Pub 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":"2026-01-16","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}
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":"2026-01-16","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 : 2026-01-15DOI: 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":"2026-01-15","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 : 2026-01-14DOI: 10.1016/j.jelechem.2026.119832
Wenhui Zhang , Rong Zhong , Jiake Li , Hedong Jiang , Xin Liu , Pingchun Guo , Hua Zhu , Yanxiang Wang
Aqueous zinc-ion batteries (AZIBs) have emerged as a leading option in energy storage devices. However, issues such as the solvation structure of [Zn (H2O) 6]2+, water-rich interfaces, and interface instability have led to hydrogen evolution reactions (HER), corrosion, and dendrite growth, hindering their application and development. In this paper, the conventional ZnSO4 electrolyte was modified using 3-aminopropionitrile fumarate (3-Af) as an additive. Experimental and theoretical calculation results indicate that the carboxyl groups in 3-Af strongly interact with H2O, accelerating the desolvation process of Zn2+ and reducing the occurrence of active water decomposition. Additionally, 3-Af adsorbed onto the zinc anode surface forms a stable interface layer and regulates Zn2+ flux to achieve uniform deposition, thereby effectively inhibiting dendrite formation. Under the synergistic mechanism, the Zn//Zn symmetric battery assembled with the 3-Af-containing electrolyte (10 mM) exhibits the stable cycling for 2540 h and 810 h at current densities of 1.0 mA cm−2 and 5.0 mA cm−2, respectively, which are 22 and 30 times than those of the Zn//Zn symmetric battery with ZnSO4 electrolyte, respectively. The Zn//Ti asymmetric battery with the 3-Af-containing electrolyte (10 mM) has the stable cycling 670 cycles at 1.0 mA cm−2, which is nearly 30 times higher than that with ZnSO4 electrolyte. The Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) achieves a specific capacity of 172.8 mAh g−1 at a current density of 0.2 A g−1, whereas the specific capacity is 140.0 mAh g−1with ZnSO4 electrolyte. Moreover, the Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) shows the specific capacity rate of 77.1% after 10,000 cycles at 5.0 mA cm−2, which increases by 17.8% than that with ZnSO4 electrolyte. Therefore, this work paves a new way for the development of low-cost and long-life AZIBs.
水锌离子电池（azib）已成为能源存储设备的主要选择。然而，[Zn (H2O) 6]2+的溶剂化结构、富水界面和界面不稳定性等问题导致了析氢反应（HER）、腐蚀和枝晶生长，阻碍了它们的应用和发展。本文以富马酸3-氨基丙腈（3-Af）为添加剂对传统的ZnSO4电解质进行了改性。实验和理论计算结果表明，3-Af中的羧基与H2O发生强烈的相互作用，加速了Zn2+的脱溶过程，减少了活性水分解的发生。另外，吸附在锌阳极表面的3-Af形成稳定的界面层，调节Zn2+通量，实现均匀沉积，从而有效抑制枝晶的形成。在协同作用下，含3- af电解质（10 mM）组装的Zn//Zn对称电池在电流密度分别为1.0 mA cm - 2和5.0 mA cm - 2时的稳定循环时间分别为2540 h和810 h，是含ZnSO4电解质的Zn//Zn对称电池的22倍和30倍。含3- af电解质（10 mM）的Zn/ Ti不对称电池在1.0 mA cm−2下稳定循环670次，比含ZnSO4电解质的电池高近30倍。在0.2 a g−1电流密度下，含3- af （10 mM）电解液的Zn//I₂电池的比容量为172.8 mAh g−1，而含ZnSO4电解液的比容量为140.0 mAh g−1。在5.0 mA cm−2下，含3- af （10 mM）电解质的Zn//I₂电池在10000次循环后的比容量率为77.1%，比含ZnSO4电解质的电池提高了17.8%。因此，本研究为低成本、长寿命azib的开发开辟了一条新的道路。
