Pub Date : 2026-04-15Epub Date: 2026-02-05DOI: 10.1016/j.jelechem.2026.119930
Aliaksandr Hrytskevich, Leszek Zaraska
This study demonstrates, for the first time, the feasibility of using bipolar anodization to fabricate tin oxide (SnOx) layers with controlled gradients in thickness and morphology. Sn foils were placed in 0.1 M NaOH between two Pt feeder electrodes, across which a potential difference of 20 V was applied for 30 min. SEM analysis revealed an exponential decrease in oxide layer thickness and a linear decrease in channel diameter with increasing distance from the sample edge, accompanied by a transition from cracked to crack-free regions. At the farthest zone, anodic dissolution of Sn occurred instead of oxide formation. These findings highlight bipolar anodization as a versatile approach for producing gradient SnOx coatings, offering new opportunities for advanced applications in photoelectrochemical energy conversion, gas sensing, and catalysis.
本研究首次证明了利用双极阳极氧化法制备厚度和形貌梯度可控的氧化锡（SnOx）层的可行性。锡箔被放置在0.1 M NaOH中，在两个Pt馈线电极之间，在其上施加20 V的电位差30分钟。扫描电镜分析显示，随着距离试样边缘的增加，氧化层厚度呈指数下降，通道直径呈线性下降，并伴有从裂纹区到无裂纹区的转变。在最远的区域，锡发生阳极溶解，而不是形成氧化物。这些发现强调了双极阳极氧化是一种生产梯度SnOx涂层的通用方法，为光电化学能量转换、气体传感和催化等领域的先进应用提供了新的机会。
{"title":"Formation of gradient SnOx films by wireless anodization","authors":"Aliaksandr Hrytskevich, Leszek Zaraska","doi":"10.1016/j.jelechem.2026.119930","DOIUrl":"10.1016/j.jelechem.2026.119930","url":null,"abstract":"<div><div>This study demonstrates, for the first time, the feasibility of using bipolar anodization to fabricate tin oxide (SnO<sub>x</sub>) layers with controlled gradients in thickness and morphology. Sn foils were placed in 0.1 M NaOH between two Pt feeder electrodes, across which a potential difference of 20 V was applied for 30 min. SEM analysis revealed an exponential decrease in oxide layer thickness and a linear decrease in channel diameter with increasing distance from the sample edge, accompanied by a transition from cracked to crack-free regions. At the farthest zone, anodic dissolution of Sn occurred instead of oxide formation. These findings highlight bipolar anodization as a versatile approach for producing gradient SnO<sub>x</sub> coatings, offering new opportunities for advanced applications in photoelectrochemical energy conversion, gas sensing, and catalysis.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1007 ","pages":"Article 119930"},"PeriodicalIF":4.1,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171849","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 : 2026-04-15Epub Date: 2026-02-08DOI: 10.1016/j.jelechem.2026.119922
Mansor Hussain , Abdur Rehman Nasrullah , Muhammad Hasnain , Amna Abrar , Sundus Umer , Muhammad Hanzla , Hafiz Tanveer Ahmed , Khadija Tabassum
Single-Atom Catalysts (SACs) for Urea oxidation reaction (UOR) provide a promising platform for sustainable energy production and environmental remediation. By offering atomic-level precision, SACs maximize catalytic activity, selectivity, and stability, enabling UOR to occur at lower overpotentials compared to traditional catalysts. This review presents an in-depth analysis of SACs for UOR, emphasizing rational design, synthesis strategies, mechanistic insights, and advanced characterization. We discuss various synthesis methods, the pivotal role of support materials, and the application of in situ/operando techniques and artificial intelligence in catalyst discovery. The ultimate goal is to provide a comprehensive resource for developing efficient, stable, and scalable SACs for real-world deployment in hydrogen production and wastewater treatment.
