Pub Date : 2026-01-01Epub Date: 2025-12-17DOI: 10.1016/j.elecom.2025.108097
Xin Wang, JianChao Xiong, JiPeng Wang, Xi Chen
Electrochemical micromachining (ECMM) is a non-traditional technology in the field of machining, which has excellent machining quality. Ultra short pulse power supply is widely used in electrochemical micro machining, and shortening the pulse width is the only effective strategy to improve machining accuracy. But it is costly, not suitable for practical production, also restricts the development of other signals. To solve this problem, this paper proposes using a two-tone sinusoidal signal instead of ultra short pulses, and establishes a three-dimensional model of electrochemical machining based on finite element method. The influence of input voltage on the surface contour evolution of the anode workpiece is analyzed, and the distribution law of input voltage on the inter electrode electrolyte potential and current density is also analyzed. Theoretical analysis shows that as the amplitude of the input signal voltage in the circuit gradually decreases, the contour formed on the surface of the anode workpiece becomes shallower, and the speed of material decomposition tends to slow down. The experimental results of micro hole processing also showed that with the decrease of input voltage, the processing accuracy significantly improved, reaching the sub-micron level. In addition, when machining microstructures on high-temperature nickel chromium alloys that are difficult to cut, the same level of superior machining accuracy can be achieved.
{"title":"The effect of voltage on accuracy in electrochemical micromachining under two-tone sinusoidal signal","authors":"Xin Wang, JianChao Xiong, JiPeng Wang, Xi Chen","doi":"10.1016/j.elecom.2025.108097","DOIUrl":"10.1016/j.elecom.2025.108097","url":null,"abstract":"<div><div>Electrochemical micromachining (ECMM) is a non-traditional technology in the field of machining, which has excellent machining quality. Ultra short pulse power supply is widely used in electrochemical micro machining, and shortening the pulse width is the only effective strategy to improve machining accuracy. But it is costly, not suitable for practical production, also restricts the development of other signals. To solve this problem, this paper proposes using a two-tone sinusoidal signal instead of ultra short pulses, and establishes a three-dimensional model of electrochemical machining based on finite element method. The influence of input voltage on the surface contour evolution of the anode workpiece is analyzed, and the distribution law of input voltage on the inter electrode electrolyte potential and current density is also analyzed. Theoretical analysis shows that as the amplitude of the input signal voltage in the circuit gradually decreases, the contour formed on the surface of the anode workpiece becomes shallower, and the speed of material decomposition tends to slow down. The experimental results of micro hole processing also showed that with the decrease of input voltage, the processing accuracy significantly improved, reaching the sub-micron level. In addition, when machining microstructures on high-temperature nickel chromium alloys that are difficult to cut, the same level of superior machining accuracy can be achieved.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108097"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145920707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-12-02DOI: 10.1016/j.elecom.2025.108088
R. Adcock , T. Chen , N. Click , M. Tao
Metal separation and recovery are a key aspect of silicon solar module recycling. This paper provides a fundamental understanding of the leaching and electrowinning in hydrochloric acid of two critical metals in silicon solar cells: copper and tin. A leaching model for solder-coated copper wires was developed to reveal rate orders with respect to concentrations of leaching agents and stirring. Kinetic parameters for electrowinning of copper and tin were determined through Tafel and electrochemical impedance spectroscopy analysis. Cyclic voltammetry was used to determine redox potentials of copper and tin allowing their electrochemical separation. Finally high recovery rates and high metal purity, both over 99 %, were achieved for copper and tin through sequential electrowinning. Hydrochloric acid leaching and sequential electrowinning provide a simple and effective option for the recovery of copper and tin from silicon solar modules.
