Journal of Electroanalytical Chemistry最新文献_第6页

Chemometrically optimized electrochemical decoupling of the uric acid–xanthine purine pair via single-step co-synthesized composite 单步共合成复合材料对尿酸-黄嘌呤-嘌呤的电化学解耦进行了化学计量学优化

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-06 DOI: 10.1016/j.jelechem.2026.119801

Nguyen Minh Quang , Do Mai Nguyen , Vo Chau Ngoc Anh , Tran Thanh Tam Toan , Anh-Quang Dao

An electrochemical sensor was developed with a modified glassy carbon electrode (GCE) by a poly(bromocresol purple) (PBSP) and electrochemically reduced graphene oxide (RGO) composite. The modified electrode was prepared via a single-step electrochemical co-deposition technique, which represents a methodological refinement aimed at enhancing the simplicity and structural integration of the components. The resulting PBSP-RGO/GCE-modified electrode was evaluated for the dual electrochemical detection of uric acid (URC) and xanthine (XAT). An analytical improvement was achieved as the oxidation electrochemical signals of these two urinary metabolites were clearly resolved, reducing the problem of signal overlap commonly encountered in conventional sensing platforms. The observed enhancement in electrochemical activity is due to the combination of the high electrical conductivity of the RGO support and the functional selectivity imparted by the PBSP polymer layer. The sensor demonstrated good sensitivity and low limits of detection (LODs) for both analytes, with URC being reliably determined in a wide linear concentration range. Furthermore, the actual sample investigation of the technique was indicated through the analysis of real biological matrices (urine), where recovery rates ranging from 96 % to 105 % were consistently documented. The findings were statistically confirmed to be in comparison with the standard high-performance liquid chromatography (HPLC) technique, establishing the accuracy and reliability of the proposed sensor.

采用聚溴甲酚紫（PBSP）和电化学还原氧化石墨烯（RGO）复合材料修饰玻碳电极（GCE），研制了一种电化学传感器。修饰电极是通过一步电化学共沉积技术制备的，这代表了一种方法的改进，旨在提高组件的简单性和结构集成度。采用PBSP-RGO/ gce修饰电极对尿酸（URC）和黄嘌呤（XAT）进行双电化学检测。这两种尿液代谢物的氧化电化学信号得到了清晰的解析，从而实现了分析上的改进，减少了传统传感平台中常见的信号重叠问题。观察到的电化学活性的增强是由于RGO载体的高导电性和PBSP聚合物层赋予的功能选择性的结合。该传感器对两种分析物具有良好的灵敏度和较低的检测限（lod）， URC在较宽的线性浓度范围内可靠地测定。此外，该技术的实际样本调查是通过分析真正的生物基质（尿液）来表明的，其中回收率从96%到105%不等。统计结果与标准高效液相色谱（HPLC）技术进行了比较，建立了所提出传感器的准确性和可靠性。

{"title":"Chemometrically optimized electrochemical decoupling of the uric acid–xanthine purine pair via single-step co-synthesized composite","authors":"Nguyen Minh Quang , Do Mai Nguyen , Vo Chau Ngoc Anh , Tran Thanh Tam Toan , Anh-Quang Dao","doi":"10.1016/j.jelechem.2026.119801","DOIUrl":"10.1016/j.jelechem.2026.119801","url":null,"abstract":"<div><div>An electrochemical sensor was developed with a modified glassy carbon electrode (GCE) by a poly(bromocresol purple) (PBSP) and electrochemically reduced graphene oxide (RGO) composite. The modified electrode was prepared via a single-step electrochemical co-deposition technique, which represents a methodological refinement aimed at enhancing the simplicity and structural integration of the components. The resulting PBSP-RGO/GCE-modified electrode was evaluated for the dual electrochemical detection of uric acid (URC) and xanthine (XAT). An analytical improvement was achieved as the oxidation electrochemical signals of these two urinary metabolites were clearly resolved, reducing the problem of signal overlap commonly encountered in conventional sensing platforms. The observed enhancement in electrochemical activity is due to the combination of the high electrical conductivity of the RGO support and the functional selectivity imparted by the PBSP polymer layer. The sensor demonstrated good sensitivity and low limits of detection (LODs) for both analytes, with URC being reliably determined in a wide linear concentration range. Furthermore, the actual sample investigation of the technique was indicated through the analysis of real biological matrices (urine), where recovery rates ranging from 96 % to 105 % were consistently documented. The findings were statistically confirmed to be in comparison with the standard high-performance liquid chromatography (HPLC) technique, establishing the accuracy and reliability of the proposed sensor.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119801"},"PeriodicalIF":4.1,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of defect-rich metal-free carbon from coconut shell for catalyzing oxygen evolution reaction 椰壳制备富缺陷无金属碳催化析氧反应

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-06 DOI: 10.1016/j.jelechem.2026.119804

Yanmin Jian, Yucheng Chen, Yongjun Chen, Min Wang, Lijie Luo

Biomass-derived carbon materials represent stable, cost-effective and environmentally friendly electrocatalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). In this work, a self-supporting coconut shell carbon (SCC) catalyst featuring a three-dimensional (3D) hierarchical porous structure was reported by in situ ammonia etching. The SCC-1100-NH₃ exhibited outstanding OER performance, achieving a current density of 10 mA cm⁻² at an overpotential of 294 mV and a potential of 1.52 V vs RHE. The unique structural configuration also offered the catalyst excellent durability with stable operation for at least 98 h. It was believed that the hierarchical porous structure enhances electrical conductivity and the formation of vacancy-coupled pentagon defects which act as active sites. This work provides a new strategy for designing defect-rich metal-free biomass-derived carbon electrodes.

