Pub Date : 2026-03-15Epub Date: 2026-01-25DOI: 10.1016/j.jelechem.2026.119875
Guanjun Chen, Long Chen, Zheming Huang, Kaiwen Yang, Jiayi Yang, Tong Wang, Jin Zhang, Ke Zhang
The rational design of Pt-based electrocatalysts with high carbon monoxide tolerance is essential for advancing the sustainable development of direct methanol fuel cells (DMFCs). To address this challenge, a ternary composite comprising Pt nanocrystals, nickel-doped cobalt carbonate hydroxide (NiCoCH) and porous carbon was constructed. The designed Pt-based ternary catalyst exhibits outstanding methanol oxidation reaction (MOR) performance, which is attributed to the kinetic promotion of water activation for the formation of OH species by Ni doping in carbonate hydroxide, the three-dimensional spatial network structure and the optimized synergistic catalysis. Specifically, it delivers a remarkable MOR mass activity of 1465.5 mA∙mg−1, which is 2.1 times greater than that of commercial Pt/C (672.3 mA∙mg−1). And over 55% of the initial activity was maintained after 3000 s of chronoamperometry testing. Notably, the onset potential for CO oxidation on the ternary catalyst is observed at 0.15 V, significantly lower than the 0.33 V recorded for Pt/C, indicating substantially enhanced CO tolerance. This study offers key design principles for developing high-performance MOR electrocatalysts.
{"title":"CO-tolerant Pt-based ternary spatial network catalyst for efficient methanol electro-oxidation","authors":"Guanjun Chen, Long Chen, Zheming Huang, Kaiwen Yang, Jiayi Yang, Tong Wang, Jin Zhang, Ke Zhang","doi":"10.1016/j.jelechem.2026.119875","DOIUrl":"10.1016/j.jelechem.2026.119875","url":null,"abstract":"<div><div>The rational design of Pt-based electrocatalysts with high carbon monoxide tolerance is essential for advancing the sustainable development of direct methanol fuel cells (DMFCs). To address this challenge, a ternary composite comprising Pt nanocrystals, nickel-doped cobalt carbonate hydroxide (NiCoCH) and porous carbon was constructed. The designed Pt-based ternary catalyst exhibits outstanding methanol oxidation reaction (MOR) performance, which is attributed to the kinetic promotion of water activation for the formation of OH species by Ni doping in carbonate hydroxide, the three-dimensional spatial network structure and the optimized synergistic catalysis. Specifically, it delivers a remarkable MOR mass activity of 1465.5 mA∙mg<sup>−1</sup>, which is 2.1 times greater than that of commercial Pt/C (672.3 mA∙mg<sup>−1</sup>). And over 55% of the initial activity was maintained after 3000 s of chronoamperometry testing. Notably, the onset potential for CO oxidation on the ternary catalyst is observed at 0.15 V, significantly lower than the 0.33 V recorded for Pt/C, indicating substantially enhanced CO tolerance. This study offers key design principles for developing high-performance MOR electrocatalysts.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119875"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075344","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 : 2026-03-15Epub Date: 2026-01-22DOI: 10.1016/j.jelechem.2026.119870
Meng Sun , Guanting Liu , Shujin Hao , Feiyu Diao , Federico Rosei , Rongsheng Cai , Yiqian Wang
Recent studies have shown that spinel ferrites featuring unique spinel structures are promising as anode materials in lithium-ion batteries (LIBs) because of their high capacity, low cost, and abundant resources. However, the influence of the spinel structure on the electrochemical properties of spinel ferrites is still poorly understood. Herein, three different spinel ferrites, namely, normal spinel ZnFe2O4, mixed spinel MgFe2O4, and inverse spinel CoFe2O4 nanofibers are prepared by electrospinning, aiming to correlate the spinel structure with their electrochemical kinetic behavior. It is found that the spinel type of spinel ferrites is associated with the initial voltage platform in the discharge process and reaction kinetics. As an anode for LIBs, the ZFO electrode demonstrates the highest initial voltage platform and superior lithium-ion transport capability. This is mainly attributed to the large proportion of Fe3+ occupying octahedral sites in the normal spinel, which facilitates the migration of lithium ions into the lattice of the anode. This work advances the understanding of the effects of spinel structure on the battery performance, enabling the targeted synthesis of optimized materials for enhanced performance of LIBs.
