Journal of Electroanalytical Chemistry最新文献_第2页

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 定制BiVO₄/CdS浸涂z型异质结薄膜，增强可见光驱动的亚甲基蓝光降解：沉积优化，动力学和机理见解

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-26 DOI: 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.

工业废水中持久性有机染料（如亚甲基蓝）的释放越来越多，由于它们的高毒性和对传统处理方法的抗性，造成了严重的环境问题。本研究研究了浸涂BiVO4薄膜的优化及其CdS修饰，以构建BiVO4/CdS Z-scheme异质结，以增强可见光驱动光降解MB。通过不同沉积时间的浸涂在FTO衬底上合成BiVO4薄膜，随后涂覆CdS纳米颗粒。结构和形态分析证实了单斜晶BiVO4的形成，具有均匀的CdS覆盖和强的界面耦合。优化后的BiVO4(20 min)/CdS薄膜在可见光照射下，在120 min内实现了94.7%的MB降解，符合准一级动力学，速率常数为0.0249 min−1。光电化学表征表明，光电流从裸BiVO4的0.2 mA·cm−2显著增加到BiVO4/CdS的1.3 mA·cm−2，证实了电荷分离和界面电荷转移效率的提高。Z-scheme机制使CdS导带中的光生电子与BiVO4价带中的空穴重新结合，从而为形成活性氧（ROS）保留了强氧化还原电位。这些ROS驱动氧化途径，包括n -去甲基化、羟基化和芳香环裂解，从而导致MB的完全矿化。BiVO4/CdS薄膜在四个连续循环中表现出优异的稳定性和可重复使用性，效率损失最小。这项工作展示了设计高性能光阳极用于太阳能驱动的废水处理和可持续环境修复的简单策略。

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引用次数: 0

CO-tolerant Pt-based ternary spatial network catalyst for efficient methanol electro-oxidation 耐co的pt基三元空间网络高效甲醇电氧化催化剂

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-25 DOI: 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.

合理设计高耐一氧化碳性能的pt基电催化剂是推进直接甲醇燃料电池（dmfc）可持续发展的关键。为了解决这一挑战，构建了一种由Pt纳米晶体、镍掺杂碳酸盐氢氧钴（NiCoCH）和多孔碳组成的三元复合材料。所设计的pt基三元催化剂表现出优异的甲醇氧化反应（MOR）性能，这主要归功于Ni掺杂在氢氧化碳酸盐中对OH形成的水活化的动力学促进、三维空间网络结构和优化的协同催化。具体来说，它提供了1465.5 mA∙mg−1的显著MOR质量活性，是商业Pt/C （672.3 mA∙mg−1）的2.1倍。在3000 s时电流测试后，55%以上的初始活性保持不变。值得注意的是，三元催化剂上CO氧化的起始电位为0.15 V，明显低于Pt/C的0.33 V，表明CO耐受性大大增强。该研究为开发高性能MOR电催化剂提供了关键的设计原则。

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引用次数: 0

Hierarchically porous carbon derived from a sol-shaping strategy enabled by lignin-Fe3+ coordination for supercapacitors 分层多孔碳衍生自木质素- fe3 +配位的超级电容器的溶胶成型策略

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-25 DOI: 10.1016/j.jelechem.2026.119874

Xinxin Niu , Li Bai , Xiuling Xu , Yixian Xue , Zhao Chen , Fujun Wang

The potential of lignin as a sustainable precursor for carbon electrodes is currently hindered by its low reactivity, poor solubility, and the difficulty in synchronously optimizing pore structure and electrical conductivity. In this study, a Fe³⁺ coordination-assisted solvothermal self-assembly strategy was developed to fabricate hierarchical porous carbon from lignin. Through a comprehensive characterization using XPS, XRD, FTIR, and BET techniques, it was confirmed that Fe³⁺ effectively coordinates with the phenolic hydroxyl/carboxyl groups of lignin, leading to a synergistic effect of “metal-induced graphitization” and “self-templating” during the carbonization process. The resulting carbon material exhibited a high specific capacitance of 204 F g⁻¹ at 1 A/g and low charge transfer resistance. Notably, XPS analysis revealed the formation of FeO active sites and surface functional groups after acid washing, further enhancing the electrochemical performance of the material. Capacitance contribution analysis elucidated the charge storage mechanism， showing that the capacitive contribution reached 77.8% at 10 mV s⁻¹ and remained at 91.7% even at 100 mV s⁻¹. Kinetic analysis reveals a dominant surface-controlled pseudocapacitive contribution, which underpins the excellent rate capability with 83.45% retention even at 10 A g⁻¹. This work provides a promising approach for the development of high-performance lignin-based carbon materials. The elucidation of the “structure-energy storage mechanism” relationship offers valuable theoretical insights for the rational design of biomass-derived carbon materials with enhanced electrochemical properties.