生物质源碳材料是一种稳定、经济、环保的析氧反应（OER）和析氢反应（HER）电催化剂。在这项工作中，报道了一种具有三维（3D）分层多孔结构的自支撑椰子壳碳（SCC）催化剂。SCC-1100-NH3表现出优异的OER性能，在过电位294 mV和过电位1.52 V vs RHE下，电流密度达到10 mA cm−2。独特的结构结构也为催化剂提供了优异的耐久性，稳定运行至少98小时。认为分层多孔结构提高了电导率，并形成了作为活性位点的空位耦合五边形缺陷。这项工作为设计富含缺陷的无金属生物质衍生碳电极提供了一种新的策略。

引用次数: 0

Research progress on doping modification of lithium-rich manganese-based layered oxide cathode materials 富锂锰基层状氧化物正极材料掺杂改性研究进展

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-06 DOI: 10.1016/j.jelechem.2026.119795

Yiqi Zheng , Yingjie Ji , Zhen Zhang , Yi Yao , Yi Zhang , Zhoulu Wang , Xiang Liu

With the development of society, lithium-ion batteries are facing higher demands for energy density from electric vehicles, consumer (3C) electronic products, energy storage devices, and other applications. Lithium-rich manganese-based cathode materials have advantages such as high specific capacity (≈ 250 mAh g⁻¹), high operating voltage (≈ 3.6 V), and low cost, making them promising candidates for the next generation of commercial high-specific-energy batteries. However, this material has many problems, such as lattice oxygen evolution, transition metal ion migration, low initial Coulombic efficiency, voltage and capacity fade, and interfacial side reactions, which limit its commercial application. This paper reviews the latest research progress on the doping of lithium-rich manganese-based cathode materials, focusing on aspects such as synthesis methods, reaction mechanisms, and electrochemical properties. Research shows that ion doping can significantly improve the electrochemical performance of lithium-rich manganese-based cathode materials. Finally, the doping directions of lithium-rich manganese-based cathode materials are prospected.

随着社会的发展，电动汽车、消费类（3C）电子产品、储能设备等应用对锂离子电池的能量密度提出了更高的要求。富锂锰基正极材料具有高比容量（≈250 mAh g−1）、高工作电压（≈3.6 V）和低成本等优点，是下一代商用高比能电池的理想候选者。然而，该材料存在晶格析氧、过渡金属离子迁移、初始库仑效率低、电压和容量衰减、界面副反应等问题，限制了其商业应用。本文综述了富锂锰基正极材料掺杂的最新研究进展，重点从合成方法、反应机理、电化学性能等方面进行了综述。研究表明，离子掺杂可以显著提高富锂锰基正极材料的电化学性能。最后对富锂锰基正极材料的掺杂方向进行了展望。

{"title":"Research progress on doping modification of lithium-rich manganese-based layered oxide cathode materials","authors":"Yiqi Zheng , Yingjie Ji , Zhen Zhang , Yi Yao , Yi Zhang , Zhoulu Wang , Xiang Liu","doi":"10.1016/j.jelechem.2026.119795","DOIUrl":"10.1016/j.jelechem.2026.119795","url":null,"abstract":"<div><div>With the development of society, lithium-ion batteries are facing higher demands for energy density from electric vehicles, consumer (3C) electronic products, energy storage devices, and other applications. Lithium-rich manganese-based cathode materials have advantages such as high specific capacity (≈ 250 mAh g<sup>−1</sup>), high operating voltage (≈ 3.6 V), and low cost, making them promising candidates for the next generation of commercial high-specific-energy batteries. However, this material has many problems, such as lattice oxygen evolution, transition metal ion migration, low initial Coulombic efficiency, voltage and capacity fade, and interfacial side reactions, which limit its commercial application. This paper reviews the latest research progress on the doping of lithium-rich manganese-based cathode materials, focusing on aspects such as synthesis methods, reaction mechanisms, and electrochemical properties. Research shows that ion doping can significantly improve the electrochemical performance of lithium-rich manganese-based cathode materials. Finally, the doping directions of lithium-rich manganese-based cathode materials are prospected.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119795"},"PeriodicalIF":4.1,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ce3+ doping modulates low-spin Fe active sites and sodium-ion diffusion kinetics to enhance Prussian blue cathode performance Ce3+掺杂调节低自旋铁活性位点和钠离子扩散动力学，提高普鲁士蓝阴极性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-05 DOI: 10.1016/j.jelechem.2026.119792