{"title":"Correlation between spinel structure and electrochemical kinetic behavior of spinel ferrites","authors":"Meng Sun , Guanting Liu , Shujin Hao , Feiyu Diao , Federico Rosei , Rongsheng Cai , Yiqian Wang","doi":"10.1016/j.jelechem.2026.119870","DOIUrl":"10.1016/j.jelechem.2026.119870","url":null,"abstract":"<div><div>Recent studies have shown that spinel ferrites featuring unique spinel structures are promising as anode materials in lithium-ion batteries (LIBs) because of their high capacity, low cost, and abundant resources. However, the influence of the spinel structure on the electrochemical properties of spinel ferrites is still poorly understood. Herein, three different spinel ferrites, namely, normal spinel ZnFe<sub>2</sub>O<sub>4</sub>, mixed spinel MgFe<sub>2</sub>O<sub>4</sub>, and inverse spinel CoFe<sub>2</sub>O<sub>4</sub> nanofibers are prepared by electrospinning, aiming to correlate the spinel structure with their electrochemical kinetic behavior. It is found that the spinel type of spinel ferrites is associated with the initial voltage platform in the discharge process and reaction kinetics. As an anode for LIBs, the ZFO electrode demonstrates the highest initial voltage platform and superior lithium-ion transport capability. This is mainly attributed to the large proportion of Fe<sup>3+</sup> occupying octahedral sites in the normal spinel, which facilitates the migration of lithium ions into the lattice of the anode. This work advances the understanding of the effects of spinel structure on the battery performance, enabling the targeted synthesis of optimized materials for enhanced performance of LIBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119870"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036937","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 : 2026-03-15Epub Date: 2026-01-20DOI: 10.1016/j.jelechem.2026.119845
Yifeng Guo , Zhaomeng Wu , Hangtong Zhao , Xiaoguang Wu , Guofeng Chang , Yang Wang , Xiaochen Xu , Shaobin Yang , Wei Dong
Cellulose powder (CA) was employed as the raw material and dissolved in a NaOH/urea aqueous solvent system at low temperatures to form a three-dimensional gel network. Nickel nitrate was simultaneously introduced as the nickel source during this process. The resulting gel underwent freeze-drying, followed by gradient pyrolysis and acid washing treatments, to achieve uniform dispersion of nickel nanoparticles within the nitrogen-doped carbon skeleton. Notably, the urea dissolution system was innovatively utilized to synchronously accomplish nitrogen doping and metal anchoring. Optimizing the loading amount of nickel nanoparticles led to the successful preparation of a carbon aerogel cathode material, denoted as 2Ni/NUCA. This material demonstrated exceptional electrochemical performance in lithium sulfur batteries. The three dimensionally cross-linked fibrous carbon network significantly enhanced electrical conductivity by shortening the charge transport pathways and effectively accommodated the volume expansion of sulfur. Furthermore, the uniformly dispersed nickel nanoparticles substantially accelerated the redox kinetics of polysulfides through interfacial catalytic effects. The 2Ni/NUCA/S electrode achieved an initial discharge specific capacity of 605.0 mAh/g at a current density of 4C. It maintained a capacity of 487.9 mAh/g after 800 cycles, corresponding to a high capacity retention of 80.6%. The average capacity decay per cycle was as low as 0.024%.