目前，木质素作为碳电极的可持续前驱体的潜力受到其低反应性、低溶解度以及难以同步优化孔隙结构和电导率的阻碍。在本研究中，开发了Fe3+配位辅助溶剂热自组装策略，以木质素为原料制备分层多孔碳。通过XPS、XRD、FTIR、BET等技术的综合表征，证实了Fe3+与木质素的酚羟基/羧基有效配位，在炭化过程中产生了“金属诱导石墨化”和“自模板化”的协同效应。所得碳材料在1 a /g时具有204 F g−1的高比电容和低电荷转移电阻。值得注意的是，XPS分析显示，酸洗后形成了FeO活性位点和表面官能团，进一步增强了材料的电化学性能。电容贡献分析表明，在10 mV s−1条件下，电容贡献达到77.8%，在100 mV s−1条件下，电容贡献仍保持在91.7%。动力学分析表明，表面控制赝电容的贡献占主导地位，这支持了即使在10 a g−1下也能保持83.45%的优异速率能力。这项工作为开发高性能木质素基碳材料提供了一条有前途的途径。“结构-能量储存机制”关系的阐明，为合理设计具有增强电化学性能的生物质衍生碳材料提供了有价值的理论见解。

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引用次数: 0

Regulating SEI formation in high-capacity Si/C anodes via synergistic dual-salt electrolyte engineering 协同双盐电解质工程调控高容量Si/C阳极SEI形成

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-24 DOI: 10.1016/j.jelechem.2026.119849

Dan Zhao , Bing Bai , Peiao Lu, Kui-Qing Peng

Silicon–carbon (Si/C) composite anodes offer significant potential for high-energy lithium-ion batteries (LIBs), but suffer from interfacial degradation due to differential volume changes between silicon and carbon. This mismatch leads to unstable solid electrolyte interphase (SEI) in carbonate electrolytes, accelerating capacity fading. In this work, we propose a dual-salt electrolyte strategy that synergizes LiFSI and LiPF₆ in tetrahydrofuran to address bulk transport and interfacial stability. The competitive coordination between PF₆⁻ and FSI⁻ anions modulates the SEI composition, thereby enabling formation of inorganic-rich, mechanically resilient structure. Furthermore, the reduced electrolyte viscosity enhances electrode wettability, while the optimized Li⁺ solvation lowers the desolvation barrier. Consequently, micron-scale Si/C anodes using the dual-salt electrolyte exhibit substantially improved cycling performance, retaining 81.2% capacity after 1700 cycles at 1 A g⁻¹ with near-unity Coulombic efficiency. This work highlights the importance of a rational dual-salt electrolyte design in enhancing the performance of Si/C anode-based LIBs.

硅碳（Si/C）复合阳极为高能锂离子电池（LIBs）提供了巨大的潜力，但由于硅和碳之间的体积变化差异，导致界面退化。这种不匹配导致碳酸盐电解质中不稳定的固体电解质界面（SEI），加速容量衰减。在这项工作中，我们提出了一种双盐电解质策略，在四氢呋喃中协同LiFSI和LiPF6，以解决批量传输和界面稳定性问题。PF6 -和FSI -阴离子之间的竞争配位调节了SEI的组成，从而形成了富含无机的机械弹性结构。此外，电解质粘度的降低提高了电极的润湿性，而优化的Li+溶剂化降低了脱溶势垒。因此，使用双盐电解质的微米级Si/C阳极表现出显著改善的循环性能，在1 A g−1下循环1700次后仍保持81.2%的容量，库仑效率接近统一。这项工作强调了合理的双盐电解质设计对提高硅/碳阳极基锂离子电池性能的重要性。

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引用次数: 0

Electrochemical behaviour of NAD+/NADH at carbon macro-, micro-, and rotating-disk electrodes: Degradation kinetics by time-resolved voltammetry NAD+/NADH在碳宏观、微观和旋转圆盘电极上的电化学行为：时间分辨伏安法降解动力学

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-24 DOI: 10.1016/j.jelechem.2026.119848