Binghong Li , Fuliang Zhu , Yanshuang Meng

Iron-based Prussian blue (FeHCF) have garnered significant attention as cathode materials for sodium-ion batteries due to their high theoretical capacity and open 3D framework. However, their practical performance is severely limited by the shielding of low-spin Fe (Fe^LS) active sites due to Fe(CN)₆ vacancies and crystalline water, as well as sluggish kinetics resulting from their semiconducting nature. This study proposes a cerium (Ce³⁺) doping strategy that significantly enhances the sodium storage performance of FeHCF through a dual mechanism of defect repair and electronic modulation. Experimental results demonstrate that Ce³⁺ doping not only fills [Fe(CN) ₆] vacancies and repels crystalline water, thereby reactivating the shielded Fe^LS active sites (increasing capacity contribution from 22.98 mAh g⁻¹ to 47.8 mAh g⁻¹), but also elevates the Fermi-level density of states via 4f-3d orbital hybridization, endowing the material with quasi-metallic characteristics. The optimized FeHCF-5 material delivers a reversible capacity of 120.6 mAh g⁻¹, maintains 88.5 mAh g⁻¹ at a high current density of 500 mA g⁻¹, and achieves a capacity retention of 80.4 % after 200 cycles. Combined with theoretical calculations, this work reveals that Ce³⁺ doping synergistically optimizes electron conduction and ion diffusion kinetics by reducing the sodium-ion diffusion energy barrier (from 0.356 eV to 0.19 eV) and widening ion transport channels (the Na⁺ diffusion coefficient increases by 14.14-fold to 5.373 × 10⁻⁹ cm² s⁻¹). This study provides new insights for designing high-performance sodium storage materials.

铁基普鲁士蓝（FeHCF）作为钠离子电池的正极材料，由于其高理论容量和开放的三维结构而备受关注。然而，由于Fe(CN)6空位和结晶水对低自旋Fe（FeLS）活性位点的屏蔽，以及半导体性质导致的缓慢动力学，它们的实际性能受到严重限制。本研究提出了一种铈（Ce3+）掺杂策略，通过缺陷修复和电子调制双重机制显著提高FeHCF的储钠性能。实验结果表明，Ce3+的掺杂不仅填补了[Fe(CN) 6]空位并排斥晶水，从而使屏蔽的FeLS活性位点重新激活（容量贡献从22.98 mAh g−1增加到47.8 mAh g−1），而且通过4f-3d轨道杂化提高了费米能级密度，赋予材料准金属特性。优化后的FeHCF-5材料的可逆容量为120.6 mAh g−1，在500 mA g−1的高电流密度下保持88.5 mAh g−1，在200次循环后容量保持率为80.4%。结合理论计算，Ce3+掺杂通过降低钠离子扩散能垒（从0.356 eV降低到0.19 eV）和扩大离子传输通道（Na+扩散系数增加14.14倍，达到5.373 × 10−9 cm2 s−1），协同优化了电子传导和离子扩散动力学。该研究为设计高性能钠存储材料提供了新的思路。

{"title":"Ce3+ doping modulates low-spin Fe active sites and sodium-ion diffusion kinetics to enhance Prussian blue cathode performance","authors":"Binghong Li , Fuliang Zhu , Yanshuang Meng","doi":"10.1016/j.jelechem.2026.119792","DOIUrl":"10.1016/j.jelechem.2026.119792","url":null,"abstract":"<div><div>Iron-based Prussian blue (FeHCF) have garnered significant attention as cathode materials for sodium-ion batteries due to their high theoretical capacity and open 3D framework. However, their practical performance is severely limited by the shielding of low-spin Fe (Fe<sup>LS</sup>) active sites due to Fe(CN)<sub>6</sub> vacancies and crystalline water, as well as sluggish kinetics resulting from their semiconducting nature. This study proposes a cerium (Ce<sup>3+</sup>) doping strategy that significantly enhances the sodium storage performance of FeHCF through a dual mechanism of defect repair and electronic modulation. Experimental results demonstrate that Ce<sup>3+</sup> doping not only fills [Fe(CN) <sub>6</sub>] vacancies and repels crystalline water, thereby reactivating the shielded Fe<sup>LS</sup> active sites (increasing capacity contribution from 22.98 mAh g<sup>−1</sup> to 47.8 mAh g<sup>−1</sup>), but also elevates the Fermi-level density of states via 4f-3d orbital hybridization, endowing the material with quasi-metallic characteristics. The optimized FeHCF-5 material delivers a reversible capacity of 120.6 mAh g<sup>−1</sup>, maintains 88.5 mAh g<sup>−1</sup> at a high current density of 500 mA g<sup>−1</sup>, and achieves a capacity retention of 80.4 % after 200 cycles. Combined with theoretical calculations, this work reveals that Ce<sup>3+</sup> doping synergistically optimizes electron conduction and ion diffusion kinetics by reducing the sodium-ion diffusion energy barrier (from 0.356 eV to 0.19 eV) and widening ion transport channels (the Na<sup>+</sup> diffusion coefficient increases by 14.14-fold to 5.373 × 10<sup>−9</sup> cm<sup>2</sup> s<sup>−1</sup>). This study provides new insights for designing high-performance sodium storage materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119792"},"PeriodicalIF":4.1,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ construction of Fe-Co-Ni alloy based ternary sulfide electrode towards alkaline overall water splitting 基于Fe-Co-Ni合金的碱性整体水分解三元硫化电极的原位构建

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-05 DOI: 10.1016/j.jelechem.2026.119802

