Pub Date : 2026-01-09DOI: 10.1016/j.jelechem.2026.119797
Nada F. Atta, Soha A. Abdel Gawad, Ahmed Galal, Afaf Abdel Razik, Asmaa R.M. El-Gohary
{"title":"Corrigendum to “Efficient electrochemical sensor for determination of H2O2 in human serum based on nano iron-nickel alloy/carbon nanotubes/ionic liquid crystal composite” [J. Electroanal. Chem. 881 (2021) 114953]","authors":"Nada F. Atta, Soha A. Abdel Gawad, Ahmed Galal, Afaf Abdel Razik, Asmaa R.M. El-Gohary","doi":"10.1016/j.jelechem.2026.119797","DOIUrl":"10.1016/j.jelechem.2026.119797","url":null,"abstract":"","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1002 ","pages":"Article 119797"},"PeriodicalIF":4.1,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034679","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}
To address the energy efficiency bottlenecks and serial processing delays inherent in the von Neumann architecture, this study developed an artificial synapse based on the classic inorganic electrochromic material tungsten trioxide (WO₃). Unlike traditional electrical signal reading schemes, this device achieves reversible transmittance modulation through voltage-controlled ion insertion/extraction, directly utilizing optical responses to simulate key biological synapse plasticity phenomena such as paired pulse facilitation (PPF) and dynamic short-term/long-term plasticity conversion. By combining recurrent neural networks (RNN) to extract and recognise transmission response features, the device successfully achieved high-precision recognition of 26 English letters encoded by optical pulses, with an accuracy rate of 95.83%. This work highlights the potential of electrochromic devices for achieving high-performance neuromorphic computing, offering a novel approach to overcoming the von Neumann bottleneck.
{"title":"Artificial synapses with electrochromic optically responsive for signal recognition","authors":"Xueqi Chen, Junsong Peng, Manyao Wang, Shuran Liao, Yang Chen, Zongyu Huang, Xiang Qi","doi":"10.1016/j.jelechem.2026.119825","DOIUrl":"10.1016/j.jelechem.2026.119825","url":null,"abstract":"<div><div>To address the energy efficiency bottlenecks and serial processing delays inherent in the von Neumann architecture, this study developed an artificial synapse based on the classic inorganic electrochromic material tungsten trioxide (WO₃). Unlike traditional electrical signal reading schemes, this device achieves reversible transmittance modulation through voltage-controlled ion insertion/extraction, directly utilizing optical responses to simulate key biological synapse plasticity phenomena such as paired pulse facilitation (PPF) and dynamic short-term/long-term plasticity conversion. By combining recurrent neural networks (RNN) to extract and recognise transmission response features, the device successfully achieved high-precision recognition of 26 English letters encoded by optical pulses, with an accuracy rate of 95.83%. This work highlights the potential of electrochromic devices for achieving high-performance neuromorphic computing, offering a novel approach to overcoming the von Neumann bottleneck.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119825"},"PeriodicalIF":4.1,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975383","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 : 2026-01-09DOI: 10.1016/j.jelechem.2026.119796
Nada F. Atta, Ahmed Galal, Asmaa R.M. El-Gohary
{"title":"Corrigendum to “An innovative design of hydrazine hydrate electrochemical sensor based on decoration of crown ether/Nafion/carbon nanotubes composite with gold nanoparticles” [J. Electroanal. Chem. 888 (2021) 115165]","authors":"Nada F. Atta, Ahmed Galal, Asmaa R.M. El-Gohary","doi":"10.1016/j.jelechem.2026.119796","DOIUrl":"10.1016/j.jelechem.2026.119796","url":null,"abstract":"","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1002 ","pages":"Article 119796"},"PeriodicalIF":4.1,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034412","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 : 2026-01-08DOI: 10.1016/j.jelechem.2026.119823
Yunlin Bai , Tianhe Li , Hao Chen , Yang Xu , Jiahao Ji , Guanghua Wei , Junfang Cheng
Developing efficient and durable oxygen reduction reaction (ORR) catalysts is critical for advancing proton exchange membrane fuel cells (PEMFCs). While Pt-based alloy catalysts exhibit enhanced ORR activity, their disordered nanostructures often compromise durability. In this work, a carbon-supported Pt3Cu alloy catalyst with a core-shell architecture (Pt3Cu@Pt/C) was synthesized via a controlled impregnation-reduction method followed by acid-washing to construct a Pt-rich shell. Comprehensive physicochemical characterizations confirmed the formation of a face-centered cubic (FCC) structure with a Pt3Cu core and a Pt-rich shell. Alloying with Cu was found to downshift the Pt d-band center, thereby optimizing the adsorption strength of oxygen intermediates. Electrochemical evaluations revealed that the Pt3Cu@Pt/C catalyst exhibited a mass activity (MA) of 0.37 A mg−1 and an electrochemical surface area (ECSA) of 89.43 m2 g−1, surpassing commercial Pt/C. Although the core-shell treatment slightly reduced ORR activity compared to untreated Pt3Cu/C, the Pt3Cu@Pt/C catalyst demonstrated exceptional durability, retaining >70% of its initial ECSA and showing only a 27% decay in MA after 30,000 accelerated stress test cycles, far outperforming both Pt3Cu/C and commercial Pt/C. Density functional theory (DFT) calculations revealed that the Pt shell increased Cu vacancy formation energy by 0.8 eV, effectively suppressing Cu dissolution and enhancing structural stability. This work highlights the synergistic electronic and geometric effects of core-shell nanostructures in balancing ORR activity and durability, providing insights for designing advanced Pt-based catalysts.