{"title":"Ultralong-life zinc-ion batteries enabled by a multifunctional aqueous electrolyte additive","authors":"Wenhui Zhang , Rong Zhong , Jiake Li , Hedong Jiang , Xin Liu , Pingchun Guo , Hua Zhu , Yanxiang Wang","doi":"10.1016/j.jelechem.2026.119832","DOIUrl":"10.1016/j.jelechem.2026.119832","url":null,"abstract":"<div><div>Aqueous zinc-ion batteries (AZIBs) have emerged as a leading option in energy storage devices. However, issues such as the solvation structure of [Zn (H<sub>2</sub>O) <sub>6</sub>]<sup>2+</sup>, water-rich interfaces, and interface instability have led to hydrogen evolution reactions (HER), corrosion, and dendrite growth, hindering their application and development. In this paper, the conventional ZnSO<sub>4</sub> electrolyte was modified using 3-aminopropionitrile fumarate (3-Af) as an additive. Experimental and theoretical calculation results indicate that the carboxyl groups in 3-Af strongly interact with H<sub>2</sub>O, accelerating the desolvation process of Zn<sup>2+</sup> and reducing the occurrence of active water decomposition. Additionally, 3-Af adsorbed onto the zinc anode surface forms a stable interface layer and regulates Zn<sup>2+</sup> flux to achieve uniform deposition, thereby effectively inhibiting dendrite formation. Under the synergistic mechanism, the Zn//Zn symmetric battery assembled with the 3-Af-containing electrolyte (10 mM) exhibits the stable cycling for 2540 h and 810 h at current densities of 1.0 mA cm<sup>−2</sup> and 5.0 mA cm<sup>−2</sup>, respectively, which are 22 and 30 times than those of the Zn//Zn symmetric battery with ZnSO<sub>4</sub> electrolyte, respectively. The Zn//Ti asymmetric battery with the 3-Af-containing electrolyte (10 mM) has the stable cycling 670 cycles at 1.0 mA cm<sup>−2</sup>, which is nearly 30 times higher than that with ZnSO<sub>4</sub> electrolyte. The Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) achieves a specific capacity of 172.8 mAh g<sup>−1</sup> at a current density of 0.2 A g<sup>−1</sup>, whereas the specific capacity is 140.0 mAh g<sup>−1</sup>with ZnSO<sub>4</sub> electrolyte. Moreover, the Zn//I₂ battery with the 3-Af-containing electrolyte (10 mM) shows the specific capacity rate of 77.1% after 10,000 cycles at 5.0 mA cm<sup>−2</sup>, which increases by 17.8% than that with ZnSO<sub>4</sub> electrolyte. Therefore, this work paves a new way for the development of low-cost and long-life AZIBs.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119832"},"PeriodicalIF":4.1,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146036927","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 : 2026-01-13DOI: 10.1016/j.jelechem.2026.119799
Zahra Kasipour Rasteh kenari , Ahmad Ahmadi Daryakenari , Arash Montazeri , Farshad Boorboor Ajdari , Mohammad Mahdi Kasipour
Developing high-performance, durable, and cost-effective electrocatalysts for the oxygen evolution reaction (OER) is pivotal for green hydrogen generation. In this research, the elctrocatalysts of the NiO nanostructures are directly electrodeposited onto a graphite substrate through a facile and binder-free anodic strategy. It was found that the applied deposition potential is a powerful electrochemical parameter to control the morphology, defect density, and the OER efficiency of the obtained NiO layers. The electrodeposition process, when performed at an optimized potential of 2.0 V, fabricates very tiny NiO nanoparticles that possess a high density of oxygen vacancies. This electrode fabricated at 2.0 V exhibits a proper OER activity in alkaline media, acquiring a high current density of 324 mA·cm−2 at 1.8 V vs. RHE. After 24-h stability testing, the NiO-2 V electrode maintained a current density of ∼200 mA/cm2 at 1.65 V vs. RHE, significantly outperforming the NiO-1 V electrode, which stabilized at only ∼10 mA/cm2.