{"title":"Leaching and sequential electrowinning of cu and Sn from silicon solar modules","authors":"R. Adcock , T. Chen , N. Click , M. Tao","doi":"10.1016/j.elecom.2025.108088","DOIUrl":"10.1016/j.elecom.2025.108088","url":null,"abstract":"<div><div>Metal separation and recovery are a key aspect of silicon solar module recycling. This paper provides a fundamental understanding of the leaching and electrowinning in hydrochloric acid of two critical metals in silicon solar cells: copper and tin. A leaching model for solder-coated copper wires was developed to reveal rate orders with respect to concentrations of leaching agents and stirring. Kinetic parameters for electrowinning of copper and tin were determined through Tafel and electrochemical impedance spectroscopy analysis. Cyclic voltammetry was used to determine redox potentials of copper and tin allowing their electrochemical separation. Finally high recovery rates and high metal purity, both over 99 %, were achieved for copper and tin through sequential electrowinning. Hydrochloric acid leaching and sequential electrowinning provide a simple and effective option for the recovery of copper and tin from silicon solar modules.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108088"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145681676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-12-19DOI: 10.1016/j.elecom.2025.108098
Sk. Mohammad Shareef , G. Amba Prasad Rao
Lithium-ion (Li-ion) batteries are highly preferred choice for electric vehicles due to their high energy and power densities, but their performance is highly sensitive to temperature fluctuations from charging–discharging cycles and ambient conditions, which can trigger thermal runaway (TR). Effective thermal management is crucial and involves both external cooling and internal strategies. Advances in electrode materials enhance capacity, rate capability, and operating voltage, allowing more compact, efficient packs while remaining cost-effective. Safety depends on material design, electrolyte stability, and intrinsic resistance to TR. The review details current and developmental work on novel materials for LIBs to mitigate thermal runaway. Li-ion chemistries vary in thermal stability. Commercial 18,650 LiCoO₂ cells typically trigger TR near ∼148 °C, while Ni-rich NCM cells enter TR at 160–170 °C. LiFePO₄ (LFP) pouch and prismatic cells tolerate >200 °C even at high states of charge. TR severity also differs: LFP releases ∼200–400 J g−1, whereas Ni-rich NCM releases 800–1500 J g−1 along with >250 mL g−1 of gas. This highlights a safety–performance trade-off: LFP provides superior thermal tolerance but lower energy density, whereas Ni-rich cathodes offer higher energy at reduced abuse resistance. Electrolyte composition strongly affects TR. Flame-retardant liquid electrolytes reduce flammability but may lower ionic conductivity. Solid polymer and hybrid electrolytes improve safety by resisting ignition and suppressing dendrites, though interfacial and manufacturing challenges remain. Continued advances in materials, safer electrolytes, and battery-management systems are vital for wider EV adoption and alignment with the UN's Sustainable Development Goals and global clean-energy targets.
锂离子（Li-ion）电池因其高能量和功率密度而成为电动汽车的首选，但其性能对充放电周期和环境条件的温度波动高度敏感，可能引发热失控（TR）。有效的热管理是至关重要的，包括外部冷却和内部策略。电极材料的进步提高了容量，速率能力和工作电压，允许更紧凑，高效的包装，同时保持成本效益。安全性取决于材料设计、电解质稳定性和对TR的固有电阻。本文详细介绍了用于lib的新型材料的当前和开发工作，以减轻热失控。锂离子化学物的热稳定性各不相同。商用18650 LiCoO₂电池通常在~ 148°C附近触发TR，而富镍NCM电池在160-170°C时进入TR。LiFePO₄（LFP）袋状和柱状电池即使在高电荷状态下也能承受200°C。TR的严重程度也有所不同：LFP释放约200-400 J g - 1，而富镍NCM释放800-1500 J g - 1以及>；250 mL g - 1的气体。这突出了安全性能的权衡：LFP提供了优越的耐热性，但能量密度较低，而富镍阴极在降低抗滥用能力的情况下提供了更高的能量。电解质成分对TR有很大影响。阻燃液体电解质降低可燃性，但可能降低离子电导率。固体聚合物和混合电解质通过抗点火和抑制枝晶来提高安全性，但界面和制造方面的挑战仍然存在。材料、更安全的电解质和电池管理系统的持续进步对于更广泛地采用电动汽车以及与联合国可持续发展目标和全球清洁能源目标保持一致至关重要。
