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}
Pub Date : 2025-12-31DOI: 10.1016/j.jelechem.2025.119778
Yong Luo , Feng Gao , Jie Zhang , Xiaoyan Zhang
The development of efficient and durable bifunctional electrocatalysts based on earth-abundant elements for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is critical for advancing sustainable hydrogen production. Herein, a facile one-step hydrothermal strategy was developed to synthesize Ru-doped α-MnO2 nanoneedles grown on carbon paper (Ru0.02MnO2/CP) as a novel bifunctional electroccatalyst. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analyses revealed that Ru incorporation induces uniform lattice distortion in MnO2, significantly increasing the density of oxygen vacancies and catalytically active Mn3+ sites. The structural modifications enhance the intrinsic electrochemical activity and structural stability of MnO2 during HER/OER in alkaline media. The optimized Ru0.02MnO2/CP catalyst exhibited exceptional bifunctional performance, achieving low overpotentials of 107 mV (HER) and 261 mV (OER) at 10 mA cm−2. Furthermore, stability testing under continuous operation reveals <6 % activity loss over 100 h at 10 mA cm−2. Density functional theory (DFT) calculations revealed that Ru doping optimizes the adsorption/desorption energetics of reaction intermediates (*H for HER; *OH for OER), effectively lowering the kinetic barriers and overpotentials for both half-reactions. This work provides a rational strategy for designing high-performance and cost-effective bifunctional electrocatalyst, advancing their potential application in scalable water electrolysis for sustainable hydrogen production.
开发高效、耐用的基于地球丰度元素的析氢和析氧双功能电催化剂是推进可持续制氢的关键。本文提出了一种简单的一步水热策略来合成在碳纸上生长的ru掺杂α-MnO2纳米针（Ru0.02MnO2/CP）作为新型双功能电催化剂。透射电镜（TEM）和x射线衍射（XRD）分析表明，Ru的掺入导致MnO2中均匀的晶格畸变，显著增加了氧空位和催化活性Mn3+位点的密度。这些结构修饰提高了MnO2在碱性介质中HER/OER过程中的固有电化学活性和结构稳定性。优化后的Ru0.02MnO2/CP催化剂表现出优异的双功能性能，在10 mA cm−2下可实现107 mV （HER）和261 mV （OER）的低过电位。此外，在连续操作下的稳定性测试显示，在10 mA cm - 2下，100小时的活度损失为<； 6%。密度泛函理论（DFT）计算表明，Ru掺杂优化了反应中间体的吸附/解吸能量（HER为*H， OER为*OH），有效降低了半反应的动力学势垒和过电位。本研究为设计高性能、低成本的双功能电催化剂提供了合理的策略，促进了双功能电催化剂在大规模水电解可持续制氢中的潜在应用。
{"title":"Enhanced electrocatalytic water splitting performance and stability of MnO₂ through Ru doping","authors":"Yong Luo , Feng Gao , Jie Zhang , Xiaoyan Zhang","doi":"10.1016/j.jelechem.2025.119778","DOIUrl":"10.1016/j.jelechem.2025.119778","url":null,"abstract":"<div><div>The development of efficient and durable bifunctional electrocatalysts based on earth-abundant elements for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is critical for advancing sustainable hydrogen production. Herein, a facile one-step hydrothermal strategy was developed to synthesize Ru-doped α-MnO<sub>2</sub> nanoneedles grown on carbon paper (Ru<sub>0.02</sub>MnO<sub>2</sub>/CP) as a novel bifunctional electroccatalyst. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) analyses revealed that Ru incorporation induces uniform lattice distortion in MnO<sub>2</sub>, significantly increasing the density of oxygen vacancies and catalytically active Mn<sup>3+</sup> sites. The structural modifications enhance the intrinsic electrochemical activity and structural stability of MnO<sub>2</sub> during HER/OER in alkaline media. The optimized Ru<sub>0.02</sub>MnO<sub>2</sub>/CP catalyst exhibited exceptional bifunctional performance, achieving low overpotentials of 107 mV (HER) and 261 mV (OER) at 10 mA cm<sup>−2</sup>. Furthermore, stability testing under continuous operation reveals <6 % activity loss over 100 h at 10 mA cm<sup>−2</sup>. Density functional theory (DFT) calculations revealed that Ru doping optimizes the adsorption/desorption energetics of reaction intermediates (*H for HER; *OH for OER), effectively lowering the kinetic barriers and overpotentials for both half-reactions. This work provides a rational strategy for designing high-performance and cost-effective bifunctional electrocatalyst, advancing their potential application in scalable water electrolysis for sustainable hydrogen production.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119778"},"PeriodicalIF":4.1,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922276","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 : 2025-12-30DOI: 10.1016/j.jelechem.2025.119777
