Pub Date : 2026-01-04DOI: 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.
{"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}
Pub Date : 2026-01-04DOI: 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}
Pub Date : 2026-01-03DOI: 10.1016/j.jelechem.2026.119789
Kun Wu , Yingnan Dou , Tian Xia , Qiang Li , Liping Sun , Jingping Wang , Lihua Huo , Hui Zhao
Inductive effect of transition-metal (TM) substitution in ABO3-type perovskite oxides is important to improve their electrocatalytic activities, i.e., variable elemental compositions in the bulk. Here, B-site Fe and Nb-substituted SrCoO3-δ perovskite oxides are reported to screen high-efficient electrocatalysts for water splitting, demonstrating an acceptable candidate, SrCo0.6Fe0.3Nb0.1O3-δ (SCF03N01). Through effective co-doping strategy, SCF03N01 outperforms the commercial IrO2 and Pt/C benchmarks upon a high current density (j) for oxygen/hydrogen evolving electrocatalysis, along with more exceptional operating stability. As supported by density-functional theory (DFT) computation, the Fe and Nb dopants enlarge the Co/Fe-O hybridization, and enhanced overlap of the electron cloud facilitates the charge transfer reaction. Moreover, the rate-limiting steps, O⁎ formation and H⁎ desorption, are accelerated for the oxygen/hydrogen evolving electrocatalysis. For the practical water splitting, the electrolyzer with bifunctional SCF03N01 electrodes requires 1.74 V to drive a high j value (500 mA cm−2), which is even better than the IrO2 and Pt/C couple (1.76 V). This finding highlights the availability of B-site co-doping strategy (proper TM combination) for regulating electrochemical performance of the perovskite oxides, addressing the issues of scare reserve, expensive price, and instability faced by noble-metal catalysts.
abo3型钙钛矿氧化物中过渡金属（TM）取代的诱导效应是提高其电催化活性的重要因素，即在体中改变元素组成。本文报道，b位Fe和nb取代的SrCoO3-δ钙钛矿氧化物筛选了高效的水分解电催化剂，证明了一个可接受的候选，SrCo0.6Fe0.3Nb0.1O3-δ (SCF03N01)。通过有效的共掺杂策略，SCF03N01在氧/氢析电催化的高电流密度(j)上优于商用IrO2和Pt/C基准，同时具有更出色的操作稳定性。密度泛函理论（DFT）计算结果表明，Fe和Nb的掺杂扩大了Co/Fe- o杂化，增强了电子云的重叠，有利于电荷转移反应。此外，氧/氢析出电催化加速了限速步骤，即O -生成和H -解吸。对于实际的水分解，使用双功能SCF03N01电极的电解槽需要1.74 V来驱动高j值（500 mA cm−2），甚至优于IrO2和Pt/C夫妇（1.76 V）。这一发现强调了b位共掺杂策略（适当的TM组合）在调节钙钛矿氧化物电化学性能方面的可行性，解决了贵金属催化剂面临的稀缺储备、昂贵的价格和不稳定性问题。
{"title":"Experimental and theoretical studies on bifunctional Fe and Nb Co-doped SrCoO3-δ perovskite electrocatalyst for oxygen/hydrogen evolving electrocatalysis","authors":"Kun Wu , Yingnan Dou , Tian Xia , Qiang Li , Liping Sun , Jingping Wang , Lihua Huo , Hui Zhao","doi":"10.1016/j.jelechem.2026.119789","DOIUrl":"10.1016/j.jelechem.2026.119789","url":null,"abstract":"<div><div>Inductive effect of transition-metal (TM) substitution in ABO<sub>3</sub>-type perovskite oxides is important to improve their electrocatalytic activities, <em>i.e.</em>, variable elemental compositions in the bulk. Here, B-site Fe and Nb-substituted SrCoO<sub>3-<em>δ</em></sub> perovskite oxides are reported to screen high-efficient electrocatalysts for water splitting, demonstrating an acceptable candidate, SrCo<sub>0.6</sub>Fe<sub>0.3</sub>Nb<sub>0.1</sub>O<sub>3-<em>δ</em></sub> (SCF03N01). Through effective co-doping strategy, SCF03N01 outperforms the commercial IrO<sub>2</sub> and Pt/C benchmarks upon a high current density (<em>j</em>) for oxygen/hydrogen evolving electrocatalysis, along with more exceptional operating stability. As supported by density-functional theory (DFT) computation, the Fe and Nb dopants enlarge the Co/Fe-O hybridization, and enhanced overlap of the electron cloud facilitates the charge transfer reaction. Moreover, the rate-limiting steps, O<sup>⁎</sup> formation and H<sup>⁎</sup> desorption, are accelerated for the oxygen/hydrogen evolving electrocatalysis. For the practical water splitting, the electrolyzer with bifunctional SCF03N01 electrodes requires 1.74 V to drive a high <em>j</em> value (500 mA cm<sup>−2</sup>), which is even better than the IrO<sub>2</sub> and Pt/C couple (1.76 V). This finding highlights the availability of B-site co-doping strategy (proper TM combination) for regulating electrochemical performance of the perovskite oxides, addressing the issues of scare reserve, expensive price, and instability faced by noble-metal catalysts.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119789"},"PeriodicalIF":4.1,"publicationDate":"2026-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922197","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}