{"title":"Advancements in lithium-ion battery materials for thermal runaway prevention","authors":"Sk. Mohammad Shareef , G. Amba Prasad Rao","doi":"10.1016/j.elecom.2025.108098","DOIUrl":"10.1016/j.elecom.2025.108098","url":null,"abstract":"<div><div>Lithium-ion (Li-ion) batteries are highly preferred choice for electric vehicles due to their high energy and power densities, but their performance is highly sensitive to temperature fluctuations from charging–discharging cycles and ambient conditions, which can trigger thermal runaway (TR). Effective thermal management is crucial and involves both external cooling and internal strategies. Advances in electrode materials enhance capacity, rate capability, and operating voltage, allowing more compact, efficient packs while remaining cost-effective. Safety depends on material design, electrolyte stability, and intrinsic resistance to TR. The review details current and developmental work on novel materials for LIBs to mitigate thermal runaway. Li-ion chemistries vary in thermal stability. Commercial 18,650 LiCoO₂ cells typically trigger TR near ∼148 °C, while Ni-rich NCM cells enter TR at 160–170 °C. LiFePO₄ (LFP) pouch and prismatic cells tolerate >200 °C even at high states of charge. TR severity also differs: LFP releases ∼200–400 J g<sup>−1</sup>, whereas Ni-rich NCM releases 800–1500 J g<sup>−1</sup> along with >250 mL g<sup>−1</sup> of gas. This highlights a safety–performance trade-off: LFP provides superior thermal tolerance but lower energy density, whereas Ni-rich cathodes offer higher energy at reduced abuse resistance. Electrolyte composition strongly affects TR. Flame-retardant liquid electrolytes reduce flammability but may lower ionic conductivity. Solid polymer and hybrid electrolytes improve safety by resisting ignition and suppressing dendrites, though interfacial and manufacturing challenges remain. Continued advances in materials, safer electrolytes, and battery-management systems are vital for wider EV adoption and alignment with the UN's Sustainable Development Goals and global clean-energy targets.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108098"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145920955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-20DOI: 10.1016/j.elecom.2025.108078
Lin Wang , Hai Yu , YaXin Wang , Chun Miao , QianQian Lei , XinPing Yao , XiaoChen Yao , Xin Wei , JianGuo Lv , Yan Xue , JingWen Zhang , SiWen Zhou , DanDan Qu
{"title":"Corrigendum to “Electrodeposition of p-type Cu2O on n-type TiO2 nanosheet arrays for enhanced photoelectrochemical water splitting” [Electrochem. Commun. 178 (2025) 108009]","authors":"Lin Wang , Hai Yu , YaXin Wang , Chun Miao , QianQian Lei , XinPing Yao , XiaoChen Yao , Xin Wei , JianGuo Lv , Yan Xue , JingWen Zhang , SiWen Zhou , DanDan Qu","doi":"10.1016/j.elecom.2025.108078","DOIUrl":"10.1016/j.elecom.2025.108078","url":null,"abstract":"","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108078"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-12-18DOI: 10.1016/j.elecom.2025.108100
Žiga Gradišar , Pavle Boškoski
Recently a point was made in this journal, that the well-known relation — the Fuoss–Kirkwood formula — between impedance of a causal, linear device and the pertaining distribution of relaxation times is futile. We point-out the incorrect use of relation and provide evidence that the formula is applicable when used correctly.