开发高效、耐用的氧还原反应催化剂是推进质子交换膜燃料电池(pemfc)发展的关键。虽然pt基合金催化剂表现出增强的ORR活性,但其无序的纳米结构往往会损害耐久性。本文通过控制浸渍还原法制备了一种核壳结构的碳负载Pt3Cu合金催化剂(Pt3Cu@Pt/C),并通过酸洗法制备了富铂壳。综合物理化学表征证实形成了一个具有Pt3Cu核和富pt壳层的面心立方(FCC)结构。Cu合金可以使Pt d带中心下移,从而优化氧中间体的吸附强度。电化学评价表明,Pt3Cu@Pt/C催化剂的质量活性(MA)为0.37 a mg−1,电化学表面积(ECSA)为89.43 m2 g−1,超过了商品Pt/C。虽然与未处理的Pt3Cu/C相比,核壳处理略微降低了ORR活性,但Pt3Cu@Pt/C催化剂表现出了出色的耐久性,保留了70%的初始ECSA,在30,000次加速应力测试循环后,MA仅衰减27%,远远优于Pt3Cu/C和商用Pt/C。密度泛函理论(DFT)计算表明,Pt壳层使Cu空位形成能提高0.8 eV,有效抑制Cu的溶解,提高结构稳定性。这项工作强调了核壳纳米结构在平衡ORR活性和耐久性方面的协同电子和几何效应,为设计先进的pt基催化剂提供了见解。
{"title":"High-performance core-shell Pt3Cu@Pt/C nanocatalysts for oxygen reduction reaction","authors":"Yunlin Bai , Tianhe Li , Hao Chen , Yang Xu , Jiahao Ji , Guanghua Wei , Junfang Cheng","doi":"10.1016/j.jelechem.2026.119823","DOIUrl":"10.1016/j.jelechem.2026.119823","url":null,"abstract":"<div><div>Developing efficient and durable oxygen reduction reaction (ORR) catalysts is critical for advancing proton exchange membrane fuel cells (PEMFCs). While Pt-based alloy catalysts exhibit enhanced ORR activity, their disordered nanostructures often compromise durability. In this work, a carbon-supported Pt<sub>3</sub>Cu alloy catalyst with a core-shell architecture (Pt<sub>3</sub>Cu@Pt/C) was synthesized via a controlled impregnation-reduction method followed by acid-washing to construct a Pt-rich shell. Comprehensive physicochemical characterizations confirmed the formation of a face-centered cubic (FCC) structure with a Pt<sub>3</sub>Cu core and a Pt-rich shell. Alloying with Cu was found to downshift the Pt d-band center, thereby optimizing the adsorption strength of oxygen intermediates. Electrochemical evaluations revealed that the Pt<sub>3</sub>Cu@Pt/C catalyst exhibited a mass activity (MA) of 0.37 A mg<sup>−1</sup> and an electrochemical surface area (ECSA) of 89.43 m<sup>2</sup> g<sup>−1</sup>, surpassing commercial Pt/C. Although the core-shell treatment slightly reduced ORR activity compared to untreated Pt<sub>3</sub>Cu/C, the Pt<sub>3</sub>Cu@Pt/C catalyst demonstrated exceptional durability, retaining >70% of its initial ECSA and showing only a 27% decay in MA after 30,000 accelerated stress test cycles, far outperforming both Pt<sub>3</sub>Cu/C and commercial Pt/C. Density functional theory (DFT) calculations revealed that the Pt shell increased Cu vacancy formation energy by 0.8 eV, effectively suppressing Cu dissolution and enhancing structural stability. This work highlights the synergistic electronic and geometric effects of core-shell nanostructures in balancing ORR activity and durability, providing insights for designing advanced Pt-based catalysts.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119823"},"PeriodicalIF":4.1,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922267","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 : 2026-01-08DOI: 10.1016/j.jelechem.2026.119824
Feng Zhang , Haiying Guo , Minjia Ni , Na Li , Liangbo Xia , Xiuying Wang , Xiaoyi Chen
The improvement of rate performance and cycling stability of nickel sulfides is an effective strategy to improve the energy density of supercapacitors. In this work, we developed a simple, cheap, and high-yield strategy to fabricate NixCo1-xS2@porous carbon composites by using Ni2+, Co2+ and biomass ammonium alginate as raw materials. Ammonium alginate serves not only as a carbon source but also as a dispersant for Ni2+ and Co2+, facilitating the formation of NixCo1-xS2 solid solution. The composite has a sheets structure of NixCo1-xS2 nanoparticles decorated with porous carbon. The composition of NixCo1-xS2 could be easily controlled by adjusting the amount of Ni2+ and Co2+ salts. The NixCo1-xS2@porous carbon composites present the specific capacitance of 1569.9 F g−1 at 1 A g−1. The NixCo1-xS2@porous carbon//AC asymmetric supercapacitor was also tested, showing high energy density of 30.5 Wh kg−1 at a power density of 350 W kg−1, and excellent cycling stability with capacitance retention of 67.1% over 10,000 cycles. The excellent electrochemical performance is attributed to its composition and structure. The NixCo1-xS2 solid solution could provide rich redox reactions, improved electronic conductivity and enhanced cycling stability. The three-dimensional mesoporous carbon structure within the composite promotes electron transfer, ion diffusion, and enhances the cycling stability of NixCo1-xS2.