Pub Date : 2026-01-02DOI: 10.1016/j.jelechem.2025.119785
Quan Yang , Yanchao Shi , Huazheng Sai , Rui Fu , Hu Zhao
High-energy-density lithium-rich manganese-based oxide (LRMO) materials are promising candidates for next-generation lithium-ion battery (LIB) cathodes. However, their commercialization is limited by voltage and energy density degradation during cycling, which is primarily caused by irreversible anion redox reactions and transition metal (TM) ion migration. In this study, a high-entropy (HE) LRMO, was successfully synthesized via the sol-gel method. and investigated the impact of increased configuration entropy on its electrochemical performance. Electrochemical tests showed that after 50 cycles at a 1C rate (1C = 250 mAh/g) within a voltage range of 2.0–4.8 V, the specific capacity peaked at 215.29 mAh/g and retained 203.13 mAh/g, maintaining a capacity retention rate of 94.35 %. The average voltage dropped from 3.7162 V to 3.3497 V, with a retention rate of 90.77 %. These results demonstrate that in the high-entropy modified system of LRMO, different dopant ions achieve synergistic performance optimization through site-specific interactions: Na+ occupies the sites in Li slabs, which broadens the migration and diffusion pathways for Li+; V5+ facilitates the charge compensation of the Ni2+/Ni4+ redox couple, whereas the incorporation of Y3+, Fe3+ and Al3+ forms strong synergistic bonds with lattice oxygen, thereby enhancing structural stability and promoting the ordered growth of a uniform cathode electrolyte interphase (CEI) film. Experiments have confirmed that the synergistic effects among multiple doped ions and improved elemental compatibility in high-entropy modification significantly enhance the electrochemical performance of the material. This study provides experimental evidence for the application of the high-entropy strategy in LRMO.
{"title":"Preparation of high-entropy Lithium-rich manganese-based materials and mechanisms for optimizing their electrochemical performance","authors":"Quan Yang , Yanchao Shi , Huazheng Sai , Rui Fu , Hu Zhao","doi":"10.1016/j.jelechem.2025.119785","DOIUrl":"10.1016/j.jelechem.2025.119785","url":null,"abstract":"<div><div>High-energy-density lithium-rich manganese-based oxide (LRMO) materials are promising candidates for next-generation lithium-ion battery (LIB) cathodes. However, their commercialization is limited by voltage and energy density degradation during cycling, which is primarily caused by irreversible anion redox reactions and transition metal (TM) ion migration. In this study, a high-entropy (HE) LRMO, was successfully synthesized <em>via</em> the sol-gel method. and investigated the impact of increased configuration entropy on its electrochemical performance. Electrochemical tests showed that after 50 cycles at a 1C rate (1C = 250 mAh/g) within a voltage range of 2.0–4.8 V, the specific capacity peaked at 215.29 mAh/g and retained 203.13 mAh/g, maintaining a capacity retention rate of 94.35 %. The average voltage dropped from 3.7162 V to 3.3497 V, with a retention rate of 90.77 %. These results demonstrate that in the high-entropy modified system of LRMO, different dopant ions achieve synergistic performance optimization through site-specific interactions: Na<sup>+</sup> occupies the sites in Li slabs, which broadens the migration and diffusion pathways for Li<sup>+</sup>; V<sup>5+</sup> facilitates the charge compensation of the Ni<sup>2+</sup>/Ni<sup>4+</sup> redox couple, whereas the incorporation of Y<sup>3+</sup>, Fe<sup>3+</sup> and Al<sup>3+</sup> forms strong synergistic bonds with lattice oxygen, thereby enhancing structural stability and promoting the ordered growth of a uniform cathode electrolyte interphase (CEI) film. Experiments have confirmed that the synergistic effects among multiple doped ions and improved elemental compatibility in high-entropy modification significantly enhance the electrochemical performance of the material. This study provides experimental evidence for the application of the high-entropy strategy in LRMO.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119785"},"PeriodicalIF":4.1,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922273","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}