Phonthakorn Monthathong , Tharinda Kasemphong , Pattarawadee Therdkatanyuphong , Jinnapat Wijitsak , Tanatorn Khotavivattana , Kamonwad Ngamchuea

The electrochemical behaviour of nicotinamide adenine dinucleotide (NAD⁺ and NADH) was evaluated at carbon electrodes under three mass transport regimes: stationary macrodisc (planar diffusion), stationary microdisk (hemispherical diffusion), and rotating-disk (forced convection). Comparison of these regimes reveals how the apparent NAD⁺/NADH voltammetric response is transport-dependent, reflecting competition between interfacial kinetics and follow-up chemistry. Compared to transient macrodisk voltammetry, steady-state microdisk voltammetry delivered superior analytical performance, with linear ranges of 0.02–1.00 mM (NAD⁺) and 0.007–1.00 mM (NADH); sensitivities of 0.49 ± 0.01 nA mM⁻¹ (NAD⁺) and 0.85 ± 0.01 nA mM⁻¹ (NADH), and limits of detection (3S_B/m) of 7 μM (NAD⁺) and 2 μM (NADH). Hydrodynamic voltammetry revealed sluggish NAD⁺ reduction (

k^{0}

= 4.35 × 10⁻⁹ ± 0.09 × 10⁻⁹ m s⁻¹) and much faster NADH oxidation (

k^{0}

= 1.68 × 10⁻² ± 0.04 × 10⁻² m s⁻¹). Time-resolved voltammetry enabled reagent-free kinetic monitoring of NADH degradation in acids, which showed apparent first-order behaviour with respect to both NADH and H⁺ (rate ∝ [NADH][H⁺]; overall second order), giving a pseudo-first-order half-life t_1/2 ≈ 14 min at 298 K and pH 3.5, with an activation energy of 82 kJ mol⁻¹. UV–vis spectroscopy corroborated the electrochemical rates and ¹H, ¹³C, COSY, HSQC, and HMBC NMR identified cyclic-NADH formed via non-oxidative ring formation as the principal product, while NAD⁺ remains chemically stable. These findings provide mechanistic insight into non-enzymatic NADH decomposition in mildly acidic environments relevant to pharmaceutical formulation, gut absorption, and redox biology.

在固定大圆盘（平面扩散）、固定微圆盘（半球形扩散）和旋转圆盘（强制对流）三种质量传递机制下，研究了烟酰胺腺嘌呤二核苷酸（NAD+和NADH）在碳电极上的电化学行为。这些机制的比较揭示了明显的NAD+/NADH伏安响应是如何依赖于转运的，反映了界面动力学和后续化学之间的竞争。与瞬态宏盘伏安法相比，稳态微盘伏安法在0.02 ~ 1.00 mM （NAD+）和0.007 ~ 1.00 mM （NADH）的线性范围内具有更好的分析性能；灵敏度分别为0.49±0.01 nA mM−1 （NAD+）和0.85±0.01 nA mM−1 (NADH)，检出限分别为7 μM （NAD+）和2 μM (NADH)，为3SB/m。流体动力学伏安法显示NAD+还原缓慢（k0 = 4.35 × 10−9±0.09 × 10−9 m s−1），NADH氧化更快（k0 = 1.68 × 10−2±0.04 × 10−2 m s−1）。时间分辨伏安法实现了NADH在酸中降解的无试剂动力学监测，NADH和H+均表现出明显的一级行为（速率∝[NADH][H+]；总体为二级），在298 K和pH 3.5下的准一级半衰期为t1/2≈14 min，活化能为82 kJ mol−1。紫外可见光谱证实了电化学速率，1H、13C、COSY、HSQC和HMBC NMR鉴定了非氧化环形成的环状nadh为主要产物，而NAD+保持化学稳定。这些发现为在与药物配方、肠道吸收和氧化还原生物学相关的温和酸性环境中非酶促NADH分解提供了机制见解。