提高硫化镍的倍率性能和循环稳定性是提高超级电容器能量密度的有效策略。在这项工作中,我们开发了一种简单,廉价,高产的策略,以Ni2+, Co2+和生物质海藻酸铵为原料制备NixCo1-xS2@porous碳复合材料。海藻酸铵不仅作为碳源,而且作为Ni2+和Co2+的分散剂,促进NixCo1-xS2固溶体的形成。该复合材料具有多孔碳修饰的NixCo1-xS2纳米颗粒片状结构。通过调整Ni2+和Co2+盐的用量,可以很容易地控制NixCo1-xS2的组成。NixCo1-xS2@porous碳复合材料在1ag−1时的比电容为1569.9 F g−1。NixCo1-xS2@porous碳//交流不对称超级电容器在350 W kg - 1的功率密度下具有30.5 Wh kg - 1的高能量密度,并且具有良好的循环稳定性,在10,000次循环中电容保持率为67.1%。优异的电化学性能是由其组成和结构决定的。NixCo1-xS2固溶体可以提供丰富的氧化还原反应,提高电子导电性和增强循环稳定性。复合材料内三维介孔碳结构促进了电子转移、离子扩散,增强了NixCo1-xS2的循环稳定性。
{"title":"Facile synthesis of NixCo1-xS2 nanoparticles decorated with biomass-derived porous carbon sheets for supercapacitor electrodes","authors":"Feng Zhang , Haiying Guo , Minjia Ni , Na Li , Liangbo Xia , Xiuying Wang , Xiaoyi Chen","doi":"10.1016/j.jelechem.2026.119824","DOIUrl":"10.1016/j.jelechem.2026.119824","url":null,"abstract":"<div><div>The improvement of rate performance and cycling stability of nickel sulfides is an effective strategy to improve the energy density of supercapacitors. In this work, we developed a simple, cheap, and high-yield strategy to fabricate Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub>@porous carbon composites by using Ni<sup>2+</sup>, Co<sup>2+</sup> and biomass ammonium alginate as raw materials. Ammonium alginate serves not only as a carbon source but also as a dispersant for Ni<sup>2+</sup> and Co<sup>2+</sup>, facilitating the formation of Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub> solid solution. The composite has a sheets structure of Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub> nanoparticles decorated with porous carbon. The composition of Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub> could be easily controlled by adjusting the amount of Ni<sup>2+</sup> and Co<sup>2+</sup> salts. The Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub>@porous carbon composites present the specific capacitance of 1569.9 F g<sup>−1</sup> at 1 A g<sup>−1</sup>. The Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub>@porous carbon//AC asymmetric supercapacitor was also tested, showing high energy density of 30.5 Wh kg<sup>−1</sup> at a power density of 350 W kg<sup>−1</sup>, and excellent cycling stability with capacitance retention of 67.1% over 10,000 cycles. The excellent electrochemical performance is attributed to its composition and structure. The Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub> solid solution could provide rich redox reactions, improved electronic conductivity and enhanced cycling stability. The three-dimensional mesoporous carbon structure within the composite promotes electron transfer, ion diffusion, and enhances the cycling stability of Ni<sub>x</sub>Co<sub>1-x</sub>S<sub>2</sub>.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119824"},"PeriodicalIF":4.1,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922268","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 : 2026-01-08DOI: 10.1016/j.jelechem.2026.119794
Jiaheng Zhao , Huichun Kang , Yue Li, Qiwei Feng, Hui Peng, Ziqiang Lei
Covalent triazine frameworks (CTFs) have shown broad application prospects in the oxygen reduction reaction (ORR) due to their well-defined molecular structure, highly tunable pore characteristics, large specific surface area, customizable active sites, and excellent physicochemical stability. However, their catalytic performance is still limited by the limited number of active sites and slow charge transfer kinetics. This study proposes an innovative strategy to construct electron-rich regions by introducing pyridine units into the stable CTF1 framework and systematically adjusting its electronic properties through functional group engineering, thereby precisely controlling the local structure of CTFs. Specifically, we utilize the electron-donating properties of methyl groups (–CH₃) and the electron-withdrawing properties of fluorine atoms (F) to finely tune the electron density, dipole moment, and adsorption affinity for oxygen intermediates of the pyridine structure. Based on this strategy, we successfully prepared three covalent triazine framework derivative nanosheets (CTFd-NSs), including CTF–CH₃, CTF–2CP, and CTF–F. Electrochemical test results show that CTF–F exhibits the best ORR performance, with a half-wave potential (E₁/₂) of 0.72 V, an onset potential (Eonset) of 0.83 V (vs. RHE), and a Tafel slope of 64.7 mV·dec−1, which is a significant improvement compared to the original CTF1 (E₁/₂ = 0.64 V) and is significantly better than most reported similar materials. This study provides a new approach for precisely controlling the electronic microenvironment of porous organic frameworks and highlights the effectiveness of enhancing electrocatalytic performance through local structural modification.