{"title":"Nickel nanoparticles embedded in nitrogen doped cellulose derived carbon aerogel for enhanced cycling stability of Lithium Sulfur batteries via synergistic porous and catalytic interfaces","authors":"Yifeng Guo , Zhaomeng Wu , Hangtong Zhao , Xiaoguang Wu , Guofeng Chang , Yang Wang , Xiaochen Xu , Shaobin Yang , Wei Dong","doi":"10.1016/j.jelechem.2026.119845","DOIUrl":"10.1016/j.jelechem.2026.119845","url":null,"abstract":"<div><div>Cellulose powder (CA) was employed as the raw material and dissolved in a NaOH/urea aqueous solvent system at low temperatures to form a three-dimensional gel network. Nickel nitrate was simultaneously introduced as the nickel source during this process. The resulting gel underwent freeze-drying, followed by gradient pyrolysis and acid washing treatments, to achieve uniform dispersion of nickel nanoparticles within the nitrogen-doped carbon skeleton. Notably, the urea dissolution system was innovatively utilized to synchronously accomplish nitrogen doping and metal anchoring. Optimizing the loading amount of nickel nanoparticles led to the successful preparation of a carbon aerogel cathode material, denoted as 2Ni/NUCA. This material demonstrated exceptional electrochemical performance in lithium sulfur batteries. The three dimensionally cross-linked fibrous carbon network significantly enhanced electrical conductivity by shortening the charge transport pathways and effectively accommodated the volume expansion of sulfur. Furthermore, the uniformly dispersed nickel nanoparticles substantially accelerated the redox kinetics of polysulfides through interfacial catalytic effects. The 2Ni/NUCA/S electrode achieved an initial discharge specific capacity of 605.0 mAh/g at a current density of 4C. It maintained a capacity of 487.9 mAh/g after 800 cycles, corresponding to a high capacity retention of 80.6%. The average capacity decay per cycle was as low as 0.024%.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119845"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036940","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 : 2026-03-15Epub Date: 2026-01-16DOI: 10.1016/j.jelechem.2026.119836
Mehdi Hamze, Davoud Fatmehsari Haghshenas
Due to the increasing amount of spent NiCd batteries, their efficient recycling is essential to reduce the environmental risks and recycle valuable metals. Hereunder, a hydro-electrometallurgical process was proposed for the recycling Cd from spent NiCd batteries by developing a novel non-precious CoFe2O4 anode. After near-complete dissolution of Cd (∼57 g/L) and Ni (∼71 g/L) by sulfuric acid leaching (2 M, 90 °C, 2 h) and, Fe precipitation by pH adjustment (∼5), Cd electrowinning from the leaching solution was carried out using CoFe2O4 as the anode. The CoFe2O4 anode, prepared through thermal decomposition at 550 °C, exhibited enhanced electrocatalytic activity and durability over conventional Pb anodes, with a ∼ 250 mV decrease in overpotential and a ∼ 35-fold increase in electrochemical surface area. High performance and 25-day operational stability under acidic conditions (pH = 1) were confirmed through linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and long-term chronopotentiometry. Electrowinning at 5 mA/cm2 and with sodium lauryl sulfate (SLS) additive (250 mg/L) produced Cd deposits with 99.99% purity and ∼ 100% current efficiency. The developed anode promisingly provides a green and scalable alternative to conventional Pb-based anodes in metal electrowinning processes.
{"title":"Evaluating a non-precious anode (CoFe2O4) for cadmium electrowinning from leaching solution of spent Nicd batteries","authors":"Mehdi Hamze, Davoud Fatmehsari Haghshenas","doi":"10.1016/j.jelechem.2026.119836","DOIUrl":"10.1016/j.jelechem.2026.119836","url":null,"abstract":"<div><div>Due to the increasing amount of spent Ni<img>Cd batteries, their efficient recycling is essential to reduce the environmental risks and recycle valuable metals. Hereunder, a hydro-electrometallurgical process was proposed for the recycling Cd from spent Ni<img>Cd batteries by developing a novel non-precious CoFe<sub>2</sub>O<sub>4</sub> anode. After near-complete dissolution of Cd (∼57 g/L) and Ni (∼71 g/L) by sulfuric acid leaching (2 M, 90 °C, 2 h) and, Fe precipitation by pH adjustment (∼5), Cd electrowinning from the leaching solution was carried out using CoFe<sub>2</sub>O<sub>4</sub> as the anode. The CoFe<sub>2</sub>O<sub>4</sub> anode, prepared through thermal decomposition at 550 °C, exhibited enhanced electrocatalytic activity and durability over conventional Pb anodes, with a ∼ 250 mV decrease in