{"title":"Scalable anodic electrodeposition of efficient binder-free NiO electrocatalysts for water oxidation","authors":"Zahra Kasipour Rasteh kenari , Ahmad Ahmadi Daryakenari , Arash Montazeri , Farshad Boorboor Ajdari , Mohammad Mahdi Kasipour","doi":"10.1016/j.jelechem.2026.119799","DOIUrl":"10.1016/j.jelechem.2026.119799","url":null,"abstract":"<div><div>Developing high-performance, durable, and cost-effective electrocatalysts for the oxygen evolution reaction (OER) is pivotal for green hydrogen generation. In this research, the elctrocatalysts of the NiO nanostructures are directly electrodeposited onto a graphite substrate through a facile and binder-free anodic strategy. It was found that the applied deposition potential is a powerful electrochemical parameter to control the morphology, defect density, and the OER efficiency of the obtained NiO layers. The electrodeposition process, when performed at an optimized potential of 2.0 V, fabricates very tiny NiO nanoparticles that possess a high density of oxygen vacancies. This electrode fabricated at 2.0 V exhibits a proper OER activity in alkaline media, acquiring a high current density of 324 mA·cm<sup>−2</sup> at 1.8 V vs. RHE. After 24-h stability testing, the NiO-2 V electrode maintained a current density of ∼200 mA/cm<sup>2</sup> at 1.65 V vs. RHE, significantly outperforming the NiO-1 V electrode, which stabilized at only ∼10 mA/cm<sup>2</sup>.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119799"},"PeriodicalIF":4.1,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076390","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 : 2026-01-11DOI: 10.1016/j.jelechem.2026.119829
Weifeng Zhang , Jiasheng Huang , Yu Li , Yuan Yao , Jiawei Zhang , Minghua Chen
High-capacitance capacitive-type electrodes are essential for achieving high energy density in asymmertric supercapacitor. Herein, a trace Ni doping strategy is proposed to improve energy storage performance of the capacitive-type octahedral WO3 electrode. The Ni doped WO3 electrode with a 4% doping concentration exhibits the optimal energy storage performance, with an superior areal specific capacitance of 4206 mF cm−2 at 10 mA cm−2, significantly higher than that of pure WO3 (910 mF cm−2). The significantly enhanced capacitance resulting from Ni doping may be attributed to the highly symmetric octahedral crystal structure of WO3, which readily activates Jahn-Teller effects, thereby effectively altering the electronic structure and improving electrochemical performance. To explore the practical potential of the Ni doped WO3, the asymmetric supercapacitor using polypyrrole as the counter electrode is assembled and achieves a maximum capacitance of 313.8 mF cm−2, corresponding to the energy density of 72.3 μWh cm−2 at a power density of 2.6 mW cm−2. This work highlights the relationship between cation doping and crystal structure, offering a promising strategy to enhance the electrochemical performance of capacitive-type electrodes.
高容量电容型电极是实现非对称超级电容器高能量密度的关键。为了提高电容型八面体WO3电极的储能性能，提出了微量Ni掺杂策略。掺杂浓度为4%的镍掺杂WO3电极表现出最佳的储能性能，在10 mA cm−2时的面比电容达到4206 mF cm−2，显著高于纯WO3电极（910 mF cm−2）。Ni掺杂后WO3的电容显著增强可能是由于WO3具有高度对称的八面体晶体结构，极易激活Jahn-Teller效应，从而有效地改变了电子结构，提高了电化学性能。为了探索Ni掺杂WO3的实用潜力，以聚吡咯为对电极组装了不对称超级电容器，在2.6 mW cm - 2的功率密度下，其最大电容为313.8 mF cm - 2，能量密度为72.3 μWh cm - 2。这项工作强调了阳离子掺杂与晶体结构之间的关系，为提高电容型电极的电化学性能提供了一种有前途的策略。
{"title":"Trace Ni doping-enhanced capacitive WO3 electrode for high-energy-density asymmetric supercapacitors","authors":"Weifeng Zhang , Jiasheng Huang , Yu Li , Yuan Yao , Jiawei Zhang , Minghua Chen","doi":"10.1016/j.jelechem.2026.119829","DOIUrl":"10.1016/j.jelechem.2026.119829","url":null,"abstract":"<div><div>High-capacitance capacitive-type electrodes are essential for achieving high energy density in asymmertric supercapacitor. Herein, a trace Ni doping strategy is proposed to improve energy storage performance of the capacitive-type octahedral WO<sub>3</sub> electrode. The Ni doped WO<sub>3</sub> electrode with a 4% doping concentration exhibits the optimal energy storage performance, with an superior areal specific capacitance of 4206 mF