{"title":"A study on a local structural regulation strategy for covalent triazine frameworks and their electrocatalytic oxygen reduction performance","authors":"Jiaheng Zhao , Huichun Kang , Yue Li, Qiwei Feng, Hui Peng, Ziqiang Lei","doi":"10.1016/j.jelechem.2026.119794","DOIUrl":"10.1016/j.jelechem.2026.119794","url":null,"abstract":"<div><div>Covalent triazine frameworks (CTFs) have shown broad application prospects in the oxygen reduction reaction (ORR) due to their well-defined molecular structure, highly tunable pore characteristics, large specific surface area, customizable active sites, and excellent physicochemical stability. However, their catalytic performance is still limited by the limited number of active sites and slow charge transfer kinetics. This study proposes an innovative strategy to construct electron-rich regions by introducing pyridine units into the stable CTF1 framework and systematically adjusting its electronic properties through functional group engineering, thereby precisely controlling the local structure of CTFs. Specifically, we utilize the electron-donating properties of methyl groups (–CH₃) and the electron-withdrawing properties of fluorine atoms (<img>F) to finely tune the electron density, dipole moment, and adsorption affinity for oxygen intermediates of the pyridine structure. Based on this strategy, we successfully prepared three covalent triazine framework derivative nanosheets (CTFd-NSs), including CTF–CH₃, CTF–2CP, and CTF–F. Electrochemical test results show that CTF–F exhibits the best ORR performance, with a half-wave potential (E₁/₂) of 0.72 V, an onset potential (E<sub>onset</sub>) of 0.83 V (vs. RHE), and a Tafel slope of 64.7 mV·dec<sup>−1</sup>, which is a significant improvement compared to the original CTF1 (E₁/₂ = 0.64 V) and is significantly better than most reported similar materials. This study provides a new approach for precisely controlling the electronic microenvironment of porous organic frameworks and highlights the effectiveness of enhancing electrocatalytic performance through local structural modification.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119794"},"PeriodicalIF":4.1,"publicationDate":"2026-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973494","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 : 2026-01-07DOI: 10.1016/j.jelechem.2026.119805
Siyu Zhang , Mingtao Ding , Runfeng Song , Lili Yang , Dan Lv , Jingyi Luan , Wenbin Hu , Cheng Zhong
Silicon emerges as a promising anode material for lithium-ion batteries (LIBs), which is capable of affording a high theoretical specific capacity and a low working potential. However, the prospective anode material suffers from quite serious volume expansion, bad electrical conductivity and expensive costs, thereby hindering the commercial application of Si electrodes. In this work, a carbon‑silicon composite (CSPC@Si@C) was synthesized by using low-cost raw materials and it possessed an optimistic electrochemical performance. Firstly, corn stalks were adopted to fabricate a highly porous carbon substrate through ferric nitrate combined with water steam activation. Subsequently, nano-Si particles were deposited into the carbon substrate via thermal decomposition of silane. The procedure was finally followed by a carbon coating through the chemical vapor deposition (CVD) with the carbon source of methane. Benefiting from the porous structure and large specific surface area of the carbon substrate, the transportation rate of Li+ can be facilitated and the large volume expansion can be buffered. Conclusively, the electrochemical results show that CSPC@Si@C presents a high specific capacity of 789.6 mAh g−1 at 0.2C (300 mA g−1) after 100 cycles, delivering a superior capacity retention of 70.2%. Moreover, the corresponding CSPC@Si@C//LiNi0.8Co0.1Mn0.1O2 (NCM811) full cell gives rise to an outstanding long-term cycling stability, maintaining a reversible capacity of 67.7 mAh g−1 after cycling with the capacity retention of 64.9%.