overpotential and a ∼ 35-fold increase in electrochemical surface area. High performance and 25-day operational stability under acidic conditions (pH = 1) were confirmed through linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and long-term chronopotentiometry. Electrowinning at 5 mA/cm<sup>2</sup> and with sodium lauryl sulfate (SLS) additive (250 mg/L) produced Cd deposits with 99.99% purity and ∼ 100% current efficiency. The developed anode promisingly provides a green and scalable alternative to conventional Pb-based anodes in metal electrowinning processes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119836"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075345","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 : 2026-03-15Epub Date: 2026-01-18DOI: 10.1016/j.jelechem.2026.119841
Weilin Liu , Kaijing Zhao , Xin Wan , Shiyu Lu , Yongjiang Di , Shuai Long , Cheng Zhang , Meng Jin , Jun Zhang , Peng Peng
The oxygen evolution reaction (OER) is a core half-reaction in clean energy technologies like water splitting, and the development of high-efficiency OER catalysts is critical for overcoming the energy conversion efficiency bottleneck. The development of efficient OER catalysts based on metal-embedded porous carbon nanofibers (CNFs) is often hampered by complex synthesis procedures. This study presents a phosphoric acid-mediated synthesis strategy for fabricating FeCo bimetallic nanoalloys anchored on nitrogen-doped porous carbon nanofibers (FeCo@N-PCNFs). By integrating phosphoric acid with polyvinyl alcohol (PVA), a stabilized carbon framework is formed, enabling homogeneous dispersion of FeCo nanoparticles. Hierarchical porosity is simultaneously generated through PTFE decomposition during pyrolysis. The optimized FeCo@N-PCNFs demonstrate superior OER performance in 1 M KOH, requiring an overpotential of 273 mV to reach 10 mA cm−2, outperforming commercial RuO2 (320 mV). The catalyst maintains 91.4% of its initial current over 32 h, with enhanced charge transfer kinetics (Rct = 0.77 Ω). This method simplifies the synthesis of porous carbon-based electrocatalysts while achieving high activity and durability.
析氧反应（OER）是水裂解等清洁能源技术中的核心半反应，开发高效的OER催化剂是克服能量转化效率瓶颈的关键。基于金属包埋多孔碳纳米纤维（CNFs）的高效OER催化剂的开发经常受到复杂的合成过程的阻碍。本研究提出了一种磷酸介导的合成策略，用于制造锚定在氮掺杂多孔碳纳米纤维上的FeCo双金属纳米合金（FeCo@N-PCNFs）。通过将磷酸与聚乙烯醇（PVA）结合，形成稳定的碳框架，使FeCo纳米颗粒均匀分散。在热解过程中，聚四氟乙烯分解同时产生分层孔隙。优化后的FeCo@N-PCNFs在1 M KOH下表现出优异的OER性能，需要273 mV的过电位才能达到10 mA cm - 2，优于商用RuO2 （320 mV）。催化剂在32小时内保持了91.4%的初始电流，并增强了电荷转移动力学（Rct = 0.77 Ω）。该方法简化了多孔碳基电催化剂的合成，同时实现了高活性和耐用性。
{"title":"Phosphoric acid-assisted synthesis of FeCo nanoalloys in N-doped carbon fibers toward high-efficiency oxygen evolution reaction","authors":"Weilin Liu , Kaijing Zhao , Xin Wan , Shiyu Lu , Yongjiang Di , Shuai Long , Cheng Zhang , Meng Jin , Jun Zhang , Peng Peng","doi":"10.1016/j.jelechem.2026.119841","DOIUrl":"10.1016/j.jelechem.2026.119841","url":null,"abstract":"<div><div>The oxygen evolution reaction (OER) is a core half-reaction in clean energy technologies like water splitting, and the development of high-efficiency OER catalysts is critical for overcoming the energy conversion efficiency bottleneck. The development of efficient OER catalysts based on metal-embedded porous carbon nanofibers (CNFs) is often hampered by complex synthesis procedures. This study presents a phosphoric acid-mediated synthesis strategy for fabricating FeCo bimetallic nanoalloys anchored on nitrogen-doped porous carbon nanofibers (FeCo@N-PCNFs). By integrating phosphoric acid with polyvinyl alcohol (PVA), a stabilized carbon framework is formed, enabling homogeneous dispersion of FeCo nanoparticles. Hierarchical porosity is simultaneously generated through PTFE decomposition during pyrolysis. The optimized FeCo@N-PCNFs demonstrate superior OER performance in 1 M KOH, requiring an overpotential of 273 mV to reach 10 mA cm<sup>−2</sup>, outperforming commercial RuO<sub>2</sub> (320 mV). The catalyst maintains 91.4% of its initial current over 32 h, with enhanced charge transfer kinetics (R<sub>ct</sub> = 0.77 Ω). This method simplifies the synthesis of porous carbon-based electrocatalysts while achieving high activity and durability.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119841"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036924","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}