{"title":"Single-Atom Catalysts for Urea Electrooxidation: Rational Design, Synthesis Strategies, and Mechanistic Insights","authors":"Mansor Hussain , Abdur Rehman Nasrullah , Muhammad Hasnain , Amna Abrar , Sundus Umer , Muhammad Hanzla , Hafiz Tanveer Ahmed , Khadija Tabassum","doi":"10.1016/j.jelechem.2026.119922","DOIUrl":"10.1016/j.jelechem.2026.119922","url":null,"abstract":"<div><div>Single-Atom Catalysts (SACs) for Urea oxidation reaction (UOR) provide a promising platform for sustainable energy production and environmental remediation. By offering atomic-level precision, SACs maximize catalytic activity, selectivity, and stability, enabling UOR to occur at lower overpotentials compared to traditional catalysts. This review presents an in-depth analysis of SACs for UOR, emphasizing rational design, synthesis strategies, mechanistic insights, and advanced characterization. We discuss various synthesis methods, the pivotal role of support materials, and the application of in situ/operando techniques and artificial intelligence in catalyst discovery. The ultimate goal is to provide a comprehensive resource for developing efficient, stable, and scalable SACs for real-world deployment in hydrogen production and wastewater treatment.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1007 ","pages":"Article 119922"},"PeriodicalIF":4.1,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172196","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}
The commercialization of silicon monoxide (SiOₓ) anodes has been hindered by their poor cycling stability resulting from significant volume expansion during cycling. Composite doping represents a common strategy to address this issue. In this study, a ternary core–shell architecture was constructed via a one-step approach, and for the first time, the feasibility of co-incorporating both anatase and rutile TiO₂ phases into a SiOₓ/C core–shell framework was demonstrated. Furthermore, the distinct mechanisms by which each crystal phase enhances the electrochemical performance of the composite were systematically elucidated: the anatase phase primarily establishes a stable Li+ conduction network, thereby improving long-term cycling stability, while the rutile phase significantly enhances Li+ diffusion kinetics through its unique crystalline channels, leading to superior rate capability. The TiO₂–SiOₓ/C composite prepared with anatase TiO₂ exhibited an initial discharge capacity of 1830.32 mAh g−1 and retained 997.10 mAh g−1 after 300 cycles, corresponding to a capacity retention of 53.96%. In contrast, the composite incorporating rutile TiO₂ delivered specific capacities of 1066.11, 991.92, 890.98, and 679.23 mAh g−1 at current densities of 0.3, 0.5, 1.0, and 3.0 A g−1, respectively.
一氧化硅（SiOₓ）阳极在循环过程中由于体积膨胀导致循环稳定性差，阻碍了其商业化。复合兴奋剂是解决这一问题的常用策略。在本研究中，通过一步法构建了三元核壳结构，并首次证明了将锐钛矿和金红石tio2相共同纳入SiOₓ/C核壳框架的可行性。此外，系统地阐明了每种晶体相增强复合材料电化学性能的不同机制：锐钛矿相主要建立稳定的Li+传导网络，从而提高长期循环稳定性，而金红石相通过其独特的晶体通道显著增强Li+扩散动力学，从而具有优越的速率能力。以钛矿tio2为原料制备的tio2 -SiOₓ/C复合材料的初始放电容量为1830.32 mAh g−1，循环300次后容量保持率为997.10 mAh g−1，容量保持率为53.96%。相比之下，含金红石tio2的复合材料在电流密度为0.3、0.5、1.0和3.0 A g−1时的比容量分别为1066.11、991.92、890.98和679.23 mAh g−1。
{"title":"A ternary TiO2/SiOx/C composite with different crystalline phases of TiO2 as an anode material for high performance lithium-ion batteries","authors":"Xiangwu Zhao, Minglu Liu, Hao He, Fangfang Wang, Shengwen Zhong","doi":"10.1016/j.jelechem.2026.119831","DOIUrl":"10.1016/j.jelechem.2026.119831","url":null,"abstract":"<div><div>The commercialization of silicon monoxide (SiOₓ) anodes has been hindered by their poor cycling stability resulting from significant volume expansion during cycling. Composite doping represents a common strategy to address this issue. In this study, a ternary core–shell architecture was constructed via a one-step approach, and for the first time, the feasibility of co-incorporating both anatase and rutile TiO₂ phases into a SiOₓ/C core–shell framework was demonstrated. Furthermore, the distinct mechanisms by which each crystal phase enhances the electrochemical performance of the composite were systematically elucidated: the anatase phase primarily establishes a stable Li<sup>+</sup> conduction network, thereby improving long-term cycling stability, while the rutile phase significantly enhances Li<sup>+</sup> diffusion kinetics through its unique crystalline channels, leading to superior rate capability. The TiO₂–SiOₓ/C composite prepared with anatase TiO₂ exhibited an initial discharge capacity of 1830.32 mAh g<sup>−1</sup> and retained 997.10 mAh g<sup>−1</sup> after 300 cycles, corresponding to a capacity retention of 53.96%. In contrast, the composite incorporating rutile TiO₂ delivered specific capacities of 1066.11, 991.92, 890.98, and 679.23 mAh g<sup>−1</sup> at current densities of 0.3, 0.5, 1.0, and 3.0 A g<sup>−1</sup>, respectively.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119831"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146048998","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 : 2026-04-01Epub Date: 2026-01-24DOI: 10.1016/j.jelechem.2026.119847
Andreia D. Veloso, Maria C. Oliveira
The electrochemical synthesis of carbon dots (CDs) in aqueous media has gained considerable prominence in the development of quasi-zero-dimensional nanomaterials, due to its alignment with green chemistry principles and its ability to offer precise control over synthesis conditions.
