyan Ma , Yaxuan Jin , Dejun Gong , Yuling Tu , Dong Sun , Wanyong Zhou , Hui Chai , Xiaogang Zhang","doi":"10.1016/j.electacta.2025.147980","DOIUrl":"10.1016/j.electacta.2025.147980","url":null,"abstract":"<div><div>Molybdenum disulfide (MoS<sub>2</sub>) has emerged as a promising cathode material for aqueous zinc-ion batteries (AZIBs) due to its unique layered structure, high specific surface area, and cost-effectiveness. In this work, MoS<sub>2</sub> was modified with N, N-dimethylformamide (DMF) to form a nanocomposite. The DMF intercalation successfully expanded the interlayer spacing of MoS<sub>2</sub> from 0.62 nm to 0.99 nm. This expansion effectively reduces Coulombic interactions at the hydrated Zn<sup>2+</sup>/MoS<sub>2</sub> interface, which promotes structural destabilization and facilitates accelerated zinc-ion diffusion. Consequently, the as-prepared MoS<sub>2</sub>-DMF cathode delivers a remarkable discharge specific capacity of 181.9 mAh g<sup>−1</sup> at 0.1 A g<sup>−1</sup> and demonstrates outstanding long-term cyclability with a capacity retention of 78.7% after 1000 cycles at a high current density of 5 A g<sup>−1</sup>. The strategy presented herein provides a valuable pathway for developing high-performance cathode materials for advanced AZIBs.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"548 ","pages":"Article 147980"},"PeriodicalIF":5.6,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145711332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-08DOI: 10.1016/j.electacta.2025.147975
Si Lin Choon , Hong Ngee Lim , Wan Nadhirah Wan Mohd Abd Kalam , Izwaharyanie Ibrahim , Chi Huey Ng , Choon Yian Haw , Augustin Catalin Mot , Lucian Cristian Pop
Rapid synthesis of Cs2SnI6 is established by reacting the pre-prepared CsI and SnI4 via a mechanochemical approach, in which the reaction is stably conducted in a facile condition for 12 min with the incorporation of hydroiodic acid (HI). The Rietveld refinement analysis reveals that the synthesized Cs2SnI6 exhibits stable crystallinity for over 4 months under ambient conditions with a relative humidity of more than 70%, showing no significant changes in its purity. When incorporated into dye-sensitized solar cells (DSSCs), Cs2SnI6 exhibits a 32% enhancement in power conversion efficiency compared to the control, which is attributed to its superior light absorption and the matched energy levels of the device. The improved performance of DSSC employed with Cs2SnI6 is integrated with a supercapacitor and capable of photo-charging the device with a discharged specific capacitance of 92.12 F g-1 at 1 A g-1. The Cs2SnI6 DSSC-supercapacitor demonstrates twice the stability of the pristine device, with a retention rate of 81.27% under 1-sun illumination and a ≥ 60% stability improvement under halogen lamp illumination after 30 cycles, even without encapsulation. This study demonstrates, for the first time, the feasibility of Cs2SnI6 under visible light, highlighting its potential for future indoor energy applications.
通过机械化学的方法,将预先制备好的CsI和SnI4进行反应,并加入氢碘酸(HI),在简易条件下稳定反应12 min,建立了Cs2SnI6的快速合成方法。Rietveld细化分析表明,合成的Cs2SnI6在相对湿度大于70%的环境条件下,结晶度稳定4个月以上,纯度无明显变化。当加入到染料敏化太阳能电池(DSSCs)中时,Cs2SnI6的功率转换效率比对照提高了32%,这归因于其优越的光吸收能力和器件的匹配能级。采用Cs2SnI6的DSSC性能得到了改善,并集成了一个超级电容器,能够在1 a g-1下以92.12 F -1的放电比电容对器件进行光充电。Cs2SnI6 dssc超级电容器的稳定性是原始器件的两倍,在1个太阳照射下保持率为81.27%,在卤素灯照射30次后稳定性提高≥60%,即使没有封装。该研究首次证明了Cs2SnI6在可见光下的可行性,突出了其未来室内能源应用的潜力。
{"title":"Rapid synthesis of stable Cs2SnI6 double perovskite for visible-light DSSC–supercapacitor applications","authors":"Si Lin Choon , Hong Ngee Lim , Wan Nadhirah Wan Mohd Abd Kalam , Izwaharyanie Ibrahim , Chi Huey Ng , Choon Yian Haw , Augustin Catalin Mot , Lucian Cristian Pop","doi":"10.1016/j.electacta.2025.147975","DOIUrl":"10.1016/j.electacta.2025.147975","url":null,"abstract":"<div><div>Rapid synthesis of Cs<sub>2</sub>SnI<sub>6</sub> is established by reacting the pre-prepared CsI and SnI<sub>4</sub> via a mechanochemical approach, in which the reaction is stably conducted in a facile condition for 12 min with the incorporation of hydroiodic acid (HI). The Rietveld refinement analysis reveals that the synthesized Cs<sub>2</sub>SnI<sub>6</sub> exhibits stable crystallinity for over 4 months under ambient conditions with a relative humidity of more than 70%, showing no significant changes in its purity. When incorporated into dye-sensitized solar cells (DSSCs), Cs<sub>2</sub>SnI<sub>6</sub> exhibits a 32% enhancement in power conversion efficiency compared to the control, which is attributed to its superior light absorption and the matched energy levels of the device. The improved performance of DSSC employed with Cs<sub>2</sub>SnI<sub>6</sub> is integrated with a supercapacitor and capable of photo-charging the device with a discharged specific capacitance of 92.12 F g<sup>-1</sup> at 1 A g<sup>-1</sup>. The Cs<sub>2</sub>SnI<sub>6</sub> DSSC-supercapacitor demonstrates twice the stability of the pristine device, with a retention rate of 81.27% under 1-sun illumination and <em>a</em> ≥ 60% stability improvement under halogen lamp illumination after 30 cycles, even without encapsulation. This study demonstrates, for the first time, the feasibility of Cs<sub>2</sub>SnI<sub>6</sub> under visible light, highlighting its potential for future indoor energy applications.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"548 ","pages":"Article 147975"},"PeriodicalIF":5.6,"publicationDate":"2025-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145697319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}