硅具有较高的理论比容量和较低的工作电势,是锂离子电池极具发展前景的负极材料。然而,未来的负极材料存在体积膨胀严重、导电性差、成本昂贵等问题,阻碍了硅电极的商业化应用。本文采用低成本原料合成了碳硅复合材料(CSPC@Si@C),该材料具有良好的电化学性能。首先,以玉米秸秆为原料,采用硝酸铁结合水蒸气活化法制备高孔碳基;随后,通过硅烷的热分解将纳米硅颗粒沉积到碳衬底中。最后,以甲烷为碳源,通过化学气相沉积(CVD)进行碳涂层。得益于碳基的多孔结构和较大的比表面积,可以促进Li+的运输速率,缓冲大体积膨胀。最后,电化学结果表明CSPC@Si@C在0.2C (300 mA g−1)下循环100次后具有789.6 mAh g−1的高比容量,容量保持率为70.2%。此外,相应的CSPC@Si@C//LiNi0.8Co0.1Mn0.1O2 (NCM811)充满电池具有出色的长期循环稳定性,循环后保持67.7 mAh g−1的可逆容量,容量保持率为64.9%。
{"title":"A corn stalks-derived porous carbon‑silicon composite as lithium-ion battery anode materials","authors":"Siyu Zhang , Mingtao Ding , Runfeng Song , Lili Yang , Dan Lv , Jingyi Luan , Wenbin Hu , Cheng Zhong","doi":"10.1016/j.jelechem.2026.119805","DOIUrl":"10.1016/j.jelechem.2026.119805","url":null,"abstract":"<div><div>Silicon emerges as a promising anode material for lithium-ion batteries (LIBs), which is capable of affording a high theoretical specific capacity and a low working potential. However, the prospective anode material suffers from quite serious volume expansion, bad electrical conductivity and expensive costs, thereby hindering the commercial application of Si electrodes. In this work, a carbon‑silicon composite (CSPC@Si@C) was synthesized by using low-cost raw materials and it possessed an optimistic electrochemical performance. Firstly, corn stalks were adopted to fabricate a highly porous carbon substrate through ferric nitrate combined with water steam activation. Subsequently, nano-Si particles were deposited into the carbon substrate via thermal decomposition of silane. The procedure was finally followed by a carbon coating through the chemical vapor deposition (CVD) with the carbon source of methane. Benefiting from the porous structure and large specific surface area of the carbon substrate, the transportation rate of Li<sup>+</sup> can be facilitated and the large volume expansion can be buffered. Conclusively, the electrochemical results show that CSPC@Si@C presents a high specific capacity of 789.6 mAh g<sup>−1</sup> at 0.2C (300 mA g<sup>−1</sup>) after 100 cycles, delivering a superior capacity retention of 70.2%. Moreover, the corresponding CSPC@Si@C//LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (NCM811) full cell gives rise to an outstanding long-term cycling stability, maintaining a reversible capacity of 67.7 mAh g<sup>−1</sup> after cycling with the capacity retention of 64.9%.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119805"},"PeriodicalIF":4.1,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922200","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 : 2026-01-07DOI: 10.1016/j.jelechem.2026.119822
Nesreen Almadani , Ata-ur-Rehman , Safyan Akram Khan , Shahid Ali , Muhammad Mansha , Muhammad Nawaz Tahir , Majad Khan
Poly(isobutylene-alt-maleic anhydride) (PIMA) was chemically engineered into a redox-active polymer electrolyte via an amidation reaction using 3-picolylamine, resulting in PPIMA. The subsequent quaternization using acetic anhydride, 4-(chloromethyl)benzonitrile, and 3-propane sultone generated modified versions, including PAPIMA, PCNPIMA, and PSPIMA, respectively. These modifications further modulate the polarity, electron density, and ion-transport pathways in aqueous redox-flow batteries (RFBs). FTIR, 1H NMR, and TGA verified the chemical structures of the transformed polymers. The quantitative integration yielded high substitution levels such as PPIMA ≈100%, PSPIMA ≈96%, PCNPIMA ≈83%, and PAPIMA ≈55% per repeat unit. Electrochemical behavior was assessed through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in 1.0 M KOH, and the charging-discharging profiles of these polymeric electrolytes (anolytes) were validated in a 5.06 cm2 laboratory RF cell containing a separator of Nafion® N424, electrodes of activated graphite felts, and K4[Fe(CN)6] as a catholyte. Under galvanostatic testing, PPIMA delivered the highest discharge capacity, 119 mAh g−1, while PSPIMA and PCNPIMA each reached ∼102 mAh g−1, and PAPIMA achieved 96 mAh g−1. PAPIMA and PPIMA exhibited high coulombic efficiencies, approaching 100% at low current density and remaining stable up to 80 mA. All polymers exhibited robust cycling over 500 cycles at 100 mA. The results trend maps directly onto substituent electronics and sterics: pyridyl groups enhance delocalization and site accessibility (PPIMA), sulfonates boost hydrophilicity but add steric drag (PSPIMA), nitriles withdraw electron density (PCNPIMA), and acetylation moderates redox activity (PAPIMA). Moreover, to gain deeper insight into the electronic and steric effects of substituent modifications on the electrochemical behavior, we performed density functional theory (DFT) calculations using Materials Studio DMol3. These results establish rational backbone/pendant engineering of PIMA as a viable route to durable, high-efficiency aqueous polymer electrolytes for RFBs.