This work presents a critical and comprehensive analysis of strategies for the electrochemical synthesis of CDs. Emphasis is placed on the effect of electrode polarization mode, whether potentiostatic, galvanostatic, or potentiodynamic. Within each mode, the review systematically examines key experimental parameters, including electrolyte composition, carbon source, applied potential or current, synthesis duration, and cell configuration, and analyses how each influences the physicochemical properties of the resulting nanomaterials
The long-standing dichotomy between top-down and bottom-up strategies is revisited in the context of systems where organic electrolytes and carbon-based electrodes can simultaneously act as carbon sources. The emergence of hybrid synthesis strategies provides unprecedented control over the core structure and surface chemistry of CDs, enhancing their optical and catalytic tunability.
By analyzing literature from 2008 to 2025, this review highlights key developments, identifies persistent challenges, and outlines future research directions, thereby contributing to the rational design of the electrochemical synthesis strategies for carbon dots.
{"title":"Electrochemical synthesis of carbon dots in aqueous media: a critical review","authors":"Andreia D. Veloso, Maria C. Oliveira","doi":"10.1016/j.jelechem.2026.119847","DOIUrl":"10.1016/j.jelechem.2026.119847","url":null,"abstract":"<div><div>The electrochemical synthesis of carbon dots (CDs) in aqueous media has gained considerable prominence in the development of quasi-zero-dimensional nanomaterials, due to its alignment with green chemistry principles and its ability to offer precise control over synthesis conditions.</div><div>This work presents a critical and comprehensive analysis of strategies for the electrochemical synthesis of CDs. Emphasis is placed on the effect of electrode polarization mode, whether potentiostatic, galvanostatic, or potentiodynamic. Within each mode, the review systematically examines key experimental parameters, including electrolyte composition, carbon source, applied potential or current, synthesis duration, and cell configuration, and analyses how each influences the physicochemical properties of the resulting nanomaterials</div><div>The long-standing dichotomy between top-down and bottom-up strategies is revisited in the context of systems where organic electrolytes and carbon-based electrodes can simultaneously act as carbon sources. The emergence of hybrid synthesis strategies provides unprecedented control over the core structure and surface chemistry of CDs, enhancing their optical and catalytic tunability.</div><div>By analyzing literature from 2008 to 2025, this review highlights key developments, identifies persistent challenges, and outlines future research directions, thereby contributing to the rational design of the electrochemical synthesis strategies for carbon dots.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119847"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185970","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 : 2026-04-01Epub Date: 2025-11-26DOI: 10.1016/j.jelechem.2025.119693
Xiaoran Li , Liying Wang , Jinzheng Liu , Yabin Wang , Minghui Zhang , Yu Yan , Tieshi He
Polyimide (PI)/Zeolitic imidazolate framework-8 (ZIF-8) composite nanofibers were successfully fabricated via electrospinning process. The influence of varying ZIF-8 contents on the morphology and property of PI/ZIF-8 electrospun fibers were investigated by scanning electron microscope, Fourier transform infrared and X-ray powder diffractometer. ZIF-8 nanoparticles can be uniformly distributed within PI electrospun fibers matrix under optimized electrospinning conditions. The electrolyte wettability, uptake capacity and electrochemical stability of PI/ZIF-8 electrospun fibers were systematically examined. PI/ZIF-8 electrospun fiber separator can provide good affinity and wide electrochemical stability window. The relationship between electrochemical performance and structure of PI/ZIF-8 electrospun fibers served as separator for aqueous zinc ion batteries was studied by alternating current impedance, cyclic voltammetry and constant current charge-discharge tests. The incorporation of ZIF-8 significantly enhanced the electrochemical performance of electrospun fiber separator. PI/ZIF-8 electrospun fiber separator derived from PI: ZIF-8 mass ratio = 100: 15 shows excellent comprehensive electrochemical performance: high energy density (4.01 Wh kg−1) at high power density (18.27 W kg−1), the capacity retention rate is 68.8 % after 1000 charge-discharge at 2C. Therefore, the present study provides a promising strategy for developing PI based nanofibers served as separator of electrochemical energy storage devices.