Lithium/fluorinated carbon (Li/CFx) primary batteries have attracted considerable attention due to their exceptional theoretical energy density of 2180 Wh kg−1. However, the conductive sp2 carbon framework is transformed into insulating C-Fx (x = 1–3) bonds during synthesis, severely impeding charge transport and ion diffusion and thereby limiting high-power characteristics. Herein, an interface reconstruction strategy has proposed by thermal decomposition of ammonium persulfate (APS) to induce reductive defluorination of fluorinated graphite, in which part of the C-Fx bonds break during this process, restoring the sp2-hybridized CC framework and generating C-F bonds with weaker binding energies. Notably, this gas-phase reduction process yields a composite interface on the surface of fluorinated graphite, enabling synergistic ion-electron fast transport. The optimized Li/CFx batteries deliver a high voltage plateau (2.63 V at 0.05C), a remarkable specific capacity (821 mAh g−1) and an energy density (1987 Wh kg−1), together with markedly reduced voltage hysteresis. Even at an ultrahigh rate of 30C, the assembled device retains a high capacity of 453 mAh g−1 and a voltage of 1.92 V, corresponding to a superior power density of 47.55 kW kg−1. This interface reconstruction strategy enables synergistic modulation of CFx and suppression of polarization, thereby overcoming high-power limitations.
锂/氟化碳（Li/CFx）原电池由于其2180 Wh kg−1的特殊理论能量密度而引起了相当大的关注。然而，导电的sp2碳骨架在合成过程中转变为绝缘的C-Fx （x = 1-3）键，严重阻碍了电荷传输和离子扩散，从而限制了高功率特性。本文提出了一种通过过硫酸铵（APS）热分解诱导氟化石墨还原脱氟的界面重建策略，在此过程中部分C-Fx键断裂，恢复sp2杂化CC框架，生成结合能较弱的C-F键。值得注意的是，这种气相还原过程在氟化石墨表面产生复合界面，实现协同离子-电子快速传输。优化后的锂/CFx电池具有较高的电压平台（0.05C时为2.63 V），显著的比容量（821 mAh g−1）和能量密度（1987 Wh kg−1），并显著降低了电压滞后。即使在30℃的超高温度下，组装的器件也能保持453 mAh g−1的高容量和1.92 V的电压，相当于47.55 kW kg−1的优越功率密度。这种界面重构策略实现了CFx的协同调制和极化抑制，从而克服了高功率限制。
{"title":"Gas-phase reduction defluorination and interface reconstruction of fluorinated graphite enable high-power Li/CFx primary batteries","authors":"Jiangmin Jiang, Linlong Wang, Xingchen Li, Fei Zhou, Gaoyu Zhou, Zhan Wang, Zhicheng Ju, Yueli Shi, Quanchao Zhuang","doi":"10.1016/j.jelechem.2025.119786","DOIUrl":"10.1016/j.jelechem.2025.119786","url":null,"abstract":"<div><div>Lithium/fluorinated carbon (Li/CF<sub><em>x</em></sub>) primary batteries have attracted considerable attention due to their exceptional theoretical energy density of 2180 Wh kg<sup>−1</sup>. However, the conductive sp<sup>2</sup> carbon framework is transformed into insulating C-F<sub><em>x</em></sub> (<em>x</em> = 1–3) bonds during synthesis, severely impeding charge transport and ion diffusion and thereby limiting high-power characteristics. Herein, an interface reconstruction strategy has proposed by thermal decomposition of ammonium persulfate (APS) to induce reductive defluorination of fluorinated graphite, in which part of the C-F<sub><em>x</em></sub> bonds break during this process, restoring the sp<sup>2</sup>-hybridized C<img>C framework and generating C-F bonds with weaker binding energies. Notably, this gas-phase reduction process yields a composite interface on the surface of fluorinated graphite, enabling synergistic ion-electron fast transport. The optimized Li/CF<sub><em>x</em></sub> batteries deliver a high voltage plateau (2.63 V at 0.05C), a remarkable specific capacity (821 mAh g<sup>−1</sup>) and an energy density (1987 Wh kg<sup>−1</sup>), together with markedly reduced voltage hysteresis. Even at an ultrahigh rate of 30C, the assembled device retains a high capacity of 453 mAh g<sup>−1</sup> and a voltage of 1.92 V, corresponding to a superior power density of 47.55 kW kg<sup>−1</sup>. This interface reconstruction strategy enables synergistic modulation of CF<sub><em>x</em></sub> and suppression of polarization, thereby overcoming high-power limitations.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119786"},"PeriodicalIF":4.1,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881954","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}