聚异丁烯-马来酸酐(PIMA)通过3-吡咯胺的酰胺化反应被化学修饰成具有氧化还原活性的聚合物电解质,从而得到了PIMA。随后使用乙酸酐、4-(氯甲基)苯腈和3-丙烷磺酮进行季铵盐季铵化反应,分别生成了PAPIMA、PCNPIMA和PSPIMA。这些修饰进一步调节了水氧化还原液流电池(rfb)的极性、电子密度和离子传输途径。FTIR, 1H NMR和TGA验证了转化聚合物的化学结构。定量积分得到PPIMA≈100%、PSPIMA≈96%、PCNPIMA≈83%、PAPIMA≈55%的高取代水平。通过循环伏安法(CV)和电化学阻抗谱(EIS)在1.0 M KOH下评估电化学行为,并在5.06 cm2的实验室RF电池中验证这些聚合物电解质(阳极液)的充放电曲线,该电池含有Nafion®N424分离器,活性石墨毛条电极,K4[Fe(CN)6]作为阴极。在恒流测试中,PPIMA的放电容量最高,达到119 mAh g - 1,而PSPIMA和PCNPIMA分别达到~ 102 mAh g - 1, PAPIMA达到96 mAh g - 1。PAPIMA和PPIMA表现出很高的库仑效率,在低电流密度下接近100%,并且在80ma下保持稳定。所有聚合物在100 mA下均表现出500次以上的稳健循环。结果直接映射到取代基电子学和立体构型上:吡啶基增强了离域和位点可及性(PPIMA),磺酸盐增强了亲水性但增加了空间阻力(PSPIMA),腈基降低了电子密度(PCNPIMA),乙酰化降低了氧化还原活性(PAPIMA)。此外,为了更深入地了解取代基修饰对电化学行为的电子和立体效应,我们使用Materials Studio DMol3进行了密度泛函理论(DFT)计算。这些结果表明,合理的PIMA骨架/悬垂工程是制备耐用、高效的rfb聚合物电解质的可行途径。
{"title":"Chemical modulation of redox polymers for high-performance aqueous redox flow batteries","authors":"Nesreen Almadani , Ata-ur-Rehman , Safyan Akram Khan , Shahid Ali , Muhammad Mansha , Muhammad Nawaz Tahir , Majad Khan","doi":"10.1016/j.jelechem.2026.119822","DOIUrl":"10.1016/j.jelechem.2026.119822","url":null,"abstract":"<div><div>Poly(isobutylene-<em>alt</em>-maleic anhydride) (<strong>PIMA</strong>) was chemically engineered into a redox-active polymer electrolyte via an amidation reaction using 3-picolylamine, resulting in <strong>PPIMA</strong>. The subsequent quaternization using acetic anhydride, 4-(chloromethyl)benzonitrile, and 3-propane sultone generated modified versions, including <strong>PAPIMA</strong>, <strong>PCNPIMA</strong>, and <strong>PSPIMA</strong>, respectively. These modifications further modulate the polarity, electron density, and ion-transport pathways in aqueous redox-flow batteries (RFBs). FTIR, <sup>1</sup>H NMR, and TGA verified the chemical structures of the transformed polymers. The quantitative integration yielded high substitution levels such as <strong>PPIMA</strong> ≈100%, <strong>PSPIMA</strong> ≈96%, <strong>PCNPIMA</strong> ≈83%, and <strong>PAPIMA</strong> ≈55% per repeat unit. Electrochemical behavior was assessed through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in 1.0 M KOH, and the charging-discharging profiles of these polymeric electrolytes (anolytes) were validated in a 5.06 cm<sup>2</sup> laboratory RF cell containing a separator of Nafion® N424, electrodes of activated graphite felts, and K<sub>4</sub>[Fe(CN)<sub>6</sub>] as a catholyte. Under galvanostatic testing, <strong>PPIMA</strong> delivered the highest discharge capacity, 119 mAh g<sup>−1</sup>, while <strong>PSPIMA</strong> and <strong>PCNPIMA</strong> each reached ∼102 mAh g<sup>−1,</sup> and <strong>PAPIMA</strong> achieved 96 mAh g<sup>−1</sup>. <strong>PAPIMA</strong> and <strong>PPIMA</strong> exhibited high coulombic efficiencies, approaching 100% at low current density and remaining stable up to 80 mA. All polymers exhibited robust cycling over 500 cycles at 100 mA. The results trend maps directly onto substituent electronics and sterics: pyridyl groups enhance delocalization and site accessibility (<strong>PPIMA</strong>), sulfonates boost hydrophilicity but add steric drag (<strong>PSPIMA</strong>), nitriles withdraw electron density (<strong>PCNPIMA</strong>), and acetylation moderates redox activity (<strong>PAPIMA</strong>). Moreover, to gain deeper insight into the electronic and steric effects of substituent modifications on the electrochemical behavior, we performed density functional theory (DFT) calculations using Materials Studio DMol<sup>3</sup>. These results establish rational backbone/pendant engineering of <strong>PIMA</strong> as a viable route to durable, high-efficiency aqueous polymer electrolytes for RFBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119822"},"PeriodicalIF":4.1,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922201","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 : 2026-01-07DOI: 10.1016/j.jelechem.2026.119806
Juan Wu, Xiaoran Ren, Kai Huang, Bencai Lin