采用静电纺丝法制备了聚酰亚胺(PI)/沸石咪唑酯骨架-8 （ZIF-8）复合纳米纤维。采用扫描电镜、傅里叶变换红外光谱和x射线粉末衍射仪研究了不同ZIF-8含量对PI/ZIF-8静电纺纤维形态和性能的影响。在优化的静电纺丝条件下，ZIF-8纳米颗粒可以均匀分布在PI静电纺丝纤维基体中。系统地考察了PI/ZIF-8静电纺纤维的电解质润湿性、吸收能力和电化学稳定性。PI/ZIF-8型静电纺纤维分离器具有良好的亲和性和较宽的电化学稳定窗口。采用交流阻抗法、循环伏安法和恒流充放电试验研究了PI/ZIF-8静电纺纤维作为锌离子电池隔膜的电化学性能与结构的关系。ZIF-8的加入显著提高了静电纺纤维分离器的电化学性能。由PI: ZIF-8质量比= 100:15衍生出的PI/ZIF-8静电纺纤维分离器具有优异的综合电化学性能：在高功率密度（18.27 W kg - 1）下能量密度（4.01 Wh kg - 1）高，在2C条件下1000次充放电后容量保持率为68.8%。因此，本研究为开发PI基纳米纤维作为电化学储能装置的分离器提供了一条有前途的策略。
{"title":"Uniform ZIF-8 dispersion in polyimide nanofibers enabling dual-ion sieving and dendrite suppression for high-energy-density zinc-ion batteries","authors":"Xiaoran Li , Liying Wang , Jinzheng Liu , Yabin Wang , Minghui Zhang , Yu Yan , Tieshi He","doi":"10.1016/j.jelechem.2025.119693","DOIUrl":"10.1016/j.jelechem.2025.119693","url":null,"abstract":"<div><div>Polyimide (PI)/Zeolitic imidazolate framework-8 (ZIF-8) composite nanofibers were successfully fabricated <em>via</em> electrospinning process. The influence of varying ZIF-8 contents on the morphology and property of PI/ZIF-8 electrospun fibers were investigated by scanning electron microscope, Fourier transform infrared and X-ray powder diffractometer. ZIF-8 nanoparticles can be uniformly distributed within PI electrospun fibers matrix under optimized electrospinning conditions. The electrolyte wettability, uptake capacity and electrochemical stability of PI/ZIF-8 electrospun fibers were systematically examined. PI/ZIF-8 electrospun fiber separator can provide good affinity and wide electrochemical stability window. The relationship between electrochemical performance and structure of PI/ZIF-8 electrospun fibers served as separator for aqueous zinc ion batteries was studied by alternating current impedance, cyclic voltammetry and constant current charge-discharge tests. The incorporation of ZIF-8 significantly enhanced the electrochemical performance of electrospun fiber separator. PI/ZIF-8 electrospun fiber separator derived from PI: ZIF-8 mass ratio = 100: 15 shows excellent comprehensive electrochemical performance: high energy density (4.01 Wh kg<sup>−1</sup>) at high power density (18.27 W kg<sup>−1</sup>), the capacity retention rate is 68.8 % after 1000 charge-discharge at 2C. Therefore, the present study provides a promising strategy for developing PI based nanofibers served as separator of electrochemical energy storage devices.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119693"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076389","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 : 2026-04-01Epub Date: 2026-01-26DOI: 10.1016/j.jelechem.2026.119876
Roni Adi Wijaya , Gunawan Gunawan , Ahmad Suseno , Nor Basid Adiwibawa Prasetya , Fitria 'Izzatun Nisa , Wilman Septina , Takashi Harada
The increasing release of persistent organic dyes, such as methylene blue (MB), from industrial effluents poses a serious environmental concern due to their high toxicity and resistance to conventional treatment methods. This study investigates the optimization of dip-coated BiVO₄ thin films and their modification with CdS to construct a BiVO4/CdS Z-scheme heterojunction for enhanced visible-light-driven photodegradation of MB. BiVO4 films were synthesized on FTO substrates via dip-coating with varied deposition durations and subsequently coated with CdS nanoparticles. Structural and morphological analyses confirmed the formation of crystalline monoclinic BiVO4 with uniform CdS coverage and strong interfacial coupling. The optimized BiVO4(20 min)/CdS thin film achieved a 94.7% MB degradation within 120 min under visible-light illumination, following pseudo-first-order kinetics with a rate constant of 0.0249 min−1. Photoelectrochemical characterization revealed a significant increase in photocurrent from 0.2 mA·cm−2 for bare BiVO4 to 1.3 mA·cm−2 for BiVO4/CdS, confirming improved charge separation and interfacial charge-transfer efficiency. The Z-scheme mechanism enables photogenerated electrons in the CdS conduction band to recombine with holes in the BiVO4 valence band, thereby preserving strong redox potentials for the formation of reactive oxygen species (ROS). These ROS drive oxidative pathways, including N-demethylation, hydroxylation, and aromatic ring cleavage, leading to complete MB mineralization. The BiVO4/CdS thin film also exhibits excellent stability and reusability over four successive cycles with minimal efficiency loss. This work demonstrates a facile strategy for designing high-performance photoanodes for solar-driven wastewater treatment and sustainable environmental remediation.