cm<sup>−2</sup> at 10 mA cm<sup>−2</sup>, significantly higher than that of pure WO<sub>3</sub> (910 mF cm<sup>−2</sup>). The significantly enhanced capacitance resulting from Ni doping may be attributed to the highly symmetric octahedral crystal structure of WO<sub>3</sub>, which readily activates Jahn-Teller effects, thereby effectively altering the electronic structure and improving electrochemical performance. To explore the practical potential of the Ni doped WO<sub>3</sub>, the asymmetric supercapacitor using polypyrrole as the counter electrode is assembled and achieves a maximum capacitance of 313.8 mF cm<sup>−2</sup>, corresponding to the energy density of 72.3 μWh cm<sup>−2</sup> at a power density of 2.6 mW cm<sup>−2</sup>. This work highlights the relationship between cation doping and crystal structure, offering a promising strategy to enhance the electrochemical performance of capacitive-type electrodes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119829"},"PeriodicalIF":4.1,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145950401","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}
Four water-soluble viologen derivatives (NPr-Tdz, SPr-Tdz, SBu-Tdz, and OHPr-Tdz) with thiadiazole bridge were designed and synthesized to obtain yellow-colored Electrochromic Materials (ECMs). The compounds were thoroughly characterized using NMR spectroscopy and high-resolution mass spectrometry (HRMS). DFT calculations demonstrated that the incorporation of a thiadiazole moiety extended conjugation, lowered LUMO energy levels, and modulated HOMO-LUMO gaps. Electrochromic devices (ECDs) fabricated with these materials showed high optical contrast (ΔT > 50%) and tunable colouration, ranging from yellow-green to yellow-orange hues, influenced by side-chain functionalities. The retention rate of all ECDs based on NPr-Tdz, SPr-Tdz, SBu-Tdz, and OHPr-Tdz exceed 60% after 1000 cycles, indicating that the gel devices fabricated using the four Tdz derivatives as electrochromic materials have relatively stable applications in the visible light range.
{"title":"Strategic side-chain engineering of thiadiazole-bridged viologen derivatives for aqueous electrochromic applications","authors":"Ximo Wang, Yu Gao, Xiaojie Li, Xuejiao Sun, Dongmei Li, Zhongzhen Tian","doi":"10.1016/j.jelechem.2026.119830","DOIUrl":"10.1016/j.jelechem.2026.119830","url":null,"abstract":"<div><div>Four water-soluble viologen derivatives (<strong>NPr-Tdz</strong>, <strong>SPr-Tdz</strong>, <strong>SBu-Tdz</strong>, and <strong>OHPr-Tdz</strong>) with thiadiazole bridge were designed and synthesized to obtain yellow-colored Electrochromic Materials (ECMs). The compounds were thoroughly characterized using NMR spectroscopy and high-resolution mass spectrometry (HRMS). DFT calculations demonstrated that the incorporation of a thiadiazole moiety extended conjugation, lowered LUMO energy levels, and modulated HOMO-LUMO gaps. Electrochromic devices (ECDs) fabricated with these materials showed high optical contrast (ΔT > 50%) and tunable colouration, ranging from yellow-green to yellow-orange hues, influenced by side-chain functionalities. The retention rate of all ECDs based on <strong>NPr-Tdz</strong>, <strong>SPr-Tdz</strong>, <strong>SBu-Tdz</strong>, and <strong>OHPr-Tdz</strong> exceed 60% after 1000 cycles, indicating that the gel devices fabricated using the four <strong>Tdz</strong> derivatives as electrochromic materials have relatively stable applications in the visible light range.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119830"},"PeriodicalIF":4.1,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973496","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 : 2026-01-10DOI: 10.1016/j.jelechem.2025.119782
Karuppaiah Selvakumar , Muthuraj Arunpandian , Abdellatif M. Sadeq , Abdalrahman Alajmi , Tae Hwan Oh , Asma A. Alothman , Saikh Mohammad , Meenakshisundaram Swaminathan
