Journal of Electroanalytical Chemistry最新文献_第4页

Eu-Mo dual-doping in dual-phase systems: Toward enhanced electrochromic performance of WO3 films for smart windows 双相体系中Eu-Mo双掺杂：增强WO3薄膜的电致变色性能

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-10 DOI: 10.1016/j.jelechem.2026.119941

Chengyang Bao , Zhonghao Zhou , Shuyue Ji , Xiangru Yin , Qiqi Mei , Guixiang Yang , Zhiyi Duan , Xiaoping Liang

Eu-doped crystalline (Eu-c-WO₃) films were prepared on ITO glass via a heat treatment-assisted hydrothermal method, and Mo-doped amorphous (Mo-a-WO₃) films were electrodeposited thereon to construct Mo-a-WO₃/Eu-c-WO₃ dual-doped dual-phase laminated films. The effects of Eu doping on the structure and electrochromic performance of crystalline WO₃, as well as the synergistic performance of the dual-doped dual-phase laminated films and their assembled devices, were systematically investigated. Results showed that the 10 mol% Eu-c-WO₃ film exhibited optimal electrochromic performance: its coloring/bleaching response time (t_c /t_b) was 4.21 s/6.97 s (faster than undoped c-WO₃), bleached transmittance at 633 nm was 80.1% with an optical modulation (ΔT) of 33.6%, and good cycling stability after 2000 cycles. The oxidation/reduction Li⁺ diffusion coefficients reached 5.12 × 10⁻¹¹/7.33 × 10⁻¹¹ cm²/s, which were attributed to the doping of Eu³⁺ inducing lattice defects that facilitate ion migration. 3Mo-a-WO₃/10Eu-c-WO₃ laminated film achieved further performance enhancement: compared with the undoped a-WO₃/c-WO₃ reference system, its t_c/t_b was shortened to 2.9 s/5.8 s, with a ΔT of 71.1% and a coloration efficiency (CE) as high as 78.2 cm²·C⁻¹, while retaining stable performance after 2000 cycles, which was attributed to the synergistic effect of dual-doped and dual-phase complementarity. Electrochromic devices (ECDs) assembled with 3Mo-a-WO₃/10Eu-c-WO₃ laminated film as the working electrode, ITO glass as the counter electrode, and 1 mol/L LiClO₄/PC as the electrolyte exhibited t_c/t_b of 3.2 s/6.3 s, CE of 69.5 cm²·C⁻¹, and ΔT of 65.2%, respectively. This work provides a feasible strategy for developing high-performance electrochromic materials, laying a solid foundation for the industrial application of electrochromic smart windows.

采用热处理辅助水热法在ITO玻璃表面制备了eu掺杂结晶（Eu-c-WO3）膜，并在其上电沉积mo掺杂非晶（Mo-a-WO3）膜，构建Mo-a-WO3/Eu-c-WO3双掺杂双相层合膜。系统研究了Eu掺杂对WO3晶体结构和电致变色性能的影响，以及双掺杂双相层合膜及其组装器件的协同性能。结果表明，10 mol%的Eu-c-WO3薄膜表现出最佳的电致变色性能，其着色/漂白响应时间（tc /tb）为4.21 s/6.97 s（比未掺杂的c-WO3快），633 nm处漂白透过率为80.1%，光调制（ΔT）为33.6%，2000次循环后具有良好的循环稳定性。氧化还原Li+的扩散系数达到5.12 × 10−11/7.33 × 10−11 cm2/s，这是由于掺杂了Eu3+诱导的晶格缺陷促进了离子的迁移。3Mo-a-WO3/10Eu-c-WO3层合膜的性能进一步增强：与未掺杂的a- wo3 / C - wo3参比体系相比，其tc/tb缩短至2.9 s/5.8 s， ΔT为71.1%，显色效率（CE）高达78.2 cm2·C−1，在2000次循环后仍保持稳定的性能，这归功于双掺杂和双相互补的协同作用。以3Mo-a-WO3/10Eu-c-WO3层合膜为工作电极，ITO玻璃为反电极，1 mol/L LiClO4/PC为电解液组装的电致变色器件的tc/tb值分别为3.2 s/6.3 s， CE值为69.5 cm2·C−1，ΔT值为65.2%。本研究为开发高性能电致变色材料提供了可行的策略，为电致变色智能窗的产业化应用奠定了坚实的基础。

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引用次数: 0

Optimization of a convolutional neural network for system identification in electrochemical impedance spectroscopy 电化学阻抗谱系统辨识的卷积神经网络优化

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-01-30 DOI: 10.1016/j.jelechem.2026.119893

Fermín Sáez-Pardo, Juan José Giner-Sanz, Valentín Pérez-Herranz

Electrochemical Impedance Spectroscopy (EIS) is a well-stablished electrochemical technique. Commonly, EIS data is analyzed using the Equivalent Electrical Circuit (EEC) approach, which consists in developing a physically sound EEC that can fit the impedance data. The first step to propose an EEC is the identification of the system. In EIS, the first stage of the identification of the system consists in quantifying the number of time constants of the system. Commonly, the identification of the system is carried out using either the visual method or the Distribution of Relation Times (DRT) method. For the identification of an individual EIS spectrum, both methods can yield reliable results when performed by an expert. However, for large databases of EIS spectra, their application becomes time-consuming and impractical.