{"title":"Tailoring BiVO₄/CdS dip-coated Z-scheme heterojunction thin films for enhanced visible-light-driven photodegradation of methylene blue: deposition optimization, kinetics, and mechanistic insights","authors":"Roni Adi Wijaya , Gunawan Gunawan , Ahmad Suseno , Nor Basid Adiwibawa Prasetya , Fitria 'Izzatun Nisa , Wilman Septina , Takashi Harada","doi":"10.1016/j.jelechem.2026.119876","DOIUrl":"10.1016/j.jelechem.2026.119876","url":null,"abstract":"<div><div>The increasing release of persistent organic dyes, such as methylene blue (MB), from industrial effluents poses a serious environmental concern due to their high toxicity and resistance to conventional treatment methods. This study investigates the optimization of dip-coated BiVO₄ thin films and their modification with CdS to construct a BiVO<sub>4</sub>/CdS <em>Z</em>-scheme heterojunction for enhanced visible-light-driven photodegradation of MB. BiVO<sub>4</sub> films were synthesized on FTO substrates via dip-coating with varied deposition durations and subsequently coated with CdS nanoparticles. Structural and morphological analyses confirmed the formation of crystalline monoclinic BiVO<sub>4</sub> with uniform CdS coverage and strong interfacial coupling. The optimized BiVO<sub>4</sub>(20 min)/CdS thin film achieved a 94.7% MB degradation within 120 min under visible-light illumination, following pseudo-first-order kinetics with a rate constant of 0.0249 min<sup>−1</sup>. Photoelectrochemical characterization revealed a significant increase in photocurrent from 0.2 mA·cm<sup>−2</sup> for bare BiVO<sub>4</sub> to 1.3 mA·cm<sup>−2</sup> for BiVO<sub>4</sub>/CdS, confirming improved charge separation and interfacial charge-transfer efficiency. The <em>Z</em>-scheme mechanism enables photogenerated electrons in the CdS conduction band to recombine with holes in the BiVO<sub>4</sub> valence band, thereby preserving strong redox potentials for the formation of reactive oxygen species (ROS). These ROS drive oxidative pathways, including <em>N</em>-demethylation, hydroxylation, and aromatic ring cleavage, leading to complete MB mineralization. The BiVO<sub>4</sub>/CdS thin film also exhibits excellent stability and reusability over four successive cycles with minimal efficiency loss. This work demonstrates a facile strategy for designing high-performance photoanodes for solar-driven wastewater treatment and sustainable environmental remediation.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119876"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146076387","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 : 2026-04-01Epub Date: 2026-01-30DOI: 10.1016/j.jelechem.2026.119897
Qing Yang , Jingsen Zhang , Mingyi Lv , Chuanjie Chen , Yue Hua , Hong Li , Lanbo Di
Regulating the cobalt valence state is a crucial strategy for enhancing nonenzymatic glucose detection. In this study, two self-supported Co3O4 nanocomposites were fabricated on plasma-pretreated carbon cloth (CCP) by electrodepositing an α-Co(OH)2 precursor followed by either plasma treatment yielding Co3O4/CCP-P or calcination yielding Co3O4/CCP-C. Structural characterization reveals that plasma pretreatment enriches the CCP surface with abundant oxygen-containing functional groups (OCGs), significantly improving its hydrophilicity. In addition, the Co3O4/CCP-C exhibits a phase-pure structure enriched with multiple Co3+ and surface-adsorbed oxygen (OAds). These properties coupled with its rapid electron-transfer capability significantly promote the glucose oxidation reaction. Compared with Co3O4/CCP-P, the Co3O4/CCP-C electrode presents markedly higher electrocatalytic activity toward glucose oxidation, featuring superior sensitivities of 6380 μA·mM−1·cm−2 (0.05–0.4 mM) and 2070 μA·mM−1·cm−2 (0.4–1.4 mM), along with a lower limit of detection (2.9 μM). The Co3O4/CCP-C electrode also exhibits excellent selectivity, good preparation repeatability (relative standard deviation (RSD) = 2.14%), operational repeatability (RSD = 1.36%) and favorable stability (RSD = 2.40%). This study provides a promising approach for developing efficient non-enzymatic glucose oxidation Co-based electrocatalysts, and gets insights into the influence mechanism by engineering the Co valence state.