{"title":"Corrigendum to “Ternary single metal atom oxides anchored on bimetal oxides for enhanced electrocatalytic oxygen evolution reaction in alkaline medium” [J. Electroanal. Chem. 981 (2025) 118963]","authors":"Karuppaiah Selvakumar , Muthuraj Arunpandian , Abdellatif M. Sadeq , Abdalrahman Alajmi , Tae Hwan Oh , Asma A. Alothman , Saikh Mohammad , Meenakshisundaram Swaminathan","doi":"10.1016/j.jelechem.2025.119782","DOIUrl":"10.1016/j.jelechem.2025.119782","url":null,"abstract":"","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1002 ","pages":"Article 119782"},"PeriodicalIF":4.1,"publicationDate":"2026-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146034413","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}
Hydrazine (HZ) is highly toxic and widely used in chemical industry which causes environmental pollution and even has negative impact to human health. The main objective of the study was to synthesize Sulfur doped graphitic carbon nitride (S-g-CN) and ZnO nanoparticles (NPs) for electrochemical detection of HZ. The S-g-CN/ZnO was prepared via sol gel-polymerization method. The synthesized material was characterized by techniques such as Ultraviolet-Visible (UV–Vis), X-ray diffraction (XRD), X-ray photoelectron (XPS), Fourier-transform infrared (FT-IR) and scanning electron microscopy (SEM) analysis. The S-g-CN/ZnO material combines the unique properties of S- g-C3N4 and ZnO to enhance the electrochemical performance for HZ detection. ZnO, known for its excellent electrochemical properties and stability, further enhances the detection sensitivity of the composite. The electrochemical performance of S-g-CN modified glassy carbon electrode (S-g-CN/GCE) and ZnO modified glassy carbon electrode (ZnO/GCE) were evaluated for HZ detection, comparing it to a bare GCE. Results demonstrate that the S-g-CN/ZnO nanocomposites (NCs) significantly improved the electrochemical detection of HZ, exhibiting enhanced sensitivity and selectivity compared to individual S-g-CN, ZnO, or the bare GCE. This improvement is attributed to the synergistic effect of sulfur doping and the composite formation, which increased the surface area, facilitated electron transfer, and provided more active sites, using square wave voltammetry (SWV) and showed a relatively low detection limit 0.083 μM (3σ/m) with a linear range of 0.250 μM to 80 μM and good sensitivity. Overall, S-g-CN/ZnO NCs is a suitable material for low-cost detection of HZ.
{"title":"Sulfur doped graphitic carbon nitride composite with zinc oxide for electrochemical determination of hydrazine","authors":"Alemnesh Bekele , Fuad Abduro Bushira , Alemayehu Yifru , Tadesse Haile Fereja , Shimeles Addisu Kitte","doi":"10.1016/j.jelechem.2026.119821","DOIUrl":"10.1016/j.jelechem.2026.119821","url":null,"abstract":"<div><div>Hydrazine (HZ) is highly toxic and widely used in chemical industry which causes environmental pollution and even has negative impact to human health. The main objective of the study was to synthesize Sulfur doped graphitic carbon nitride (S-g-CN) and ZnO nanoparticles (NPs) for electrochemical detection of HZ. The S-g-CN/ZnO was prepared via sol gel-polymerization method. The synthesized material was characterized by techniques such as Ultraviolet-Visible (UV–Vis), X-ray diffraction (XRD), X-ray photoelectron (XPS), Fourier-transform infrared (FT-IR) and scanning electron microscopy (SEM) analysis. The S-g-CN/ZnO material combines the unique properties of S- g-C<sub>3</sub>N<sub>4</sub> and ZnO to enhance the electrochemical performance for HZ detection. ZnO, known for its excellent electrochemical properties and stability, further enhances the detection sensitivity of the composite. The electrochemical performance of S-g-CN modified glassy carbon electrode (S-g-CN/GCE) and ZnO modified glassy carbon electrode (ZnO/GCE) were evaluated for HZ detection, comparing it to a bare GCE. Results demonstrate that the S-g-CN/ZnO nanocomposites (NCs) significantly improved the electrochemical detection of HZ, exhibiting enhanced sensitivity and selectivity compared to individual S-g-CN, ZnO, or the bare GCE. This improvement is attributed to the synergistic effect of sulfur doping and the composite formation, which increased the surface area, facilitated electron transfer, and provided more active sites, using square wave voltammetry (SWV) and showed a relatively low detection limit 0.083 μM (3σ/m) with a linear range of 0.250 μM to 80 μM and good sensitivity. Overall, S-g-CN/ZnO NCs is a suitable material for low-cost detection of HZ.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1004 ","pages":"Article 119821"},"PeriodicalIF":4.1,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145975382","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.2026.119828