Cobalt-based electrocatalysts show promising potential for water splitting, yet the efficiency of the electrochemical process is primarily impeded by the slow kinetics of the oxygen evolution reaction (OER). Developing highly active and stable non-precious metal OER electrocatalysts is therefore of great importance. In this work, the Pv-CoP/NF nanorod arrays with numerous crystalline-amorphous interfaces are fabricated by NaBH4 etching. Enhanced electrocatalytic performance is achieved by this heterostructure through a merger of the crystalline phase's excellent electrical conductivity and the amorphous domains' plentiful defect sites, which collectively improve the electronic structure. The Pv-CoP/NF catalyst exhibits excellent bifunctional activity in alkaline electrolyte, requiring low overpotentials of only 60 mV for the hydrogen evolution reaction (HER) and 198 mV for the OER at a current density of 10 mA cm−2. The assembled water-splitting device requires only 1.49 V to reach the current density of 10 mA cm−2. This study offers a feasible strategy for designing efficient non-precious metal electrocatalysts, contributing to the advancement of sustainable energy conversion technologies.
钴基电催化剂在水分解方面表现出良好的潜力，但电化学过程的效率主要受到析氧反应（OER）缓慢动力学的阻碍。因此，开发高活性、稳定的非贵金属OER电催化剂具有重要意义。本文采用NaBH4刻蚀法制备了具有多个晶态-非晶态界面的Pv-CoP/NF纳米棒阵列。这种异质结构通过晶体相优异的导电性和非晶畴丰富的缺陷位点的结合，从而提高了电催化性能，共同改善了电子结构。Pv-CoP/NF催化剂在碱性电解质中表现出优异的双功能活性，在电流密度为10 mA cm−2时，析氢反应（HER）和OER的过电位分别为60 mV和198 mV。组装后的水分解装置仅需1.49 V电流即可达到10ma cm−2的电流密度。本研究为设计高效的非贵金属电催化剂提供了可行的策略，有助于推动可持续能源转换技术的发展。
{"title":"Etching-engineered defects in crystalline-amorphous cobalt phosphides for efficient overall water splitting","authors":"Yiming Huang, Yahui Song, Xinyue Li, Jihui Zhang, Kaiming Cheng","doi":"10.1016/j.jelechem.2026.119833","DOIUrl":"10.1016/j.jelechem.2026.119833","url":null,"abstract":"<div><div>Cobalt-based electrocatalysts show promising potential for water splitting, yet the efficiency of the electrochemical process is primarily impeded by the slow kinetics of the oxygen evolution reaction (OER). Developing highly active and stable non-precious metal OER electrocatalysts is therefore of great importance. In this work, the Pv-CoP/NF nanorod arrays with numerous crystalline-amorphous interfaces are fabricated by NaBH<sub>4</sub> etching. Enhanced electrocatalytic performance is achieved by this heterostructure through a merger of the crystalline phase's excellent electrical conductivity and the amorphous domains' plentiful defect sites, which collectively improve the electronic structure. The Pv-CoP/NF catalyst exhibits excellent bifunctional activity in alkaline electrolyte, requiring low overpotentials of only 60 mV for the hydrogen evolution reaction (HER) and 198 mV for the OER at a current density of 10 mA cm<sup>−2</sup>. The assembled water-splitting device requires only 1.49 V to reach the current density of 10 mA cm<sup>−2</sup>. This study offers a feasible strategy for designing efficient non-precious metal electrocatalysts, contributing to the advancement of sustainable energy conversion technologies.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119833"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036846","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 : 2026-03-15Epub Date: 2026-01-15DOI: 10.1016/j.jelechem.2026.119834
Pervaiz Ahmad , Niaz Ahmad Niaz , Rimsha Shehzadi , Awais Khalid , Fawad Ali Shah , Fayyaz Hussain
Developing a low cost and highly efficient noble metal free electrocatalyst for water splitting applications has drawn a lot of attention. MXenes, a novel 2D materials have been researched due to these characteristics such as increased catalytic activity, excellent metallic conductivity, superior hydrophility, huge surface area and high thermal stability. MoS2, a typical 2D transition metal dichalcogenide has been studied for OER, because of following properties like excellent catalytic activity, high density of catalytically active edge sites, layered structure, large specific surface area and less volume expansion. The combination of MXene (Ti3C2) with MoS2 was attributed to good electrocatalytic performance by effective integration, where MoS2 rises surface area and inhibits MXene from restacking. The 2% Ti3C2/MoS2 electrocatalyst demonstrates a minimum overpotential (246 mV), a small Tafel slope (73 mV dec−1), large electrochemical surface area and long-term durability than other electrocatalysts, which highlights outstanding OER performance. DFT simulations showed that the Ti3C2/MoS2 heterostructure has a lower Gibbs free energy barrier for OER, which suggests efficient charge transfer efficiency and strong active site interactions. This study provides valuable insights to create an effective electrocatalysts through water splitting for OER, utilizing non-noble metals for sustainable hydrogen production.