{"title":"Engineering valence state of Co3O4 on carbon cloth for efficient nonenzymatic glucose detection","authors":"Qing Yang , Jingsen Zhang , Mingyi Lv , Chuanjie Chen , Yue Hua , Hong Li , Lanbo Di","doi":"10.1016/j.jelechem.2026.119897","DOIUrl":"10.1016/j.jelechem.2026.119897","url":null,"abstract":"<div><div>Regulating the cobalt valence state is a crucial strategy for enhancing nonenzymatic glucose detection. In this study, two self-supported Co<sub>3</sub>O<sub>4</sub> nanocomposites were fabricated on plasma-pretreated carbon cloth (CC<sup>P</sup>) by electrodepositing an α-Co(OH)<sub>2</sub> precursor followed by either plasma treatment yielding Co<sub>3</sub>O<sub>4</sub>/CC<sup>P</sup>-P or calcination yielding Co<sub>3</sub>O<sub>4</sub>/CC<sup>P</sup>-C. Structural characterization reveals that plasma pretreatment enriches the CC<sup>P</sup> surface with abundant oxygen-containing functional groups (OCGs), significantly improving its hydrophilicity. In addition, the Co<sub>3</sub>O<sub>4</sub>/CC<sup>P</sup>-C exhibits a phase-pure structure enriched with multiple Co<sup>3+</sup> and surface-adsorbed oxygen (O<sub>Ads</sub>). These properties coupled with its rapid electron-transfer capability significantly promote the glucose oxidation reaction. Compared with Co<sub>3</sub>O<sub>4</sub>/CC<sup>P</sup>-P, the Co<sub>3</sub>O<sub>4</sub>/CC<sup>P</sup>-C electrode presents markedly higher electrocatalytic activity toward glucose oxidation, featuring superior sensitivities of 6380 μA·mM<sup>−1</sup>·cm<sup>−2</sup> (0.05–0.4 mM) and 2070 μA·mM<sup>−1</sup>·cm<sup>−2</sup> (0.4–1.4 mM), along with a lower limit of detection (2.9 μM). The Co<sub>3</sub>O<sub>4</sub>/CC<sup>P</sup>-C electrode also exhibits excellent selectivity, good preparation repeatability (relative standard deviation (RSD) = 2.14%), operational repeatability (RSD = 1.36%) and favorable stability (RSD = 2.40%). This study provides a promising approach for developing efficient non-enzymatic glucose oxidation Co-based electrocatalysts, and gets insights into the influence mechanism by engineering the Co valence state.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119897"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185380","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 : 2026-04-01Epub Date: 2026-01-28DOI: 10.1016/j.jelechem.2026.119886
Xiutao Tang, Zengwei Zhu
Electrochemical machining is a beneficial technique for near-α Ti alloys because it induces no processing stress and provides high material removal efficiency. TA12A is a recently developed titanium alloy belonging to the same category of near-α titanium alloys as TA15. This study investigates the anodic dissolution behavior of TA12A and TA15 in a NaCl solution and analyzes the underlying phenomena. Comparative assessments of polarization curves and material removal rates show that both alloys exhibit similar polarization characteristics, although TA12A exhibits a higher transpassivation potential and a greater material removal rate at high current densities. The dissolution behavior was examined under different current densities and dissolution times. Owing to the presence of Mo, Zr, and other corrosion-resistant elements, the β phase in both alloys shows higher corrosion resistance than the α phase, resulting in preferential dissolution of the α phase. The β phase of TA12A additionally contains corrosion-resistant elements such as Nb, Sn, and Ta, giving it superior resistance compared with the β phase of TA15. In TA12A, there is a larger contrast in corrosion resistance between the α and β phases, which results in a more pronounced difference in phase height after dissolution. Consequently, TA12A exhibits inferior surface quality compared with TA15 under identical conditions. Dissolution models were developed to elucidate the electrochemical dissolution characteristics of TA12A and TA15 in the NaCl solution.