This study develops composite polymer electrolytes (CPEs) by incorporating polydopamine-modified ZIF-8 (PDA@ZIF-8) and an ionic liquid (IL), 1-butyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide ([BMIM][TFSI]), into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrices to reduce interfacial resistance and enhance battery stability. Leveraging ZIF-8's nanoporous structure, PDA's adhesion properties, and synergistic PDA-PVDF-HFP interactions, the PDA@ZIF-8 filler achieves uniform dispersion while preserving its integrity and improving polymer-filler compatibility. Compared to CPEs without PDA@ZIF-8 (ionic conductivity: 1.66 × 10−4 S cm−1 at 25 °C), those containing an optimal amount of PDA@ZIF-8 exhibit significantly higher conductivity. Specifically, the PH/[email protected] membrane achieves a conductivity of 2.09 × 10−4 S cm−1 at 25 °C. Furthermore, PDA@ZIF-8 incorporation substantially enhances the CPEs' mechanical properties. Owing to the excellent Li-salt dissociation capabilities of both the IL and PDA@ZIF-8, the PH/[email protected] membrane demonstrates a high Li+ transference number of 0.54. Li|PH/[email protected]|Li symmetric cells maintain a low steady-state overpotential for over 600 h. Moreover, LiFePO4|PH/[email protected]|Li batteries deliver a discharge capacity of 132 mAh g−1 and retain over 98 % capacity after 100 cycles under 0.1C at 25 °C, highlighting their strong potential for lithium-ion battery applications. This work provides an effective strategy for preparing high-performance CPEs that enhance lithium-ion battery performance.
本研究通过将聚多巴胺修饰的ZIF-8 (PDA@ZIF-8)和离子液体(IL) 1-丁基-3-甲基咪唑双(三氟甲烷磺酰)亚胺([BMIM][TFSI])加入聚偏氟乙烯-共六氟丙烯(PVDF-HFP)基质中,开发复合聚合物电解质(cpe),以降低界面阻力,提高电池稳定性。利用ZIF-8的纳米孔结构、PDA的粘附性能和PDA- pvdf - hfp的协同相互作用,PDA@ZIF-8填料在保持其完整性和提高聚合物填料相容性的同时实现了均匀分散。与不含PDA@ZIF-8(25°C时离子电导率为1.66 × 10−4 S cm−1)的cpe相比,含有最佳量PDA@ZIF-8的cpe电导率显著提高。具体来说,PH/[email protected]膜在25°C时的电导率为2.09 × 10−4 S cm−1。此外,PDA@ZIF-8的掺入大大提高了cpe的力学性能。由于IL和PDA@ZIF-8具有优异的锂盐解离能力,PH/[email protected]膜具有0.54的高锂离子转移数。此外,LiFePO4|PH/[email protected]|锂电池在25°C下0.1C循环100次后,放电容量可达132 mAh g - 1,并保持98%以上的容量,突出了其在锂离子电池应用中的强大潜力。这项工作为制备高性能cpe提供了一种有效的策略,可以提高锂离子电池的性能。
{"title":"Poly(vinylidene fluoride-co-hexafluoropropylene)/ionic liquid/polydopamine-modified metal-organic framework composite polymer electrolytes for lithium-ion batteries","authors":"Juan Wu, Xiaoran Ren, Kai Huang, Bencai Lin","doi":"10.1016/j.jelechem.2026.119806","DOIUrl":"10.1016/j.jelechem.2026.119806","url":null,"abstract":"<div><div>This study develops composite polymer electrolytes (CPEs) by incorporating polydopamine-modified ZIF-8 (PDA@ZIF-8) and an ionic liquid (IL), 1-butyl-3-methylimidazolium bis (trifluoromethanesulfonyl) imide ([BMIM][TFSI]), into poly(vinylidene fluoride-<em>co</em>-hexafluoropropylene) (PVDF-HFP) matrices to reduce interfacial resistance and enhance battery stability. Leveraging ZIF-8's nanoporous structure, PDA's adhesion properties, and synergistic PDA-PVDF-HFP interactions, the PDA@ZIF-8 filler achieves uniform dispersion while preserving its integrity and improving polymer-filler compatibility. Compared to CPEs without PDA@ZIF-8 (ionic conductivity: 1.66 × 10<sup>−4</sup> S cm<sup>−1</sup> at 25 °C), those containing an optimal amount of PDA@ZIF-8 exhibit significantly higher conductivity. Specifically, the PH/[email protected] membrane achieves a conductivity of 2.09 × 10<sup>−4</sup> S cm<sup>−1</sup> at 25 °C. Furthermore, PDA@ZIF-8 incorporation substantially enhances the CPEs' mechanical properties. Owing to the excellent Li-salt dissociation capabilities of both the IL and PDA@ZIF-8, the PH/[email protected] membrane demonstrates a high Li<sup>+</sup> transference number of 0.54. Li|PH/[email protected]|Li symmetric cells maintain a low steady-state overpotential for over 600 h. Moreover, LiFePO<sub>4</sub>|PH/[email protected]|Li batteries deliver a discharge capacity of 132 mAh g<sup>−1</sup> and retain over 98 % capacity after 100 cycles under 0.1C at 25 °C, highlighting their strong potential for lithium-ion battery applications. This work provides an effective strategy for preparing high-performance CPEs that enhance lithium-ion battery performance.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119806"},"PeriodicalIF":4.1,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975384","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 : 2026-01-06DOI: 10.1016/j.jelechem.2026.119793