This study presents a straightforward, efficient, and cost-effective approach to creating a highly effective catalyst for electrochemical water splitting. The formation of Ni-Co-S coating was carried out by applying current densities of 10, 20, and 50 mA.cm-2, followed by the synthesis of CoMn LDH, using the cyclic voltammetry method with sweep rates of 5, 10, 20, 30, and 50 mV.s−1. The results indicate that the most effective electrode exhibits a significant electrocatalytic activity in the hydrogen evolution reaction, with a required overpotential of 24 mV at a current density of 10 mA.cm−2 and a Tafel slope of 55 mV.dec−1. Similarly, it also demonstrates a high electrocatalytic activity in the oxygen evolution reaction, with an overpotential of 310 mV at a current density of 10 mA.cm−2 and a Tafel slope of 48 mV.dec−1. After 10 h of electrolysis at a cathodic current density of 100 mA.cm−2, the overpotential of the CoMn LDH @ Ni-Co-S electrode only changed by 4 mV. This demonstrates the exceptional electrochemical durability of this coating in both working conditions and an alkaline environment.
{"title":"Tailoring electrodeposited CoMn LDH@Ni-Co-S nanostructures for active and stable electrocatalyst toward hydrogen and oxygen evolution reactions","authors":"Mostafa Askarzadeh-Torghabeh , Mohammad Ghorbani , Mostafa Nazemi , Ghasem Barati Darband","doi":"10.1016/j.jelechem.2025.119788","DOIUrl":"10.1016/j.jelechem.2025.119788","url":null,"abstract":"<div><div>This study presents a straightforward, efficient, and cost-effective approach to creating a highly effective catalyst for electrochemical water splitting. The formation of Ni-Co-S coating was carried out by applying current densities of 10, 20, and 50 mA.cm<sup>-2</sup>, followed by the synthesis of Co<img>Mn LDH, using the cyclic voltammetry method with sweep rates of 5, 10, 20, 30, and 50 mV.s<sup>−1</sup>. The results indicate that the most effective electrode exhibits a significant electrocatalytic activity in the hydrogen evolution reaction, with a required overpotential of 24 mV at a current density of 10 mA.cm<sup>−2</sup> and a Tafel slope of 55 mV.dec<sup>−1</sup>. Similarly, it also demonstrates a high electrocatalytic activity in the oxygen evolution reaction, with an overpotential of 310 mV at a current density of 10 mA.cm<sup>−2</sup> and a Tafel slope of 48 mV.dec<sup>−1</sup>. After 10 h of electrolysis at a cathodic current density of 100 mA.cm<sup>−2</sup>, the overpotential of the Co<img>Mn LDH @ Ni-Co-S electrode only changed by 4 mV. This demonstrates the exceptional electrochemical durability of this coating in both working conditions and an alkaline environment.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119788"},"PeriodicalIF":4.1,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922277","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}
Pub Date : 2026-01-02DOI: 10.1016/j.jelechem.2025.119787
Anqiang Deng , Hao Chang , Longqiang Li , Yingjie Wang , Sili Wei , Guangyi Tan , Xin Ma , Xiaoyu Yan , Wei Zhang , Hailong Wang
In this study, annealed La0.6Y0.4Ni3.75Al0.15Mn0.1 superlattice hydrogen storage alloys were prepared using vacuum arc melting and vacuum tube annealing methods. The effect of mixed electrolyte solutions, consisting of KOH as the base electrolyte and additional LiOH, ZnCl2, and activators, on the surface structure and electrochemical performance of the hydrogen storage alloy was investigated. The results indicate that after adding LiOH to the solution, the maximum discharge capacity of the alloy electrode significantly increased to 322.7 mA/g, which is approximately an 8 % improvement over the 298.5 mA/g observed in the KOH