{"title":"A comment on “On the futility of the Fuoss–Kirkwood relation”","authors":"Žiga Gradišar , Pavle Boškoski","doi":"10.1016/j.elecom.2025.108100","DOIUrl":"10.1016/j.elecom.2025.108100","url":null,"abstract":"<div><div>Recently a point was made in this journal, that the well-known relation — the Fuoss–Kirkwood formula — between impedance of a causal, linear device and the pertaining distribution of relaxation times is futile. We point-out the incorrect use of relation and provide evidence that the formula is applicable when used correctly.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108100"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145786514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study investigates how Al2O3 and V2O5 coatings deposited on nickel foam by atomic layer deposition (ALD) modifies its electrochemical phase evolution in alkaline media. Phase transitions and surface kinetics were characterized using cyclic voltammetry (CV), in situ X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and Tafel analysis. Bare NF exhibits a positive cathodic peak shift for α-Ni(OH)2 formation over 100 CV cycles attributed to surface activation. NF coated with Al2O3 (NF-A) showed a larger shift (+90 mV) indicating enhanced charge transfer kinetics and reduced energy barrier. In contrast, V2O5-coated NF (NF-V) showed no shift suggesting a suppressed surface kinetics. These shifts disappear at higher scan rates suggesting a kinetic effect rather than a diffusion-induced behavior. Tafel and EIS measurements show that NF-A has the lowest charge transfer resistance, while NF-V exhibits the largest resistance. In situ XRD provides direct evidence for α-Ni(OH)2 formation during extended cycling under alkaline conditions. These results demonstrate that different ALD coatings can selectively modulate surface kinetics and phase accessibility of nickel foam which can contribute to the design of nickel-based electrodes for phase-specific electrochemical applications.
{"title":"Influence of atomic layer deposition on nickel hydroxide phase transitions in nickel foam","authors":"Samutr Assavachin , Surat Prempluem , Somlak Ittisanronnachai , Sukritta Janprakhon , Montree Sawangphruk","doi":"10.1016/j.elecom.2025.108091","DOIUrl":"10.1016/j.elecom.2025.108091","url":null,"abstract":"<div><div>This study investigates how Al<sub>2</sub>O<sub>3</sub> and V<sub>2</sub>O<sub>5</sub> coatings deposited on nickel foam by atomic layer deposition (ALD) modifies its electrochemical phase evolution in alkaline media. Phase transitions and surface kinetics were characterized using cyclic voltammetry (CV), <em>in situ</em> X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and Tafel analysis. Bare NF exhibits a positive cathodic peak shift for α-Ni(OH)<sub>2</sub> formation over 100 CV cycles attributed to surface activation. NF coated with Al<sub>2</sub>O<sub>3</sub> (NF-A) showed a larger shift (+90 mV) indicating enhanced charge transfer kinetics and reduced energy barrier. In contrast, V<sub>2</sub>O<sub>5</sub>-coated NF (NF-V) showed no shift suggesting a suppressed surface kinetics. These shifts disappear at higher scan rates suggesting a kinetic effect rather than a diffusion-induced behavior. Tafel and EIS measurements show that NF-A has the lowest charge transfer resistance, while NF-V exhibits the largest resistance. <em>In situ</em> XRD provides direct evidence for α-Ni(OH)<sub>2</sub> formation during extended cycling under alkaline conditions. These results demonstrate that different ALD coatings can selectively modulate surface kinetics and phase accessibility of nickel foam which can contribute to the design of nickel-based electrodes for phase-specific electrochemical applications.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108091"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145732953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-29DOI: 10.1016/j.elecom.2025.108089
Charaf Cherkouk , Marc Ferch , Robert Hahn , Tina Weigel , Thomas Köhler , Christian Ludt , Hartmut Stöcker , Annekatrin Delan , Frans Munnik , Ulrich Kentsch , Christoph Folgner , Thomas Schumann , Viktor Begeza , Yu Cheng , Shengqiang Zhou , Lars Rebohle