YuWei Chen , QingWei Wang , LiXia Yang , Jun-e Qu

Compounds of iron, cobalt and nickel elements have demonstrated great potentials as substitutes to the noble metal catalysts for both hydrogen evolution(HER) and oxygen evolution(OER). The simultaneous joint application of the three elements can further improve catalytic activity. However there have been rarely reports on self-supporting Fe-Co-Ni ternary sulfide electrode towards water electrolysis. Herein, in this work, a novel in-situ-growing type bifunctional Fe-Co-Ni alloy based sulfide catalytic electrode for alkaline water splitting is synthesized by one-step hydrothermal sulfuration treatment in an sodium sulfide aqueous medium. The electrochemical characterization results show that among electrodes prepared from alloy substrate with altered Fe:Co:Ni atomic ratios, the as prepared Fe20Co40Ni40-S electrode (with atomic ration of Fe:Co:Ni = 2:4:4) shows the best catalytic performance, achieving low overpotentials of 196 and 261 mV corresponding to the current density of 10 mA·cm⁻² towards OER and HER process in 1 M KOH electrolyte, respectively. It only needs cell voltage of 1.64 V for Fe20Co40Ni40-S to realize fully hydrolyzing water at 10 mA·cm⁻². These features including high nickel content and high S²⁻/SO₄²⁻ ratio in surface elements, great specific surface area, catalyst species in multiple valence states, Ni₃S₄/(Fe,Co,Ni)₉S₈ heterojunction structures, superhydrophilic property, and strong bonding force between matrix and interface are the reasons for the excellent bifunctional catalytic activity of the Fe20Co40Ni40-S electrode.

铁、钴和镍元素的化合物作为贵金属析氢（HER）和析氧（OER）催化剂的替代品显示出巨大的潜力。三种元素同时联合应用可进一步提高催化活性。然而，自支撑的Fe-Co-Ni三元硫化电极用于水电解的报道很少。本文在硫化钠水介质中，采用一步水热硫化法合成了一种新型的原位生长型双功能Fe-Co-Ni合金基硫化物催化裂化电极。电化学表征结果表明，在改变Fe:Co:Ni原子比的合金衬底上制备的电极中，Fe20Co40Ni40-S电极（Fe:Co:Ni = 2:4:4）表现出最好的催化性能，在1 M KOH电解液中，当电流密度为10 mA·cm−2时，对OER和HER过程的过电位分别为196和261 mV。Fe20Co40Ni40-S仅需1.64 V的电池电压即可在10 mA·cm−2下实现水的完全水解。表面元素中镍含量高、S2−/SO42−比高、比表面积大、催化剂种类多价态、Ni3S4/(Fe,Co,Ni)9S8异质结结构、超亲水性以及基体与界面之间的强结合力是Fe20Co40Ni40-S电极具有优异双功能催化活性的原因。

{"title":"In-situ construction of Fe-Co-Ni alloy based ternary sulfide electrode towards alkaline overall water splitting","authors":"YuWei Chen , QingWei Wang , LiXia Yang , Jun-e Qu","doi":"10.1016/j.jelechem.2026.119802","DOIUrl":"10.1016/j.jelechem.2026.119802","url":null,"abstract":"<div><div>Compounds of iron, cobalt and nickel elements have demonstrated great potentials as substitutes to the noble metal catalysts for both hydrogen evolution(HER) and oxygen evolution(OER). The simultaneous joint application of the three elements can further improve catalytic activity. However there have been rarely reports on self-supporting Fe-Co-Ni ternary sulfide electrode towards water electrolysis. Herein, in this work, a novel in-situ-growing type bifunctional Fe-Co-Ni alloy based sulfide catalytic electrode for alkaline water splitting is synthesized by one-step hydrothermal sulfuration treatment in an sodium sulfide aqueous medium. The electrochemical characterization results show that among electrodes prepared from alloy substrate with altered Fe:Co:Ni atomic ratios, the as prepared Fe20Co40Ni40-S electrode (with atomic ration of Fe:Co:Ni = 2:4:4) shows the best catalytic performance, achieving low overpotentials of 196 and 261 mV corresponding to the current density of 10 mA·cm<sup>−2</sup> towards OER and HER process in 1 M KOH electrolyte, respectively. It only needs cell voltage of 1.64 V for Fe20Co40Ni40-S to realize fully hydrolyzing water at 10 mA·cm<sup>−2</sup>. These features including high nickel content and high S<sup>2−</sup>/SO<sub>4</sub><sup>2−</sup> ratio in surface elements, great specific surface area, catalyst species in multiple valence states, Ni<sub>3</sub>S<sub>4</sub>/(Fe,Co,Ni)<sub>9</sub>S<sub>8</sub> heterojunction structures, superhydrophilic property, and strong bonding force between matrix and interface are the reasons for the excellent bifunctional catalytic activity of the Fe20Co40Ni40-S electrode.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119802"},"PeriodicalIF":4.1,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

MXene-integrated rare-earth high-entropy oxide nanocomposites for advanced supercapacitor applications 应用于先进超级电容器的mxene集成稀土高熵氧化物纳米复合材料

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-05 DOI: 10.1016/j.jelechem.2026.119803

Piyush V. Patil , P.E. Lokhande , Vilas Kumkale , Dadaso D. Mohite , M.A. Kadam , Syed Khasim , Taymour A. Hamdalla , Deepak Kumar , Udayabhaskar Rednam