Kapil Dev Verma , Kamal K. Kar
In the rapidly advancing field of energy storage, the integration of sustainable materials with superior performance metrics has become essential. Bird feathers, an abundant byproduct of poultry and domestic waste, are largely underutilised and contribute to environmental concerns due to their resistance to degradation. Composed of β-keratin and melanin pigments, feathers offer a unique opportunity for sustainable conversion into value-added carbon materials. In this study, feathers of three distinct colours, black (crow), grey (peacock), and white (duck), were employed as precursors for activated carbon electrodes to evaluate the role of melanin concentration on heteroatom incorporation and electrochemical performance. The prepared activated carbons demonstrated a strong correlation between pigmentation and specific capacitance, attributed to melanin-induced nitrogen and oxygen functionalities. The symmetric supercapacitors delivered specific capacitances of 361 ± 10 F g−1 for crow feather-derived carbon, 384 ± 2.5 F g−1 for peacock feather-derived carbon, and 341 ± 9 F g−1 for duck feather-derived carbon at 1 A g−1 in 6 M KOH electrolyte. These findings establish bird feathers as a sustainable carbon precursor and highlight the critical role of melanin content in enhancing electrochemical charge storage, thereby offering a pathway for environmentally benign and high-performance supercapacitor electrode materials.
在快速发展的能源存储领域，具有卓越性能指标的可持续材料的集成已成为必不可少的。鸟类羽毛是家禽和家庭废物的大量副产品，但由于它们不易降解，因此在很大程度上未得到充分利用，并引起环境问题。羽毛由β-角蛋白和黑色素组成，为可持续转化为增值碳材料提供了独特的机会。本研究采用黑色（乌鸦）、灰色（孔雀）和白色（鸭子）三种不同颜色的羽毛作为活性炭电极的前驱体，以评估黑色素浓度对杂原子掺入和电化学性能的影响。所制备的活性炭在色素沉着和比电容之间表现出很强的相关性，这归因于黑色素诱导的氮和氧官能团。在6 M KOH电解液中，在1 A g−1条件下，乌鸦羽毛衍生碳的比电容为361±10 F g−1，孔雀羽毛衍生碳的比电容为384±2.5 F g−1，鸭羽毛衍生碳的比电容为341±9 F g−1。这些发现证实了鸟羽毛是一种可持续的碳前体，并强调了黑色素含量在增强电化学电荷存储方面的关键作用，从而为环保和高性能的超级电容器电极材料提供了途径。
{"title":"Melanin-driven heteroatom incorporation in bird feather-derived activated carbon for high-performance supercapacitors","authors":"Kapil Dev Verma , Kamal K. Kar","doi":"10.1016/j.jelechem.2025.119777","DOIUrl":"10.1016/j.jelechem.2025.119777","url":null,"abstract":"<div><div>In the rapidly advancing field of energy storage, the integration of sustainable materials with superior performance metrics has become essential. Bird feathers, an abundant byproduct of poultry and domestic waste, are largely underutilised and contribute to environmental concerns due to their resistance to degradation. Composed of β-keratin and melanin pigments, feathers offer a unique opportunity for sustainable conversion into value-added carbon materials. In this study, feathers of three distinct colours, black (crow), grey (peacock), and white (duck), were employed as precursors for activated carbon electrodes to evaluate the role of melanin concentration on heteroatom incorporation and electrochemical performance. The prepared activated carbons demonstrated a strong correlation between pigmentation and specific capacitance, attributed to melanin-induced nitrogen and oxygen functionalities. The symmetric supercapacitors delivered specific capacitances of 361 ± 10 F g<sup>−1</sup> for crow feather-derived carbon, 384 ± 2.5 F g<sup>−1</sup> for peacock feather-derived carbon, and 341 ± 9 F g<sup>−1</sup> for duck feather-derived carbon at 1 A g<sup>−1</sup> in 6 M KOH electrolyte. These findings establish bird feathers as a sustainable carbon precursor and highlight the critical role of melanin content in enhancing electrochemical charge storage, thereby offering a pathway for environmentally benign and high-performance supercapacitor electrode materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119777"},"PeriodicalIF":4.1,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881864","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}
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