{"title":"Electrochemical dissolution behavior of two near-α titanium alloys TA12A and TA15 in NaCl solution","authors":"Xiutao Tang, Zengwei Zhu","doi":"10.1016/j.jelechem.2026.119886","DOIUrl":"10.1016/j.jelechem.2026.119886","url":null,"abstract":"<div><div>Electrochemical machining is a beneficial technique for near-α Ti alloys because it induces no processing stress and provides high material removal efficiency. TA12A is a recently developed titanium alloy belonging to the same category of near-α titanium alloys as TA15. This study investigates the anodic dissolution behavior of TA12A and TA15 in a NaCl solution and analyzes the underlying phenomena. Comparative assessments of polarization curves and material removal rates show that both alloys exhibit similar polarization characteristics, although TA12A exhibits a higher transpassivation potential and a greater material removal rate at high current densities. The dissolution behavior was examined under different current densities and dissolution times. Owing to the presence of Mo, Zr, and other corrosion-resistant elements, the β phase in both alloys shows higher corrosion resistance than the α phase, resulting in preferential dissolution of the α phase. The β phase of TA12A additionally contains corrosion-resistant elements such as Nb, Sn, and Ta, giving it superior resistance compared with the β phase of TA15. In TA12A, there is a larger contrast in corrosion resistance between the α and β phases, which results in a more pronounced difference in phase height after dissolution. Consequently, TA12A exhibits inferior surface quality compared with TA15 under identical conditions. Dissolution models were developed to elucidate the electrochemical dissolution characteristics of TA12A and TA15 in the NaCl solution.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119886"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185969","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 : 2026-04-01Epub Date: 2026-01-31DOI: 10.1016/j.jelechem.2026.119898
Jiaxuan Hu , Jinhao Zheng , Yuanjing Li , Yang Shao , Xiangguang Bi , Zhengfu Zhang , Shaohua Ju , Xian Zhou
In response to the urgent need for high-performance lithium-ion batteries in the global energy transition, this paper focuses on two mainstream cathode materials: high-energy-density nickel-rich ternary materials ((LiNi1-x-yCoxMnyO₂, LiNi1-x-yCoxAlyO₂)) and high-safety lithium iron phosphate (LiFePO₄). The research progress on element doping strategies for regulating the intrinsic properties and improving the electrochemical performance of these materials is systematically reviewed. The article first analyzes the key challenges faced by the two materials: nickel-rich materials are prone to structural degradation and interfacial side reactions, while lithium iron phosphate is limited by its low ionic and electronic conductivity. On this basis, the mechanisms of cation doping, anion doping, and multi-element co-doping strategies in stabilizing the crystal framework, inhibiting phase transition, broadening lithium-ion migration channels, and strengthening interface stability are emphatically expounded. By systematically summarizing the optimization effects of different doping elements on material capacity, rate performance, and cycle stability, this paper further looks forward to future development directions, including the single-crystal design of nickel-rich materials, low-cobalt/cobalt-free design, the construction of an efficient conductive network for lithium iron phosphate, and the new role of doping technology in promoting its adaptation to solid-state battery systems. The aim is to provide a theoretical reference and technical pathway for the rational design of next-generation high-performance and high-stability lithium-ion battery cathode materials.