{"title":"Synergistic MXene/MoS2 hybrid Electrocatalyst with enhanced oxygen evolution activity for efficient water splitting","authors":"Pervaiz Ahmad , Niaz Ahmad Niaz , Rimsha Shehzadi , Awais Khalid , Fawad Ali Shah , Fayyaz Hussain","doi":"10.1016/j.jelechem.2026.119834","DOIUrl":"10.1016/j.jelechem.2026.119834","url":null,"abstract":"<div><div>Developing a low cost and highly efficient noble metal free electrocatalyst for water splitting applications has drawn a lot of attention. MXenes, a novel 2D materials have been researched due to these characteristics such as increased catalytic activity, excellent metallic conductivity, superior hydrophility, huge surface area and high thermal stability. MoS<sub>2</sub>, a typical 2D transition metal dichalcogenide has been studied for OER, because of following properties like excellent catalytic activity, high density of catalytically active edge sites, layered structure, large specific surface area and less volume expansion. The combination of MXene (Ti<sub>3</sub>C<sub>2</sub>) with MoS<sub>2</sub> was attributed to good electrocatalytic performance by effective integration, where MoS<sub>2</sub> rises surface area and inhibits MXene from restacking. The 2% Ti<sub>3</sub>C<sub>2</sub>/MoS<sub>2</sub> electrocatalyst demonstrates a minimum overpotential (246 mV), a small Tafel slope (73 mV dec<sup>−1</sup>), large electrochemical surface area and long-term durability than other electrocatalysts, which highlights outstanding OER performance. DFT simulations showed that the Ti<sub>3</sub>C<sub>2</sub>/MoS<sub>2</sub> heterostructure has a lower Gibbs free energy barrier for OER, which suggests efficient charge transfer efficiency and strong active site interactions. This study provides valuable insights to create an effective electrocatalysts through water splitting for OER, utilizing non-noble metals for sustainable hydrogen production.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119834"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036925","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 : 2026-03-15Epub Date: 2026-01-18DOI: 10.1016/j.jelechem.2026.119840
Shuang Yang , Junyi You , Yukui Tong, Fang Chai, Miaomiao Tian
A dual-mode (ratiometric electrochemical and colorimetric) sensor for acetaminophen (ACM) was successfully developed using novel functional monomers: iron-coordinated 5-aminophenaminophenanthroline (PAP) and 3,4-ethylenedioxythiophene (EDOT). The PAP monomer played a dual role; it facilitated specific molecular recognition of ACM through coordination interactions while simultaneously serving as an intrinsic electrochemical signal source via the Fe2+/Fe3+ redox couple. This ingenious design established a self-referenced sensing system based on the monomer's inherent conductivity. An ACM-selective molecularly imprinted polymeric film was fabricated via electropolymerization. The optimized electrochemical sensor demonstrated excellent performance, featuring a wide linear detection range from 0.06 to 1000 μM, an ultra-low detection limit of 0.026 μM, and satisfactory recoveries between 96.7% and 103.9% in real sample analysis. In a complementary colorimetric mode, ACM'S inherent reducing capability triggered the reduction of oxidized TMB (OXTMB), producing a measurable color change. This integrated dual-platform strategy significantly enhances detection reliability through cross-validation and extends practical application scope, presenting a robust and versatile paradigm for analytical detection systems with considerable potential in food safety and health monitoring.