Yang Jiang, Jijiang Huang, Jing Li, Yang Yang, Hongyan Xie
Lithium-rich Mn-based layered oxides are promising cathodes for next-generation high-energy-density lithium-ion batteries. However, their practical use is limited by rapid voltage fading and sluggish high-rate performance. Introducing high-valent dopants such as Nb5+ is expected to induce charge compensation and strengthen the local TM–O framework, thereby mitigating high-voltage degradation. Here we introduce Nb into cobalt-free Li1.2Mn0.6−xNbxNi0.2O2 (x = 0, 0.01, 0.02, 0.03) through a coprecipitation-compatible, water-assisted wet-grinding step followed by calcination, aiming to improve precursor-level mixing and enable controllable high-valent doping. Among the compositions, LLO-0.02Nb delivers the best overall performance, retaining 80% capacity after 200 cycles at 1C (vs. 78% for pristine LLO) and providing 163 and 142 mAh·g−1 at 5C and 10C, respectively, together with a reduced voltage-decay tendency (1.87 mV per cycle). After-cycling electrode analyses (XRD/SEM) reveal better preserved layered-related features and less severe surface degradation for the Nb-doped electrode. Surface spectroscopy (XPS/EPR) further indicates that Nb incorporation regulates the near-surface oxygen environment and transition-metal valence states via charge compensation. These results suggest that a mild Nb addition, enabled by a simple wet-assisted introduction route, can simultaneously enhance voltage stability, cycling durability, and rate capability of Li-rich Mn-based cathodes.
{"title":"Enhanced structural stability and electrochemical performance of niobium-doped Li-rich manganese-based cathode materials","authors":"Yang Jiang, Jijiang Huang, Jing Li, Yang Yang, Hongyan Xie","doi":"10.1016/j.jelechem.2026.119828","DOIUrl":"10.1016/j.jelechem.2026.119828","url":null,"abstract":"<div><div>Lithium-rich Mn-based layered oxides are promising cathodes for next-generation high-energy-density lithium-ion batteries. However, their practical use is limited by rapid voltage fading and sluggish high-rate performance. Introducing high-valent dopants such as Nb<sup>5+</sup> is expected to induce charge compensation and strengthen the local TM–O framework, thereby mitigating high-voltage degradation. Here we introduce Nb into cobalt-free Li<sub>1.2</sub>Mn<sub>0.6−x</sub>Nb<sub>x</sub>Ni<sub>0.2</sub>O<sub>2</sub> (x = 0, 0.01, 0.02, 0.03) through a coprecipitation-compatible, water-assisted wet-grinding step followed by calcination, aiming to improve precursor-level mixing and enable controllable high-valent doping. Among the compositions, LLO-0.02Nb delivers the best overall performance, retaining 80% capacity after 200 cycles at 1C (vs. 78% for pristine LLO) and providing 163 and 142 mAh·g<sup>−1</sup> at 5C and 10C, respectively, together with a reduced voltage-decay tendency (1.87 mV per cycle). After-cycling electrode analyses (XRD/SEM) reveal better preserved layered-related features and less severe surface degradation for the Nb-doped electrode. Surface spectroscopy (XPS/EPR) further indicates that Nb incorporation regulates the near-surface oxygen environment and transition-metal valence states via charge compensation. These results suggest that a mild Nb addition, enabled by a simple wet-assisted introduction route, can simultaneously enhance voltage stability, cycling durability, and rate capability of Li-rich Mn-based cathodes.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1003 ","pages":"Article 119828"},"PeriodicalIF":4.1,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145973495","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