{"title":"Electrochemical behaviour of NAD+/NADH at carbon macro-, micro-, and rotating-disk electrodes: Degradation kinetics by time-resolved voltammetry","authors":"Phonthakorn Monthathong , Tharinda Kasemphong , Pattarawadee Therdkatanyuphong , Jinnapat Wijitsak , Tanatorn Khotavivattana , Kamonwad Ngamchuea","doi":"10.1016/j.jelechem.2026.119848","DOIUrl":"10.1016/j.jelechem.2026.119848","url":null,"abstract":"<div><div>The electrochemical behaviour of nicotinamide adenine dinucleotide (NAD<sup>+</sup> and NADH) was evaluated at carbon electrodes under three mass transport regimes: stationary macrodisc (planar diffusion), stationary microdisk (hemispherical diffusion), and rotating-disk (forced convection). Comparison of these regimes reveals how the apparent NAD<sup>+</sup>/NADH voltammetric response is transport-dependent, reflecting competition between interfacial kinetics and follow-up chemistry. Compared to transient macrodisk voltammetry, steady-state microdisk voltammetry delivered superior analytical performance, with linear ranges of 0.02–1.00 mM (NAD<sup>+</sup>) and 0.007–1.00 mM (NADH); sensitivities of 0.49 ± 0.01 nA mM<sup>−1</sup> (NAD<sup>+</sup>) and 0.85 ± 0.01 nA mM<sup>−1</sup> (NADH), and limits of detection (3S<sub>B</sub>/m) of 7 μM (NAD<sup>+</sup>) and 2 μM (NADH). Hydrodynamic voltammetry revealed sluggish NAD<sup>+</sup> reduction (<span><math><msup><mi>k</mi><mn>0</mn></msup></math></span> = 4.35 × 10<sup>−9</sup> ± 0.09 × 10<sup>−9</sup> m s<sup>−1</sup>) and much faster NADH oxidation (<span><math><msup><mi>k</mi><mn>0</mn></msup></math></span> = 1.68 × 10<sup>−2</sup> ± 0.04 × 10<sup>−2</sup> m s<sup>−1</sup>). Time-resolved voltammetry enabled reagent-free kinetic monitoring of NADH degradation in acids, which showed apparent first-order behaviour with respect to both NADH and H<sup>+</sup> (rate ∝ [NADH][H<sup>+</sup>]; overall second order), giving a pseudo-first-order half-life <em>t</em><sub>1/2</sub> ≈ 14 min at 298 K and pH 3.5, with an activation energy of 82 kJ mol<sup>−1</sup>. UV–vis spectroscopy corroborated the electrochemical rates and <sup>1</sup>H, <sup>13</sup>C, COSY, HSQC, and HMBC NMR identified cyclic-NADH formed via non-oxidative ring formation as the principal product, while NAD<sup>+</sup> remains chemically stable. These findings provide mechanistic insight into non-enzymatic NADH decomposition in mildly acidic environments relevant to pharmaceutical formulation, gut absorption, and redox biology.</div></div>","PeriodicalId":355,"journal":{"name":"Journal of Electroanalytical Chemistry","volume":"1005 ","pages":"Article 119848"},"PeriodicalIF":4.1,"publicationDate":"2026-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075346","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}

引用次数: 0

Cobalt-based metal-organic framework derived 3D interconnected NiCo2S4 nanoparticles network architectures for high-performance supercapacitors 钴基金属有机框架衍生的高性能超级电容器三维互联NiCo2S4纳米颗粒网络结构

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-23 DOI: 10.1016/j.jelechem.2026.119843

Naifeng Zhang , Yanli Chen , Yanrong Zhang , Xinyu Lv , Dan Wang , Wenchang Wang , Jie Wang , Xiaojiao Du , Naotoshi Mitsuzaki , Zhidong Chen

The practical deployment of transition metal sulfides in supercapacitors is constrained by intrinsic limitations including nanoparticle agglomeration, low active-site utilization, and inadequate rate performance. To circumvent the intrinsic constraints of transition metal sulfide electrodes, employing metal-organic framework (MOF) as a sacrificial template to construct well-defined nanostructures represents a highly effective strategy. In this contribution, we successfully construct three-dimensional (3D) interconnected NiCo₂S₄ nanoparticles network with abundant active sites by simple co-precipitation, ion exchange and subsequent sulfidation processes. The influence of sulfurization temperature and sulfurization duration on the electrochemical performance was systematically investigated. The rational design prevents the aggregation of NiCo₂S₄ nanoparticles, enables the resulting 3D interconnected network structure has high specific surface area and a larger number of active sites and excellent structural stability to enhance the electrochemical performance. The as-fabricated NiCo₂S₄/NF-120(6) electrode exhibits an outstanding specific capacitance of 1232C g⁻¹ at 1 A g⁻¹, along with a satisfactory capacitance retention of 72.94% when tested at 5 A g⁻¹ after 5000 cycles. Furthermore, the asymmetric supercapacitor (ASC) device achieves a high energy density of 28.58 Wh kg⁻¹ at a power density of 800 W kg⁻¹, accompanied by a maximum power density of 8000 W kg⁻¹. Notably, the ASC device also demonstrates a favorable capacity retention of 94.45% after 10,000 cycles. These results collectively confirm the practical application potential of the 3D interconnected nanoparticle network in advanced energy storage systems.