{"title":"Dual model ratiometric electrochemical/colorimetric sensor based on advanced signal amplification strategies for sensitive detection of acetaminophen","authors":"Shuang Yang , Junyi You , Yukui Tong, Fang Chai, Miaomiao Tian","doi":"10.1016/j.jelechem.2026.119840","DOIUrl":"10.1016/j.jelechem.2026.119840","url":null,"abstract":"<div><div>A dual-mode (ratiometric electrochemical and colorimetric) sensor for acetaminophen (ACM) was successfully developed using novel functional monomers: iron-coordinated 5-aminophenaminophenanthroline (PAP) and 3,4-ethylenedioxythiophene (EDOT). The PAP monomer played a dual role; it facilitated specific molecular recognition of ACM through coordination interactions while simultaneously serving as an intrinsic electrochemical signal source via the Fe<sup>2+</sup>/Fe<sup>3+</sup> redox couple. This ingenious design established a self-referenced sensing system based on the monomer's inherent conductivity. An ACM-selective molecularly imprinted polymeric film was fabricated via electropolymerization. The optimized electrochemical sensor demonstrated excellent performance, featuring a wide linear detection range from 0.06 to 1000 μM, an ultra-low detection limit of 0.026 μM, and satisfactory recoveries between 96.7% and 103.9% in real sample analysis. In a complementary colorimetric mode, ACM'S inherent reducing capability triggered the reduction of oxidized TMB (OXTMB), producing a measurable color change. This integrated dual-platform strategy significantly enhances detection reliability through cross-validation and extends practical application scope, presenting a robust and versatile paradigm for analytical detection systems with considerable potential in food safety and health monitoring.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119840"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036936","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 : 2026-03-15Epub Date: 2026-01-22DOI: 10.1016/j.jelechem.2026.119873
Egor A. Andreev , Anastasia I. Alekseeva , Baohua Lou , Arkady A. Karyakin
Human sweat is an appealing biofluid for nonintrusive assessment of health condition. It contains a wide range of biomarkers (electrolytes, metabolites, nutrients, polypeptides, proteins and so on) providing valuable information about body tissues and organ functions. This mini review surveys possible sweat induction strategies above and beyond common ones with focus on their main advantages and disadvantages related to elaboration of wearable devices and opportunity of continuous monitoring. Despite the progress in sweat sensing, microelectronics, engineering, and data handling together with marketing commercial patches, truly diagnostic wearable devices are still matter of future research. A possible obstacle may originate from the fact that most procedures of sweating activation remain conservative. Addressing main features of broader range of different sweat activation approaches is expected to promote research on innovative sampling and possibly on new generation of wearable sensors.
{"title":"A mini review on sweat activation: common and uncommon strategies","authors":"Egor A. Andreev , Anastasia I. Alekseeva , Baohua Lou , Arkady A. Karyakin","doi":"10.1016/j.jelechem.2026.119873","DOIUrl":"10.1016/j.jelechem.2026.119873","url":null,"abstract":"<div><div>Human sweat is an appealing biofluid for nonintrusive assessment of health condition. It contains a wide range of biomarkers (electrolytes, metabolites, nutrients, polypeptides, proteins and so on) providing valuable information about body tissues and organ functions. This mini review surveys possible sweat induction strategies above and beyond common ones with focus on their main advantages and disadvantages related to elaboration of wearable devices and opportunity of continuous monitoring. Despite the progress in sweat sensing, microelectronics, engineering, and data handling together with marketing commercial patches, truly diagnostic wearable devices are still matter of future research. A possible obstacle may originate from the fact that most procedures of sweating activation remain conservative. Addressing main features of broader range of different sweat activation approaches is expected to promote research on innovative sampling and possibly on new generation of wearable sensors.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119873"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036847","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 : 2026-03-15Epub Date: 2026-01-20DOI: 10.1016/j.jelechem.2026.119844
Yi Zhang , Hongcheng Xu , Churen Wang , Ziqiang Li , Gongyuan Zhao , Dengfeng Yu , Chunxia Chen
Aqueous zinc‑iodine batteries (AZIBs) stand out as promising next-generation energy storage devices due to their cost-effectiveness and intrinsic safety. However, their practical application is severely hindered by sluggish iodine conversion kinetics, the shuttling effect of polyiodides, and limited achievable iodine mass loading (typically <2 mg cm−2). To address these challenges, this work reports a novel modified separator (denoted as BN-rGO@GF) fabricated by coating a glass fiber GF substrate with a porous boron nitride-reduced graphene oxide (BN-rGO) composite. The BN-rGO layer endows the separator with dual physical adsorption and chemical catalytic capabilities: it effectively immobilizes soluble polyiodides to suppress the shuttle effect while accelerating the redox conversion kinetics of iodine species. Consequently, the AZIBs utilizing BN-rGO@GF as the separator deliver an ultrahigh discharge capacity (208.7 mAh g−1 at a current density of 0.1 A g−1) and maintain an excellent capacity retention rate of up to 85% over 2600 cycles. Notably, an outstanding capacity of 141.9 mAh g−1 is achieved even at an ultrahigh mass loading of 15 mg cm−2, demonstrating remarkable potential for practical application. This work provides an effective design strategy for modified separators and offers new insights into advancing high-performance AZIBs.