solution. Additionally, when the alloy electrode was subjected to cyclic charge-discharge tests at a current density of 300 mA/g, the capacity retention after 80 cycles in the LiOH solution was notably improved, reaching 92.94 %, which was significantly better than that in other solutions. Corrosion polarization curves demonstrated that LiOH solution improves the alloy's corrosion resistance and reduces the reaction rate. SEM and EDS analysis of the alloy electrode after cycling revealed that the corrosion products on the alloy surface were much less in the LiOH solution compared to other solutions. The addition of Li+ promoted the formation of La(OH)3 and Y(OH)3 hydroxide films on the alloy surface, while the stronger hydration ability of Li+ facilitated the formation of stable hydrated ion clusters with water, thereby inhibiting the corrosion behavior of the alloy. However, the addition of ZnCl2 led to a noticeable decline in the alloy's high-rate performance, cycling stability, and hydrogen diffusion reaction kinetics, and accelerated the formation of corrosion products. Therefore, optimizing the composition of the electrolyte solution and selecting the appropriate electrolyte components can significantly improve the electrochemical activity and cycling stability of hydrogen storage alloy electrodes, inhibit alloy corrosion, and enhance hydrogen electrode reaction kinetics.
{"title":"Effect of electrolyte solution composition on the electrochemical and corrosion performance of La–Y–Ni-based hydrogen storage alloys","authors":"Anqiang Deng , Hao Chang , Longqiang Li , Yingjie Wang , Sili Wei , Guangyi Tan , Xin Ma , Xiaoyu Yan , Wei Zhang , Hailong Wang","doi":"10.1016/j.jelechem.2025.119787","DOIUrl":"10.1016/j.jelechem.2025.119787","url":null,"abstract":"<div><div>In this study, annealed La<sub>0.6</sub>Y<sub>0.4</sub>Ni<sub>3.75</sub>Al<sub>0.15</sub>Mn<sub>0.1</sub> superlattice hydrogen storage alloys were prepared using vacuum arc melting and vacuum tube annealing methods. The effect of mixed electrolyte solutions, consisting of KOH as the base electrolyte and additional LiOH, ZnCl<sub>2</sub>, and activators, on the surface structure and electrochemical performance of the hydrogen storage alloy was investigated. The results indicate that after adding LiOH to the solution, the maximum discharge capacity of the alloy electrode significantly increased to 322.7 mA/g, which is approximately an 8 % improvement over the 298.5 mA/g observed in the KOH solution. Additionally, when the alloy electrode was subjected to cyclic charge-discharge tests at a current density of 300 mA/g, the capacity retention after 80 cycles in the LiOH solution was notably improved, reaching 92.94 %, which was significantly better than that in other solutions. Corrosion polarization curves demonstrated that LiOH solution improves the alloy's corrosion resistance and reduces the reaction rate. SEM and EDS analysis of the alloy electrode after cycling revealed that the corrosion products on the alloy surface were much less in the LiOH solution compared to other solutions. The addition of Li<sup>+</sup> promoted the formation of La(OH)<sub>3</sub> and Y(OH)<sub>3</sub> hydroxide films on the alloy surface, while the stronger hydration ability of Li<sup>+</sup> facilitated the formation of stable hydrated ion clusters with water, thereby inhibiting the corrosion behavior of the alloy. However, the addition of ZnCl<sub>2</sub> led to a noticeable decline in the alloy's high-rate performance, cycling stability, and hydrogen diffusion reaction kinetics, and accelerated the formation of corrosion products. Therefore, optimizing the composition of the electrolyte solution and selecting the appropriate electrolyte components can significantly improve the electrochemical activity and cycling stability of hydrogen storage alloy electrodes, inhibit alloy corrosion, and enhance hydrogen electrode reaction kinetics.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119787"},"PeriodicalIF":4.1,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922280","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}