In this study, rare-earth high-entropy oxides (RE-HEO, (Ce₀.₂La₀.₂Pr₀.₂Y₀.₂Sm₀.₂)O_₂-δ and Ti₃C₂Tₓ MXene nanocomposite was synthesized through a hydrothermal process followed by annealing to fabricate advanced electrode materials for supercapacitor applications. While RE-HEOs possess significant promise for energy storage, their performance is often limited by low electrical conductivity. This limitation was effectively overcome by integrating highly conductive MXene sheets. Structural and morphological analyses verified the successful formation of the RE-HEO framework and its stable composite with MXene. Electrochemical evaluation revealed that the RE-HEO–MXene electrode delivered a specific capacity of 405C g⁻¹ at 1 A g⁻¹, along with excellent rate capability and long-term cycling stability. Moreover, a solid-state RE-HEO–MXene//AC asymmetric supercapacitor achieved an energy density of 13.97 Wh kg⁻¹ at a power density of 13,750 W kg⁻¹, while maintaining 93 % of its capacitance after 10,000 cycles. These findings emphasize the synergistic contribution of MXene in improving conductivity, surface area, and electrochemical performance of RE-HEO, underscoring its strong potential for next-generation energy storage devices.

在本研究中，稀土高熵氧化物（RE-HEO）、(Ce 0 . 2 La 0 . 2 Pr 0 . 2 Y 0 . 2 Sm 0。采用水热法和退火法制备了2)O₂-δ和Ti₃C₂TₓMXene纳米复合材料，制备了用于超级电容器的高级电极材料。虽然RE-HEOs在能量存储方面具有重要的前景，但它们的性能通常受到低导电性的限制。通过集成高导电性的MXene片有效地克服了这一限制。结构和形态分析证实了RE-HEO框架的成功形成及其与MXene的稳定复合材料。电化学评价表明，RE-HEO-MXene电极在1 a g−1下的比容量为405C g−1，具有良好的倍率能力和长期循环稳定性。此外，固态RE-HEO-MXene //AC非对称超级电容器在功率密度为13,750 W kg - 1时，能量密度达到13.97 Wh kg - 1，并且在10,000次循环后保持93%的电容。这些发现强调了MXene在提高RE-HEO的电导率、表面积和电化学性能方面的协同作用，强调了其在下一代储能设备中的巨大潜力。

{"title":"MXene-integrated rare-earth high-entropy oxide nanocomposites for advanced supercapacitor applications","authors":"Piyush V. Patil , P.E. Lokhande , Vilas Kumkale , Dadaso D. Mohite , M.A. Kadam , Syed Khasim , Taymour A. Hamdalla , Deepak Kumar , Udayabhaskar Rednam","doi":"10.1016/j.jelechem.2026.119803","DOIUrl":"10.1016/j.jelechem.2026.119803","url":null,"abstract":"<div><div>In this study, rare-earth high-entropy oxides (RE-HEO, (Ce₀.₂La₀.₂Pr₀.₂Y₀.₂Sm₀.₂)O<sub>₂-<em>δ</em></sub> and Ti₃C₂Tₓ MXene nanocomposite was synthesized through a hydrothermal process followed by annealing to fabricate advanced electrode materials for supercapacitor applications. While RE-HEOs possess significant promise for energy storage, their performance is often limited by low electrical conductivity. This limitation was effectively overcome by integrating highly conductive MXene sheets. Structural and morphological analyses verified the successful formation of the RE-HEO framework and its stable composite with MXene. Electrochemical evaluation revealed that the RE-HEO–MXene electrode delivered a specific capacity of 405C g<sup>−1</sup> at 1 A g<sup>−1</sup>, along with excellent rate capability and long-term cycling stability. Moreover, a solid-state RE-HEO–MXene//AC asymmetric supercapacitor achieved an energy density of 13.97 Wh kg<sup>−1</sup> at a power density of 13,750 W kg<sup>−1</sup>, while maintaining 93 % of its capacitance after 10,000 cycles. These findings emphasize the synergistic contribution of MXene in improving conductivity, surface area, and electrochemical performance of RE-HEO, underscoring its strong potential for next-generation energy storage devices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119803"},"PeriodicalIF":4.1,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Droplet corrosion kinetics analysis of welded joints with multi-metallographic structure zones 多金相组织带焊接接头液滴腐蚀动力学分析

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-05 DOI: 10.1016/j.jelechem.2026.119800

Zhendong Li, Zhongqiu Fu, Bohai Ji

Atmospheric corrosion of welded joints in steel structures is a prominent issue. Existing research often simplifies welded joints into weld and base metal, ignoring the characteristics of multi-metallographic structures. Furthermore, most studies focus on liquid film environments, with little research exploring the corrosion kinetics under droplet conditions. To reveal the electrochemical corrosion behavior of welded joints with multi-metallographic structure zones under droplet conditions, a numerical model of a three-electrode system was established, coupling mass transfer and corrosion products. By simulating the evolution of mass transfer and corrosion product accumulation, the electrochemical characteristics during the droplet corrosion process were analyzed, and the key factors driving droplet corrosion were clarified. The results indicate that droplet corrosion of welded joints is jointly driven by differences in electrochemical activity among multi-metallographic structure zones and by droplet geometric effects. The corrosion rate and current density are governed by activity, whereas the surface concentration and potential distribution are mainly regulated by geometric effects. Corrosion products accumulate rapidly in high-activity zones, inhibiting the increasing trend of the corrosion rate. In contrast, the corrosion rate in low-activity zones first increases and then decreases under the same droplet.