Silicon is the most promising anode material for lithium ion batteries (LIBs) because of its high theoretical specific capacity of 3590 mAhg−1 in the Li3.73Si phase at room temperature. However, two important issues such as volume expansion after the lithiation and the growth of a solid electrolyte interface during the cycling on the anodic side hinder the full use of Si as a negative electrode in modern LIBs. Here, we prelithiate the Si thin film on Cu foil using Li+ ion implantation at room temperature with a fluence of 1016 ions/ cm2 and three implantation energies of 1, 2 and 3 keV in order to achieve different depth profiles. The ion implantation enables a high controllability and homogeneity of the Li ion profile in the near surface region of the Si anode. Using both a half and full cell configuration versus lithium nickel cobalt aluminum oxide (NCA) in a liquid electrolyte (1 M LiPF6, EC:DMC 1:1 and 2 wt% of FEC), the implanted Si anodes were cycled and compared to Si anodes without implantation. The morphology and the structure of the Si anodes were investigated using scanning electron microscopy (SEM) in combination with elemental analysis by energy-dispersive X-ray spectroscopy (EDX) and x-ray diffraction (XRD). Depth profiles of the implanted Li+ in the Si anode obtained by elastic recoil detection analysis (ERDA) reveal that the distribution of the implanted Li+ extends from the surface to a depth of ca. 80 nm (deeper than predicted by simulations), which is caused by the roughness of the Cu foil. The roughness of the Si anode on Cu was analyzed using atomic force microscopy (AFM).
{"title":"Prelithiation of silicon thin film anodes using ion implantation for lithium ion batteries","authors":"Charaf Cherkouk , Marc Ferch , Robert Hahn , Tina Weigel , Thomas Köhler , Christian Ludt , Hartmut Stöcker , Annekatrin Delan , Frans Munnik , Ulrich Kentsch , Christoph Folgner , Thomas Schumann , Viktor Begeza , Yu Cheng , Shengqiang Zhou , Lars Rebohle","doi":"10.1016/j.elecom.2025.108089","DOIUrl":"10.1016/j.elecom.2025.108089","url":null,"abstract":"<div><div>Silicon is the most promising anode material for lithium ion batteries (LIBs) because of its high theoretical specific capacity of 3590 mAhg<sup>−1</sup> in the Li<sub>3.73</sub>Si phase at room temperature. However, two important issues such as volume expansion after the lithiation and the growth of a solid electrolyte interface during the cycling on the anodic side hinder the full use of Si as a negative electrode in modern LIBs. Here, we prelithiate the Si thin film on Cu foil using Li<sup>+</sup> ion implantation at room temperature with a fluence of 10<sup>16</sup> ions/ cm<sup>2</sup> and three implantation energies of 1, 2 and 3 keV in order to achieve different depth profiles. The ion implantation enables a high controllability and homogeneity of the Li ion profile in the near surface region of the Si anode. Using both a half and full cell configuration versus lithium nickel cobalt aluminum oxide (NCA) in a liquid electrolyte (1 M LiPF<sub>6</sub>, EC:DMC 1:1 and 2 wt% of FEC), the implanted Si anodes were cycled and compared to Si anodes without implantation. The morphology and the structure of the Si anodes were investigated using scanning electron microscopy (SEM) in combination with elemental analysis by energy-dispersive X-ray spectroscopy (EDX) and x-ray diffraction (XRD). Depth profiles of the implanted Li<sup>+</sup> in the Si anode obtained by elastic recoil detection analysis (ERDA) reveal that the distribution of the implanted Li<sup>+</sup> extends from the surface to a depth of ca. 80 nm (deeper than predicted by simulations), which is caused by the roughness of the Cu foil. The roughness of the Si anode on Cu was analyzed using atomic force microscopy (AFM).</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108089"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145681677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To reduce the cost of platinum electrodes for hydrogen production via water electrolysis, Ni-Pt-Co composite electrodes with trace amounts of Pt and Co deposited on a foam nickel substrate were fabricated using electrochemical deposition techniques, exhibiting varying mass ratios. The prepared NF electrodes, NiPt, NiCo, and Ni-Pt-Co composite electrodes were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electrochemical comparison tests and PEM hydrogen production experiments were conducted on NF electrodes, NiPt, NiCo, and Ni-Pt-Co composite electrodes with varying mass ratios using an electrochemical workstation. In situ hydrogen evolution performance was tested in PEM electrolytic cells, including polarization curves and power consumption analysis for different electrodes, supported by impedance spectroscopy. Results indicate that Pt and Co loading significantly affects hydrogen evolution catalytic activity in composite electrodes. Excessive deposition of either Pt or Co not only fails to enhance performance but may reduce catalytic efficiency. An optimal mass ratio exists among Ni, Pt, and Co. Based on the experimental results, the optimal ratio is 12:0.5:0.5. Compared to the composite electrode with m(Ni):m(Pt) = 12:1, the introduction of Co not only reduces Pt content but also enhances catalytic performance. Therefore, practical applications must prioritize identifying the optimal mass ratio for the supporting metal rather than blindly depositing metals quantitatively. This approach aims to enhance catalytic performance while reducing costs.