Pub Date : 2026-01-02DOI: 10.1016/j.jelechem.2025.119784
Binxuan Hong, Jiyou Tang, Zicheng Yang, Yi Feng, Jianfeng Yao
The pursuit of high-energy supercapacitors demands electrode materials with tailored architectures and synergistic coupling. This work presents an advanced asymmetric supercapacitor system through innovative material engineering: a tubular CoNi-layered double hydroxide (CoNi-LDH) cathode synthesized via a gentle etching approach paired with a hierarchical N,O-doped carbon anode (denoted as MGF) featuring three-dimensional porous networks. The unique tubular configuration enables exceptional ion accessibility, whereas the heteroatom-enriched carbon matrix facilitates rapid ion transport and provides substantial pseudocapacitive contributions. The strategic integration of these electrodes (CoNi-LDH-30//MGF) creates remarkable kinetic compatibility, permitting stable operation at a high voltage window of 0–1.7 V in aqueous KOH electrolyte, delivering a high energy density of 64.6 Wh/kg at 852 W/kg and maintaining 91 % capacity retention after 5000 cycles. This study establishes synergistic electrode engineering as an effective paradigm for next-generation energy storage systems, advancing beyond conventional material selection toward deliberate functional pairing.
{"title":"Design and synergistic pairing of tubular CoNi-LDH and hierarchical N,O-doped carbon for high-performance asymmetric supercapacitors","authors":"Binxuan Hong, Jiyou Tang, Zicheng Yang, Yi Feng, Jianfeng Yao","doi":"10.1016/j.jelechem.2025.119784","DOIUrl":"10.1016/j.jelechem.2025.119784","url":null,"abstract":"<div><div>The pursuit of high-energy supercapacitors demands electrode materials with tailored architectures and synergistic coupling. This work presents an advanced asymmetric supercapacitor system through innovative material engineering: a tubular CoNi-layered double hydroxide (CoNi-LDH) cathode synthesized via a gentle etching approach paired with a hierarchical N,O-doped carbon anode (denoted as MGF) featuring three-dimensional porous networks. The unique tubular configuration enables exceptional ion accessibility, whereas the heteroatom-enriched carbon matrix facilitates rapid ion transport and provides substantial pseudocapacitive contributions. The strategic integration of these electrodes (CoNi-LDH-30//MGF) creates remarkable kinetic compatibility, permitting stable operation at a high voltage window of 0–1.7 V in aqueous KOH electrolyte, delivering a high energy density of 64.6 Wh/kg at 852 W/kg and maintaining 91 % capacity retention after 5000 cycles. This study establishes synergistic electrode engineering as an effective paradigm for next-generation energy storage systems, advancing beyond conventional material selection toward deliberate functional pairing.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119784"},"PeriodicalIF":4.1,"publicationDate":"2026-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881956","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}
Lithium–sulfur batteries (LSBs) are considered promising next-generation energy storage devices due to their high theoretical capacity and energy density. Nevertheless, practical implementation is hindered by the insulating nature of sulfur and the polysulfide shuttle effect. In this work, a hollow-sphere-structured Co-NC@V2O3 composite is developed as a separator modifier through in situ growth of ZIF-67 on V2O3 hollow spheres followed by carbonization. The unique architecture, combining conductive nitrogen-doped carbon with polar V2O3, not only alleviates volume expansion but also provides strong polysulfide adsorption and catalytic conversion sites. As a result, the modified battery delivers an initial discharge capacity of 1358.51 mAh g−1 at 0.2C and retains 804.27 mAh g−1 after 500 cycles. Moreover, under a high sulfur loading of 4.5 mg cm−2, the battery maintains 57.82 % of its initial capacity after 300 cycles, with a low capacity decay rate of 0.14 % per cycle. This work provides an effective separator-modification strategy for high-performance LSBs.