过渡金属硫化物在超级电容器中的实际应用受到纳米颗粒团聚、活性位点利用率低和速率性能不足等内在限制的制约。为了规避过渡金属硫化物电极的固有限制，采用金属有机框架（MOF）作为牺牲模板来构建定义良好的纳米结构是一种非常有效的策略。在这篇论文中，我们通过简单的共沉淀、离子交换和随后的硫化过程，成功构建了具有丰富活性位点的三维（3D）互联NiCo2S4纳米颗粒网络。系统地研究了硫化温度和硫化时间对电化学性能的影响。合理的设计防止了NiCo₂S₄纳米颗粒的聚集，使所得到的三维互联网络结构具有较高的比表面积和较多的活性位点以及优异的结构稳定性，从而提高了电化学性能。制备的NiCo₂S₄/NF-120(6)电极在1 A g−1条件下的比电容为1232C g−1，在5 A g−1条件下经过5000次循环测试，电容保持率为72.94%。此外，非对称超级电容器（ASC）器件在800w kg - 1的功率密度下实现了28.58 Wh kg - 1的高能量密度，最大功率密度为8000w kg - 1。值得注意的是，ASC装置在10,000次循环后也显示出良好的容量保持率为94.45%。这些结果共同证实了三维互联纳米粒子网络在先进储能系统中的实际应用潜力。

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引用次数: 0

Correlation between spinel structure and electrochemical kinetic behavior of spinel ferrites 尖晶石结构与尖晶石铁氧体电化学动力学行为的关系

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-22 DOI: 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.

近年来的研究表明，尖晶石铁氧体具有独特的尖晶石结构，具有容量大、成本低、资源丰富等优点，有望成为锂离子电池负极材料。然而，尖晶石结构对尖晶石铁氧体电化学性能的影响尚不清楚。本文采用静电纺丝法制备了三种尖晶石铁素体，即正晶尖晶石ZnFe2O4、混合尖晶石MgFe2O4和逆晶尖晶石CoFe2O4纳米纤维，旨在研究尖晶石结构与其电化学动力学行为之间的关系。发现尖晶石铁氧体的尖晶石类型与放电过程中的初始电压平台和反应动力学有关。作为锂离子电池的阳极，ZFO电极具有最高的初始电压平台和优越的锂离子传输能力。这主要是由于Fe3+在正常尖晶石中占据了很大比例的八面体位置，这有利于锂离子向阳极晶格的迁移。这项工作促进了对尖晶石结构对电池性能影响的理解，使有针对性地合成优化材料以提高锂离子电池的性能。

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引用次数: 0

Exploration of Zn2+/Co2+ cation at tetrahedral sites in spinel manganites as a battery-type electrode for prospective application in supercapattery 尖晶石锰矿四面体上Zn2+/Co2+阳离子作为电池型电极在超级电池中的应用前景

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-22 DOI: 10.1016/j.jelechem.2026.119871

Steffy Backianathan, Jeyabharathi Arockiasamy, Sutharthani Kannan, Suba Devi Rengapillai, Sivakumar Marimuthu

The trait of spinel manganites with cation substitution at tetrahedral sites was deliberately analyzed in the application panorama for future high-power energy storage systems. ZnMn₂O₄ and CoMn₂O₄ were synthesized via sol-gel method and followed by thermal treatment. The divalent Zn and multivalent Co cation substitution at tetrahedral localities significantly affect the electrochemical performance of spinel manganites. The grades of electrochemical tests determine that ZnMn₂O₄ and CoMn₂O₄ were categorized as the typical battery-grade electrode material. ZnMn₂O₄ reveals an enhanced specific capacity may due to the extension of diffusion channels, which paves a way for insertion/extraction of ions at the solid electrolyte interphase and the synergy between the zinc and manganese cations. The electroactive material ZnMn₂O₄ exhibits a specific capacity of 232 C g⁻¹ at a current density of 1 A g⁻¹ and a cyclic durability test was carried out to discern the capacity retention of 81.4% even after 5000 cycles. Fabricated asymmetric hybrid device unveils an energy density of 51.5 Wh Kg⁻¹ with a power density of 1123 W Kg⁻¹. Thus, the spinel Zinc manganite shows extensive electrochemical characteristics for high-performance energy storage system.