{"title":"Study on hydrogen evolution performance of Pt-Co/NF composite electrodes with different mass ratios","authors":"Qian Yin, Jindong Sun, Jiaci Fan, Jinye Xia, Yue Chen","doi":"10.1016/j.elecom.2025.108096","DOIUrl":"10.1016/j.elecom.2025.108096","url":null,"abstract":"<div><div>To reduce the cost of platinum electrodes for hydrogen production via water electrolysis, Ni-Pt-Co composite electrodes with trace amounts of Pt and Co deposited on a foam nickel substrate were fabricated using electrochemical deposition techniques, exhibiting varying mass ratios. The prepared NF electrodes, Ni<img>Pt, Ni<img>Co, and Ni-Pt-Co composite electrodes were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electrochemical comparison tests and PEM hydrogen production experiments were conducted on NF electrodes, Ni<img>Pt, Ni<img>Co, and Ni-Pt-Co composite electrodes with varying mass ratios using an electrochemical workstation. In situ hydrogen evolution performance was tested in PEM electrolytic cells, including polarization curves and power consumption analysis for different electrodes, supported by impedance spectroscopy. Results indicate that Pt and Co loading significantly affects hydrogen evolution catalytic activity in composite electrodes. Excessive deposition of either Pt or Co not only fails to enhance performance but may reduce catalytic efficiency. An optimal mass ratio exists among Ni, Pt, and Co. Based on the experimental results, the optimal ratio is 12:0.5:0.5. Compared to the composite electrode with m(Ni):m(Pt) = 12:1, the introduction of Co not only reduces Pt content but also enhances catalytic performance. Therefore, practical applications must prioritize identifying the optimal mass ratio for the supporting metal rather than blindly depositing metals quantitatively. This approach aims to enhance catalytic performance while reducing costs.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108096"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145786471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2026-01-06DOI: 10.1016/j.elecom.2025.108099
Dan Liu , Zetao Ren , Ziyi Kang , Zhengze Dang , Qianhong Da , Yunbo Zhang , Peizhi Yang
Dead lithium limits the application of lithium metal batteries, and reactivating it via redox mediators has been proven effective. However, the insufficient reaction time of redox mediators limits their reactivation efficiency. Here, a novel periodic reactivation strategy using 1,4-di-tert-butyl-2,5-dimethoxybenzene is proposed. The reactivation process is controlled by reducing the charging/discharging rate and is initiated periodically during cycling. DDB is then oxidized to DDB+ at 3.95 V, shuttles to the anode, and reacts with dead lithium to re-dissolve it as Li+, accomplishing periodical in situ reactivation. This strategy enables an order-of-magnitude reduction in dead lithium, effective cycling capacity recovery, and excellent long-term cycling performance of LiFePO₄-Li cells.