钢结构焊接接头的大气腐蚀是一个突出的问题。现有的研究往往将焊接接头简化为焊缝和母材，忽略了多金相组织的特点。此外，大多数研究都集中在液膜环境下，很少有研究探讨液滴条件下的腐蚀动力学。为了揭示多金相组织区焊接接头在液滴条件下的电化学腐蚀行为，建立了耦合传质和腐蚀产物的三电极体系的数值模型。通过模拟传质过程和腐蚀产物积累过程，分析了液滴腐蚀过程的电化学特性，明确了驱动液滴腐蚀的关键因素。结果表明，多金相组织区电化学活性差异和液滴几何效应共同驱动焊接接头的液滴腐蚀。腐蚀速率和电流密度主要受活度的影响，而表面浓度和电位分布主要受几何效应的影响。腐蚀产物在高活性区迅速积累，抑制了腐蚀速率的增加趋势。相比之下，在相同液滴作用下，低活度区域的腐蚀速率先增大后减小。

{"title":"Droplet corrosion kinetics analysis of welded joints with multi-metallographic structure zones","authors":"Zhendong Li, Zhongqiu Fu, Bohai Ji","doi":"10.1016/j.jelechem.2026.119800","DOIUrl":"10.1016/j.jelechem.2026.119800","url":null,"abstract":"<div><div>Atmospheric corrosion of welded joints in steel structures is a prominent issue. Existing research often simplifies welded joints into weld and base metal, ignoring the characteristics of multi-metallographic structures. Furthermore, most studies focus on liquid film environments, with little research exploring the corrosion kinetics under droplet conditions. To reveal the electrochemical corrosion behavior of welded joints with multi-metallographic structure zones under droplet conditions, a numerical model of a three-electrode system was established, coupling mass transfer and corrosion products. By simulating the evolution of mass transfer and corrosion product accumulation, the electrochemical characteristics during the droplet corrosion process were analyzed, and the key factors driving droplet corrosion were clarified. The results indicate that droplet corrosion of welded joints is jointly driven by differences in electrochemical activity among multi-metallographic structure zones and by droplet geometric effects. The corrosion rate and current density are governed by activity, whereas the surface concentration and potential distribution are mainly regulated by geometric effects. Corrosion products accumulate rapidly in high-activity zones, inhibiting the increasing trend of the corrosion rate. In contrast, the corrosion rate in low-activity zones first increases and then decreases under the same droplet.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119800"},"PeriodicalIF":4.1,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Precious metal oxygen-evolving anodes for electrolytic reduction of metal oxides in molten LiCl-Li2O electrolyte 用于熔融LiCl-Li2O电解液中金属氧化物电解还原的贵金属析氧阳极

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-05 DOI: 10.1016/j.jelechem.2026.119798

Md Ikram Khan , Peyman Asghari-Rad , Stephanie Castro Baldivieso , Aditya Moudgal , Prabhat Tripathy , Steven Herrmann , Dev Chidambaram , Hojong Kim

Understanding the electrochemical stability of oxygen-evolving anode materials in molten salt electrolytes is essential to enable decarbonized electrolytic reduction of metal oxides (e.g., used nuclear oxide fuels). This work investigated three precious metals (Ir, Ru, and Pt) as oxygen-evolving anodes in molten LiCl-Li₂O (99.0–1.0 wt%) at 650 °C. For consistent measurements, this work employed a three-electrode cell comprised of a two-phase Li–Bi (65–35 at%) reference electrode and a NiO counter electrode. Anodic polarization behavior of each anode was investigated via cyclic voltammetry (CV) and chronoamperometry. The onset potential for oxygen evolution was observed at E > 2.9 V (vs. Li/Li⁺) for the Ir and Ru anodes and anodic current density was as high as 1.0 A cm⁻² at 3.23 V. The dimensional stability of each anode was evaluated from long-term electrolysis experiments (10.0–32.1 h) at 3.23 V. Rapid consumption of the Pt anode was observed after the application of 26,453 C cm⁻² with a reduction in diameter of about 15.8 % due to the formation of a non-protective Li₂PtO₃ compound. The formation of this compound was also observed during CV measurements as additional anodic waves at potentials more negative than that of oxygen evolution. In contrast, both the Ir and Ru anodes exhibited excellent dimensional stability with a reduction in diameter or thickness of less than 1.5 % even after applying greater charge density of ∼41,100 C cm⁻², demonstrating superior stability during oxygen evolution in the LiCl-Li₂O electrolyte.

了解熔盐电解质中出氧阳极材料的电化学稳定性对于实现金属氧化物（例如，使用过的核氧化物燃料）的脱碳电解还原至关重要。本文研究了三种贵金属（Ir、Ru和Pt）在650℃熔融LiCl-Li2O （99.0-1.0 wt%）中作为析氧阳极。为了保持测量的一致性，本研究采用了由两相Li-Bi （65-35 at%）参比电极和NiO反电极组成的三电极电池。通过循环伏安法和计时安培法研究了各阳极的阳极极化行为。在E >； 2.9 V （vs. Li/Li+）下，Ir和Ru阳极的析氧起始电位达到了1.0 A cm−2，且在3.23 V下阳极电流密度高达1.0 A cm−2。通过在3.23 V电压下（10.0-32.1 h）的长期电解实验，评价了各阳极的尺寸稳定性。应用26,453 C cm−2后，观察到Pt阳极的快速消耗，由于形成非保护性的Li2PtO3化合物，其直径减小了约15.8%。这种化合物的形成在CV测量中也被观察到作为附加的阳极波，其电位比析氧电位更负。相比之下，Ir和Ru阳极都表现出优异的尺寸稳定性，即使在施加更大的电荷密度（~ 41,100 C cm - 2）后，直径或厚度的减少也小于1.5%，在LiCl-Li2O电解质中表现出优异的出氧稳定性。