锂硫电池（lsb）由于具有较高的理论容量和能量密度，被认为是有前途的下一代储能设备。然而，硫的绝缘性和多硫化物的穿梭效应阻碍了实际的实施。在这项工作中，通过在V2O3空心球上原位生长ZIF-67然后碳化，开发了一种空心球结构Co-NC@V2O3复合材料作为分离器改性剂。这种独特的结构将导电氮掺杂碳与极性V2O3结合在一起，不仅减轻了体积膨胀，而且提供了强大的多硫化物吸附和催化转化位点。因此，改进后的电池在0.2C时的初始放电容量为1358.51 mAh g - 1，并在500次循环后保持804.27 mAh g - 1。此外，在4.5 mg cm−2的高硫负载下，电池在300次循环后保持了57.82%的初始容量，每个循环的容量衰减率为0.14%。这项工作为高性能lbs提供了一种有效的分离器改造策略。
{"title":"Co-NC@V2O3 hollow sphere as an efficient polysulfide immobilizer and promoter for high-performance lithium‑sulfur batteries","authors":"Zhiqiang Tang, Jiawei Shen, Xinzuo Fang, Fajun Wang, Junfei Ou, Changquan Li","doi":"10.1016/j.jelechem.2025.119783","DOIUrl":"10.1016/j.jelechem.2025.119783","url":null,"abstract":"<div><div>Lithium–sulfur batteries (LSBs) are considered promising next-generation energy storage devices due to their high theoretical capacity and energy density. Nevertheless, practical implementation is hindered by the insulating nature of sulfur and the polysulfide shuttle effect. In this work, a hollow-sphere-structured Co-NC@V<sub>2</sub>O<sub>3</sub> composite is developed as a separator modifier through in situ growth of ZIF-67 on V<sub>2</sub>O<sub>3</sub> hollow spheres followed by carbonization. The unique architecture, combining conductive nitrogen-doped carbon with polar V<sub>2</sub>O<sub>3</sub>, not only alleviates volume expansion but also provides strong polysulfide adsorption and catalytic conversion sites. As a result, the modified battery delivers an initial discharge capacity of 1358.51 mAh g<sup>−1</sup> at 0.2C and retains 804.27 mAh g<sup>−1</sup> after 500 cycles. Moreover, under a high sulfur loading of 4.5 mg cm<sup>−2</sup>, the battery maintains 57.82 % of its initial capacity after 300 cycles, with a low capacity decay rate of 0.14 % per cycle. This work provides an effective separator-modification strategy for high-performance LSBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119783"},"PeriodicalIF":4.1,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922272","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}
Based on the electrostatic spinning process, a boronic acid-functionalized electrochemical sensor was designed. Polyethylenimine (PEI) was introduced into the electrospinning solution, which promoted the formation of fine particulate coatings from tin hydrolysis products. These particles were effectively anchored onto the nanofiber surfaces, resulting in a unique morphology that significantly increases the active sensing area. Boronic Acid Bonds Grafted onto Material Surfaces can effectively capture substances containing vicinal diols. By combining with molecular imprinting (MIP) which features specific imprinted cavities, this approach enables the capture of OVA. The blocking of these cavities leads to a change in the current response, thus achieving detection. The sensor demonstrates excellent selectivity and sensitivity, with a detection limit of 1.3 fg/mL. It can be applied to detect OVA in egg-free bread, showcasing certain practical detection capabilities.
{"title":"Polyethyleneimine-modified electrospun SnC for the detection of ovalbumin","authors":"Haoxiang Wang, Yuyang He, Ruoyu Wang, Mengqi Lu, Dongpo Xu","doi":"10.1016/j.jelechem.2025.119770","DOIUrl":"10.1016/j.jelechem.2025.119770","url":null,"abstract":"<div><div>Based on the electrostatic spinning process, a boronic acid-functionalized electrochemical sensor was designed. Polyethylenimine (PEI) was introduced into the electrospinning solution, which promoted the formation of fine particulate coatings from tin hydrolysis products. These particles were effectively anchored onto the nanofiber surfaces, resulting in a unique morphology that significantly increases the active sensing area. Boronic Acid Bonds Grafted onto Material Surfaces can effectively capture substances containing vicinal diols. By combining with molecular imprinting (MIP) which features specific imprinted cavities, this approach enables the capture of OVA. The blocking of these cavities leads to a change in the current response, thus achieving detection. The sensor demonstrates excellent selectivity and sensitivity, with a detection limit of 1.3 fg/mL. It can be applied to detect OVA in egg-free bread, showcasing certain practical detection capabilities.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119770"},"PeriodicalIF":4.1,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922269","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}
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