水性锌碘电池（azib）因其成本效益和内在安全性而成为有前途的下一代储能设备。然而，它们的实际应用受到碘转化动力学缓慢、多碘化物的穿梭效应和可实现的碘质量负载有限（通常为2mg cm - 2）的严重阻碍。为了解决这些挑战，本研究报告了一种新型改性分离器（表示为BN-rGO@GF），该分离器通过在玻璃纤维GF衬底上涂覆多孔氮化硼还原氧化石墨烯（BN-rGO）复合材料制成。BN-rGO层赋予了分离器双重物理吸附和化学催化能力：它有效地固定了可溶性多碘化物，抑制了穿梭效应，同时加速了碘种的氧化还原转化动力学。因此，利用BN-rGO@GF作为分离器的azib提供了超高的放电容量（在0.1 a g−1的电流密度下为208.7 mAh g−1），并且在2600次循环中保持了高达85%的优异容量保持率。值得注意的是，即使在15 mg cm - 2的超高质量负载下，也能达到141.9 mAh g - 1的出色容量，显示出显着的实际应用潜力。这项工作为改进分离器提供了有效的设计策略，并为推进高性能azib提供了新的见解。
{"title":"A BN-rGO modified separator enabling synergistic shuttle suppression toward high-mass-loading aqueous zinc‑iodine batteries","authors":"Yi Zhang , Hongcheng Xu , Churen Wang , Ziqiang Li , Gongyuan Zhao , Dengfeng Yu , Chunxia Chen","doi":"10.1016/j.jelechem.2026.119844","DOIUrl":"10.1016/j.jelechem.2026.119844","url":null,"abstract":"<div><div>Aqueous zinc‑iodine batteries (AZIBs) stand out as promising next-generation energy storage devices due to their cost-effectiveness and intrinsic safety. However, their practical application is severely hindered by sluggish iodine conversion kinetics, the shuttling effect of polyiodides, and limited achievable iodine mass loading (typically <2 mg cm<sup>−2</sup>). To address these challenges, this work reports a novel modified separator (denoted as BN-rGO@GF) fabricated by coating a glass fiber GF substrate with a porous boron nitride-reduced graphene oxide (BN-rGO) composite. The BN-rGO layer endows the separator with dual physical adsorption and chemical catalytic capabilities: it effectively immobilizes soluble polyiodides to suppress the shuttle effect while accelerating the redox conversion kinetics of iodine species. Consequently, the AZIBs utilizing BN-rGO@GF as the separator deliver an ultrahigh discharge capacity (208.7 mAh g<sup>−1</sup> at a current density of 0.1 A g<sup>−1</sup>) and maintain an excellent capacity retention rate of up to 85% over 2600 cycles. Notably, an outstanding capacity of 141.9 mAh g<sup>−1</sup> is achieved even at an ultrahigh mass loading of 15 mg cm<sup>−2</sup>, demonstrating remarkable potential for practical application. This work provides an effective design strategy for modified separators and offers new insights into advancing high-performance AZIBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119844"},"PeriodicalIF":4.1,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036939","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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