{"title":"Precious metal oxygen-evolving anodes for electrolytic reduction of metal oxides in molten LiCl-Li2O electrolyte","authors":"Md Ikram Khan , Peyman Asghari-Rad , Stephanie Castro Baldivieso , Aditya Moudgal , Prabhat Tripathy , Steven Herrmann , Dev Chidambaram , Hojong Kim","doi":"10.1016/j.jelechem.2026.119798","DOIUrl":"10.1016/j.jelechem.2026.119798","url":null,"abstract":"<div><div>Understanding the electrochemical stability of oxygen-evolving anode materials in molten salt electrolytes is essential to enable decarbonized electrolytic reduction of metal oxides (e.g., used nuclear oxide fuels). This work investigated three precious metals (Ir, Ru, and Pt) as oxygen-evolving anodes in molten LiCl-Li<sub>2</sub>O (99.0–1.0 wt%) at 650 °C. For consistent measurements, this work employed a three-electrode cell comprised of a two-phase Li–Bi (65–35 at%) reference electrode and a NiO counter electrode. Anodic polarization behavior of each anode was investigated via cyclic voltammetry (CV) and chronoamperometry. The onset potential for oxygen evolution was observed at <em>E</em> > 2.9 V (vs. Li/Li<sup>+</sup>) for the Ir and Ru anodes and anodic current density was as high as 1.0 A cm<sup>−2</sup> at 3.23 V. The dimensional stability of each anode was evaluated from long-term electrolysis experiments (10.0–32.1 h) at 3.23 V. Rapid consumption of the Pt anode was observed after the application of 26,453 C cm<sup>−2</sup> with a reduction in diameter of about 15.8 % due to the formation of a non-protective Li<sub>2</sub>PtO<sub>3</sub> compound. The formation of this compound was also observed during CV measurements as additional anodic waves at potentials more negative than that of oxygen evolution. In contrast, both the Ir and Ru anodes exhibited excellent dimensional stability with a reduction in diameter or thickness of less than 1.5 % even after applying greater charge density of ∼41,100 C cm<sup>−2</sup>, demonstrating superior stability during oxygen evolution in the LiCl-Li<sub>2</sub>O electrolyte.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119798"},"PeriodicalIF":4.1,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research progress on catalyst for electrochemical synthesis of ammonia by nitrogen reduction reaction (eNRR) 氮还原反应电化学合成氨催化剂的研究进展

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-04 DOI: 10.1016/j.jelechem.2026.119790

Hui-Jia Mi , Ya-Ya Ma , Tian-Xiang Li , Xiao-Qin Yang , Xing-Xing Cheng , Cheng-Lin Chang , Wei-Feng Shen , Huai-Rong Zhou , Wen-Long Mo

Ammonia (NH₃) is one of the most produced chemicals globally, playing a vital role in agriculture, industry, and energy sectors. However, the conventional Haber-Bosch process requires high-temperature and high-pressure conditions, leading to enormous energy consumption and substantial CO₂ emissions. Electrochemical ammonia synthesis has emerged as a promising alternative due to its mild reaction conditions, zero direct CO₂ emissions, and potential to circumvent thermodynamic limitations. This review begins by outlining the technological pathways for electrochemical ammonia synthesis, followed by a systematic review of recent advances in electrocatalysts for the eNRR. The discussion encompasses a comprehensive range of catalyst systems, from traditional noble metal-based, non-noble metal-based, and metal-free types to emerging atomically dispersed and special-system catalysts. Furthermore, this review integrates key experimental methodologies—such as reactor design, advanced in situ characterization, and electrolyte optimization—into a unified research framework. It concludes with a detailed analysis of the core challenges and future directions for eNRR technology.

氨（NH3）是全球产量最大的化学品之一，在农业、工业和能源部门发挥着至关重要的作用。然而，传统的Haber-Bosch工艺需要高温高压条件，导致巨大的能源消耗和大量的二氧化碳排放。电化学合成氨由于其温和的反应条件、零直接二氧化碳排放以及规避热力学限制的潜力而成为一种有前途的替代方法。本文首先概述了电化学氨合成的技术途径，然后系统回顾了eNRR电催化剂的最新进展。讨论涵盖了广泛的催化剂系统，从传统的贵金属基、非贵金属基、无金属类型到新兴的原子分散和特殊系统催化剂。此外，本综述将关键的实验方法（如反应器设计、先进的原位表征和电解质优化）整合到一个统一的研究框架中。最后，详细分析了eNRR技术面临的核心挑战和未来发展方向。