{"title":"A periodic reactivation strategy with redox mediator towards dead Lithium-free Lithium metal batteries","authors":"Dan Liu , Zetao Ren , Ziyi Kang , Zhengze Dang , Qianhong Da , Yunbo Zhang , Peizhi Yang","doi":"10.1016/j.elecom.2025.108099","DOIUrl":"10.1016/j.elecom.2025.108099","url":null,"abstract":"<div><div>Dead lithium limits the application of lithium metal batteries, and reactivating it via redox mediators has been proven effective. However, the insufficient reaction time of redox mediators limits their reactivation efficiency. Here, a novel periodic reactivation strategy using 1,4-di-tert-butyl-2,5-dimethoxybenzene is proposed. The reactivation process is controlled by reducing the charging/discharging rate and is initiated periodically during cycling. DDB is then oxidized to DDB<sup>+</sup> at 3.95 V, shuttles to the anode, and reacts with dead lithium to re-dissolve it as Li<sup>+</sup>, accomplishing periodical in situ reactivation. This strategy enables an order-of-magnitude reduction in dead lithium, effective cycling capacity recovery, and excellent long-term cycling performance of LiFePO₄-Li cells.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108099"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145920956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-01-01Epub Date: 2025-11-24DOI: 10.1016/j.elecom.2025.108087
Vaishnavi Sree Jeganathan, Rohan Akolkar
Non-uniform secondary current distribution at rotating disk electrodes (RDE) is a common problem when using resistive electrolyte media or large applied currents. In a recent publication, we have shown that auxiliary electrodes such as the ring of a rotating ring-disk electrode (RRDE) can help suppress current non-uniformities at the disk enabling reliable electroanalytical measurements. However, this previous work considered linear kinetics where current distribution non-uniformities were moderate. In the present contribution, we consider current distribution non-uniformities encountered under Tafel kinetics. We show, for the case of 2,5-dihydroxy-1,4-benzoquinone (DHBQ) reduction, that optimally chosen ring conditions serve to provide effective shielding at the disk edge rendering the overall disk current distribution to be uniform. Numerical modeling and scaling analysis (using the Wagner number) are presented to aid a user in determining the optimal ring current density for achieving uniform disk current distribution under Tafel kinetics. This approach is especially useful when studying soluble-soluble redox transitions for which, unlike deposit distribution in electrodeposition, the current distribution non-uniformity is not visually apparent.
{"title":"Uniform secondary current distribution at disk electrodes under Tafel kinetics enabled by concentric current-shielding rings","authors":"Vaishnavi Sree Jeganathan, Rohan Akolkar","doi":"10.1016/j.elecom.2025.108087","DOIUrl":"10.1016/j.elecom.2025.108087","url":null,"abstract":"<div><div>Non-uniform secondary current distribution at rotating disk electrodes (RDE) is a common problem when using resistive electrolyte media or large applied currents. In a recent publication, we have shown that auxiliary electrodes such as the ring of a rotating ring-disk electrode (RRDE) can help suppress current non-uniformities at the disk enabling reliable electroanalytical measurements. However, this previous work considered linear kinetics where current distribution non-uniformities were moderate. In the present contribution, we consider current distribution non-uniformities encountered under Tafel kinetics. We show, for the case of 2,5-dihydroxy-1,4-benzoquinone (DHBQ) reduction, that optimally chosen ring conditions serve to provide effective shielding at the disk edge rendering the overall disk current distribution to be uniform. Numerical modeling and scaling analysis (using the Wagner number) are presented to aid a user in determining the optimal ring current density for achieving uniform disk current distribution under Tafel kinetics. This approach is especially useful when studying soluble-soluble redox transitions for which, unlike deposit distribution in electrodeposition, the current distribution non-uniformity is not visually apparent.</div></div>","PeriodicalId":304,"journal":{"name":"Electrochemistry Communications","volume":"182 ","pages":"Article 108087"},"PeriodicalIF":4.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145616378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号