{"title":"Research progress on doping modification of lithium-ion cathode materials: high-nickel LiNi1−x−yCoxMnyO₂, LiNi1−x−y CoxAlyO₂ and LiFePO₄","authors":"Jiaxuan Hu , Jinhao Zheng , Yuanjing Li , Yang Shao , Xiangguang Bi , Zhengfu Zhang , Shaohua Ju , Xian Zhou","doi":"10.1016/j.jelechem.2026.119898","DOIUrl":"10.1016/j.jelechem.2026.119898","url":null,"abstract":"<div><div>In response to the urgent need for high-performance lithium-ion batteries in the global energy transition, this paper focuses on two mainstream cathode materials: high-energy-density nickel-rich ternary materials ((LiNi<sub>1-x-y</sub>Co<sub>x</sub>Mn<sub>y</sub>O₂, LiNi<sub>1-x-y</sub>Co<sub>x</sub>Al<sub>y</sub>O₂)) and high-safety lithium iron phosphate (LiFePO₄). The research progress on element doping strategies for regulating the intrinsic properties and improving the electrochemical performance of these materials is systematically reviewed. The article first analyzes the key challenges faced by the two materials: nickel-rich materials are prone to structural degradation and interfacial side reactions, while lithium iron phosphate is limited by its low ionic and electronic conductivity. On this basis, the mechanisms of cation doping, anion doping, and multi-element co-doping strategies in stabilizing the crystal framework, inhibiting phase transition, broadening lithium-ion migration channels, and strengthening interface stability are emphatically expounded. By systematically summarizing the optimization effects of different doping elements on material capacity, rate performance, and cycle stability, this paper further looks forward to future development directions, including the single-crystal design of nickel-rich materials, low-cobalt/cobalt-free design, the construction of an efficient conductive network for lithium iron phosphate, and the new role of doping technology in promoting its adaptation to solid-state battery systems. The aim is to provide a theoretical reference and technical pathway for the rational design of next-generation high-performance and high-stability lithium-ion battery cathode materials.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119898"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185382","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 : 2026-04-01Epub Date: 2026-01-31DOI: 10.1016/j.jelechem.2026.119889
Huirou Zhou , Shasha He , Xinglin Qin , Rahim Rahimi , Pengzhan Liu , Hongjie Jiang
Capsaicin is the primary bioactive compound responsible for the pungent sensation in spicy foods, and its content directly determines the intensity of spiciness. However, current evaluations of spiciness largely rely on subjective sensory assessments, lacking objective and quantitative methods. Therefore, the development of a rapid-response sensor capable of accurately detecting capsaicin is of great significance. In this study, a composite material based on sulfonated reduced graphene oxide (SRGO) and carboxylated multi-walled carbon nanotubes (CNT-COOH), dispersed with β-cyclodextrin (β-CD), was successfully fabricated and employed to modify a carbon cloth (CC) electrode, resulting in a flexible electrochemical sensor for capsaicin detection. In detail, SRGO could provide high electrical conductivity, and CNT-COOH offer a large specific surface area and abundant active sites. Benefiting from these advantages, this electrode exhibits outstanding electrocatalytic performance toward capsaicin in buffer solution, including a wide linear range (1–340 μM), a low detection limit (1.67 μM), high response current (at the milliampere level), excellent selectivity and strong anti-interference capability. Overall, this work provides a robust electrochemical platform for capsaicin quantification. This sensing strategy also provides a valuable basis for the future development of portable and low-cost capsaicin detection devices, offering substantial potential for rapid, on-site, and objective assessment of spiciness in practical applications.
{"title":"A highly sensitive electrochemical sensor for capsaicin detection based on carbon-cloth electrodes modified with SRGO/CNT-COOH/β-CD","authors":"Huirou Zhou , Shasha He , Xinglin Qin , Rahim Rahimi , Pengzhan Liu , Hongjie Jiang","doi":"10.1016/j.jelechem.2026.119889","DOIUrl":"10.1016/j.jelechem.2026.119889","url":null,"abstract":"<div><div>Capsaicin is the primary bioactive compound responsible for the pungent sensation in spicy foods, and its content directly determines the intensity of spiciness. However, current evaluations of spiciness largely rely on subjective sensory assessments, lacking objective and quantitative methods. Therefore, the development of a rapid-response sensor capable of accurately detecting capsaicin is of great significance. In this study, a composite material based on sulfonated reduced graphene oxide (SRGO) and carboxylated multi-walled carbon nanotubes (CNT-COOH), dispersed with β-cyclodextrin (β-CD), was successfully fabricated and employed to modify a carbon cloth (CC) electrode, resulting in a flexible electrochemical sensor for capsaicin detection. In detail, SRGO could provide high electrical conductivity, and CNT-COOH offer a large specific surface area and abundant active sites. Benefiting from these advantages, this electrode exhibits outstanding electrocatalytic performance toward capsaicin in buffer solution, including a wide linear range (1–340 μM), a low detection limit (1.67 μM), high response current (at the milliampere level), excellent selectivity and strong anti-interference capability. Overall, this work provides a robust electrochemical platform for capsaicin quantification. This sensing strategy also provides a valuable basis for the future development of portable and low-cost capsaicin detection devices, offering substantial potential for rapid, on-site, and objective assessment of spiciness in practical applications.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1006 ","pages":"Article 119889"},"PeriodicalIF":4.1,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185383","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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