分析了四面体阳离子取代尖晶石锰酸盐的特性，展望了其在未来大功率储能系统中的应用前景。采用溶胶-凝胶法制备了ZnMn2O4和CoMn2O4，并对其进行了热处理。在四面体位置的二价Zn和多价Co阳离子取代对尖晶石锰矿的电化学性能有显著影响。电化学等级测试确定ZnMn2O4和CoMn2O4为典型的电池级电极材料。ZnMn2O4的比容量增强可能是由于扩散通道的扩展，这为离子在固体电解质界面的插入/提取以及锌锰阳离子之间的协同作用铺平了道路。电活性材料ZnMn2O4在电流密度为1 a g−1时的比容量为232 C g−1，循环耐久性测试表明，即使在5000次循环后，其容量保持率仍为81.4%。制备的非对称混合器件的能量密度为51.5 Wh Kg−1，功率密度为1123 W Kg−1。因此，尖晶石锌锰矿具有广泛的电化学特性，可用于高性能储能系统。

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引用次数: 0

A novel physical criterion for modeling repassivation based on an extended point defect model 基于扩展点缺陷模型的再钝化建模新物理准则

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-22 DOI: 10.1016/j.jelechem.2026.119838

Nikos Alexiadis , Alexander Fuchs , Torsten Troßmann , Jorg Thöming , Fabio La Mantia

The ability of metals to re-form passive films is crucial for ensuring the longevity and reliability of critical components in demanding environments. Building on an extended Point Defect Model (PDM) considering chloride ion induced passive film breakdown, we introduce a physical criterion to model the dynamics of self-healing from a depassivated state. The stainless steel AISI 316 L was selected due to its practical relevance and the availability of published data demonstrating the dependence of repassivation on environmental factors. Cyclic voltammetry (CV) sweeps under varying chloride ion concentrations, temperatures, pH values and scan rates were simulated using the enhanced extended PDM. The predicted shifts in key electrochemical system responses, such as corrosion current, open circuit potential, induction time, critical breakdown potential and the repassivation potential, align well with literature findings. Furthermore, the model predicts passive film breakdown at low potentials, a phenomenon consistent with both experimental observations and fundamental thermodynamics. The capability to forecast passive film breakdown and repassivation facilitates optimal material selection and thus enhances component operation under transient environmental loads.

金属重新形成钝化膜的能力对于确保关键部件在苛刻环境中的寿命和可靠性至关重要。在考虑氯离子诱导钝化膜击穿的扩展点缺陷模型（PDM）的基础上，我们引入了一个物理准则来模拟钝化膜自愈的动力学过程。选择不锈钢AISI 316 L是由于其实际相关性和公开数据的可用性，证明了再钝化对环境因素的依赖性。利用增强型扩展PDM模拟了不同氯离子浓度、温度、pH值和扫描速率下的循环伏安法（CV）扫描。预测的关键电化学系统响应的变化，如腐蚀电流、开路电位、感应时间、临界击穿电位和再钝化电位，与文献研究结果一致。此外，该模型预测了低电位下钝化膜的击穿，这一现象与实验观察和基本热力学一致。预测钝化膜击穿和再钝化的能力有助于优化材料选择，从而提高组件在瞬态环境负载下的运行。

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引用次数: 0

A mini review on sweat activation: common and uncommon strategies 汗液激活的一个小回顾：常见和不常见的策略

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-01-22 DOI: 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.

人体汗液是一种有吸引力的非侵入性健康状况评估生物流体。它含有广泛的生物标志物（电解质、代谢物、营养物质、多肽、蛋白质等），提供有关身体组织和器官功能的宝贵信息。这篇迷你综述调查了可能的排汗策略，除了常见的策略之外，重点关注它们的主要优点和缺点，这些优点和缺点与可穿戴设备的精心设计和持续监测的机会有关。尽管在汗液传感、微电子、工程和数据处理以及营销商业补丁方面取得了进展，但真正的诊断可穿戴设备仍然是未来研究的问题。一个可能的障碍可能源于大多数出汗激活程序仍然是保守的。解决更广泛的不同汗液激活方法的主要特点，有望促进创新采样和新一代可穿戴传感器的研究。

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