Hüseyin Oğuzhan Kaya , Yamaç Tekintaş , Fatma Kurul , Turku Acıkgoz , Seda Nur Topkaya
Morganella morganii is an emerging opportunistic pathogen associated with urinary tract infections, yet no selective biosensing platform has been reported for its rapid detection. In this study, we present the first molecularly imprinted polymer (MIP)-based electrochemical biosensor specifically tailored for M. morganii, enabling label-free, highly selective, and low-cost detection. The sensor was fabricated by electropolymerizing phenol in the presence of whole-cell bacteria on pencil graphite electrodes, followed by template removal to generate specific recognition cavities. Successful imprinting and selective rebinding were verified by electrochemical impedance spectroscopy and cyclic voltammetry.
The biosensor demonstrated a low LOD of 3.0 CFU/mL in real urine, excellent linearity (R2 > 0.99), and high reproducibility (RSD < 10 %), confirming robust analytical performance. Notably, the sensor maintained high sensitivity in complex urine matrices, indicating strong matrix tolerance. Selectivity studies showed imprinting factors of 4.5–10.1 against E. coli, K. pneumoniae, S. aureus, and E. faecalis, confirming excellent discrimination capability. The biosensor retained >95 % of its initial response for 3 days and ∼ 56 % after 14 days, demonstrating satisfactory stability.
Compared to conventional microbiological and molecular assays, this MIP-based platform offers a rapid and label-free strategy for early detection of M. morganii in urinary tract infection diagnostics.
{"title":"Label-free molecularly imprinted polymer–based impedimetric biosensor for rapid detection of Morganella morganii in real samples","authors":"Hüseyin Oğuzhan Kaya , Yamaç Tekintaş , Fatma Kurul , Turku Acıkgoz , Seda Nur Topkaya","doi":"10.1016/j.jelechem.2026.119793","DOIUrl":"10.1016/j.jelechem.2026.119793","url":null,"abstract":"<div><div><strong><em>Morganella morganii</em></strong> is an emerging opportunistic pathogen associated with urinary tract infections, yet no selective biosensing platform has been reported for its rapid detection. In this study, we present the first molecularly imprinted polymer (MIP)-based electrochemical biosensor specifically tailored for <strong><em>M. morganii,</em></strong> enabling label-free, highly selective, and low-cost detection. The sensor was fabricated by electropolymerizing phenol in the presence of whole-cell bacteria on pencil graphite electrodes, followed by template removal to generate specific recognition cavities. Successful imprinting and selective rebinding were verified by electrochemical impedance spectroscopy and cyclic voltammetry<strong>.</strong></div><div>The biosensor demonstrated a low LOD of 3.0 CFU/mL in real urine<strong>,</strong> excellent linearity (R<sup>2</sup> > 0.99), and high reproducibility (RSD < 10 %), confirming robust analytical performance. Notably, the sensor maintained high sensitivity in complex urine matrices, indicating strong matrix tolerance<strong>.</strong> Selectivity studies showed imprinting factors of 4.5–10.1 against <em>E. coli, K. pneumoniae, S. aureus,</em> and <em>E. faecalis</em>, confirming excellent discrimination capability. The biosensor retained >95 % of its initial response for 3 days and ∼ 56 % after 14 days<strong>,</strong> demonstrating satisfactory stability.</div><div>Compared to conventional microbiological and molecular assays, this MIP-based platform offers a rapid and label-free strategy for early detection of <em>M. morganii</em> in urinary tract infection diagnostics.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119793"},"PeriodicalIF":4.1,"publicationDate":"2026-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145922199","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}