{"title":"Research progress on catalyst for electrochemical synthesis of ammonia by nitrogen reduction reaction (eNRR)","authors":"Hui-Jia Mi , Ya-Ya Ma , Tian-Xiang Li , Xiao-Qin Yang , Xing-Xing Cheng , Cheng-Lin Chang , Wei-Feng Shen , Huai-Rong Zhou , Wen-Long Mo","doi":"10.1016/j.jelechem.2026.119790","DOIUrl":"10.1016/j.jelechem.2026.119790","url":null,"abstract":"<div><div>Ammonia (NH<sub>3</sub>) is one of the most produced chemicals globally, playing a vital role in agriculture, industry, and energy sectors. However, the conventional Haber-Bosch process requires high-temperature and high-pressure conditions, leading to enormous energy consumption and substantial CO<sub>2</sub> emissions. Electrochemical ammonia synthesis has emerged as a promising alternative due to its mild reaction conditions, zero direct CO<sub>2</sub> emissions, and potential to circumvent thermodynamic limitations. This review begins by outlining the technological pathways for electrochemical ammonia synthesis, followed by a systematic review of recent advances in electrocatalysts for the eNRR. The discussion encompasses a comprehensive range of catalyst systems, from traditional noble metal-based, non-noble metal-based, and metal-free types to emerging atomically dispersed and special-system catalysts. Furthermore, this review integrates key experimental methodologies—such as reactor design, advanced in situ characterization, and electrolyte optimization—into a unified research framework. It concludes with a detailed analysis of the core challenges and future directions for eNRR technology.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119790"},"PeriodicalIF":4.1,"publicationDate":"2026-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-performance electrodes based on metal-organic framework-templated bimetallic molybdate on graphene-decorated nickel foam 基于石墨烯修饰泡沫镍的金属有机框架模板双金属钼酸盐的高性能电极

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-04 DOI: 10.1016/j.jelechem.2026.119791

Lei Yuan, Jiahui Yin, Zhenyu Zhu, Runzhi Wang, Kaituo Fang, Yu Wang, Chunming Xu, Na Xin

A novel NiMoO₄·nH₂O/CoMoO₄@rGO/NF (NCM@GN) composite electrode was fabricated through a MOF-templated in situ growth of bimetallic molybdate on a pre-formed conductive rGO/NF scaffold, which ensures strong interfacial coupling and prevents agglomeration. The hierarchical architecture comprises interconnected nanosheets intimately anchored on nanoparticles, furnishing abundant electroactive sites and rapid ion/electron highways. XPS analysis confirmed the coexistence of mixed valence states (Co²⁺/Co³⁺, Ni²⁺/Ni³⁺), enhancing redox activity. In a three-electrode system, the electrode delivered an ultrahigh specific capacitance of 2452.1 F g⁻¹ at 1 A g⁻¹. When assembled with activated carbon into an asymmetric supercapacitor (NCM@GN//AC), the device achieved an energy density of 63.13 Wh kg⁻¹ at 750 W kg⁻¹ and retained 80.2 % capacitance after 8000 cycles. This work demonstrates a feasible approach for designing high-energy-density electrodes for next-generation supercapacitors based on synergistic composite materials.

采用mof模板法在预成型的导电rGO/NF支架上原位生长钼酸双金属，制备了新型NiMoO₄·nH₂O/CoMoO₄@rGO/NF （NCM@GN）复合电极，保证了强界面耦合和防止团聚。分层结构包括紧密固定在纳米颗粒上的相互连接的纳米片，提供丰富的电活性位点和快速的离子/电子高速公路。XPS分析证实了混合价态（Co2+/Co3+, Ni2+/Ni3+）共存，增强了氧化还原活性。在三电极系统中，电极在1ag−1时提供了2452.1 F g−1的超高比电容。当与活性炭组装成不对称超级电容器（NCM@GN//AC）时，该装置在750 W kg−1时获得了63.13 Wh kg−1的能量密度，并且在8000次循环后保持了80.2%的电容。本研究为基于协同复合材料的下一代超级电容器设计高能量密度电极提供了一种可行的方法。

{"title":"High-performance electrodes based on metal-organic framework-templated bimetallic molybdate on graphene-decorated nickel foam","authors":"Lei Yuan, Jiahui Yin, Zhenyu Zhu, Runzhi Wang, Kaituo Fang, Yu Wang, Chunming Xu, Na Xin","doi":"10.1016/j.jelechem.2026.119791","DOIUrl":"10.1016/j.jelechem.2026.119791","url":null,"abstract":"<div><div>A novel NiMoO₄·nH₂O/CoMoO₄@rGO/NF (NCM@GN) composite electrode was fabricated through a MOF-templated in situ growth of bimetallic molybdate on a pre-formed conductive rGO/NF scaffold, which ensures strong interfacial coupling and prevents agglomeration. The hierarchical architecture comprises interconnected nanosheets intimately anchored on nanoparticles, furnishing abundant electroactive sites and rapid ion/electron highways. XPS analysis confirmed the coexistence of mixed valence states (Co<sup>2+</sup>/Co<sup>3+</sup>, Ni<sup>2+</sup>/Ni<sup>3+</sup>), enhancing redox activity. In a three-electrode system, the electrode delivered an ultrahigh specific capacitance of 2452.1 F g<sup>−1</sup> at 1 A g<sup>−1</sup>. When assembled with activated carbon into an asymmetric supercapacitor (NCM@GN//AC), the device achieved an energy density of 63.13 Wh kg<sup>−1</sup> at 750 W kg<sup>−1</sup> and retained 80.2 % capacitance after 8000 cycles. This work demonstrates a feasible approach for designing high-energy-density electrodes for next-generation supercapacitors based on synergistic composite materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119791"},"PeriodicalIF":4.1,"publicationDate":"2026-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0