In this work, a Convolutional Neural Network (CNN) was optimized for system identification of purely capacitive EIS spectra. The optimization was conducted using a two-stage Design of Experiments (DoE). The first stage optimized the convolutional network; and then, the second stage optimized the dense network. At the end of the optimization process, an optimized CNN with an overall test accuracy of 92.5% (above 98% for spectra containing 1 or 2 time constants; and above 80% for spectra containing 3 or 4 time constants) was obtained. The algorithm developed in this work is a math-free (from the user's perspective) and reproducible alternative to both, visual and DRT methods, for system identification in EIS. Besides, when applied to large databases of EIS spectra, the new algorithm can be easily automated, whereas the traditional methods cannot.

电化学阻抗谱（EIS）是一种成熟的电化学技术。通常，EIS数据使用等效电路（EEC）方法进行分析，该方法包括开发一个物理上健全的EEC，可以拟合阻抗数据。提出EEC的第一步是系统的识别。在EIS中，系统辨识的第一阶段是量化系统的时间常数的数目。通常，系统的识别是使用可视化方法或关系时间分布（DRT）方法进行的。对于单个EIS谱的识别，如果由专家执行，这两种方法都可以产生可靠的结果。然而，对于大型EIS光谱数据库，其应用变得耗时且不切实际。在这项工作中，优化了卷积神经网络（CNN）用于纯电容性EIS光谱的系统识别。采用两阶段实验设计（DoE）进行优化。第一阶段对卷积网络进行优化；然后，第二阶段对密集网络进行优化。优化过程结束时，得到的优化CNN总体测试精度为92.5%（包含1或2个时间常数的光谱测试精度在98%以上，包含3或4个时间常数的光谱测试精度在80%以上）。在这项工作中开发的算法是一种无数学（从用户的角度来看）和可重复的替代方法，视觉和DRT方法，用于EIS中的系统识别。此外，当应用于大型EIS光谱数据库时，新算法易于实现自动化，而传统方法则无法实现自动化。

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引用次数: 0

Electrode kinetics of the ferrocyanide-ferricyanide couple 铁氰化物-铁氰化物偶联的电极动力学

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-11 DOI: 10.1016/j.jelechem.2026.119936

Ilona Felhősi, Tamás Pajkossy

At first sight, the redox reactions of the hexacyano-ferrate species in aqueous solutions on noble metal electrodes are fast, simple, outer-sphere electron transfer with no intermediates. Accordingly, the cyclic voltammograms, CVs, of this system are of the form of “quasi-reversible”, diffusion-affected charge transfer. However, it is known for decades that redox potential and electron exchange rates depend on the cation of the base electrolyte and on its concentration. This implies some complexity in this redox process. To explore the kinetics and reaction mechanism, CV and dynamic electrochemical impedance spectroscopy measurements have been performed in ferrocyanide– or ferricyanide–containing

{Li}_{2} S O_{4}

base electrolytes of varied concentrations. The CVs were analysed using Pajkossy's recently elaborated procedure for decoupling diffusion and charge transfer. This procedure enables the determination of charge transfer rate coefficients for both oxidation and reduction processes separately. The rate of the reduction process was found to be proportional to the

{Li}_{2} S O_{4}

concentration, whereas the oxidation rate is independent of it. Based on this finding, the following mechanism is suggested: the ferrocyanide oxidation proceeds directly, whereas the formation of an associate species with a Li⁺ cation precedes the ferricyanide reduction.

表面上看，高铁酸盐在贵金属电极上的氧化还原反应是快速、简单的外球电子转移，不需要中间体。因此，该系统的循环伏安图（cv）具有“准可逆”的形式，受扩散影响的电荷转移。然而，几十年来人们都知道氧化还原电位和电子交换速率取决于碱性电解质的阳离子及其浓度。这意味着这个氧化还原过程有一定的复杂性。为了探索反应动力学和反应机理，在不同浓度含亚铁氰化物或含亚铁氰化物的Li2SO4碱电解质中进行了CV和动态电化学阻抗谱测量。使用Pajkossy最近阐述的解耦扩散和电荷转移程序分析了cv。这个程序能够分别测定氧化和还原过程的电荷转移速率系数。还原过程的速率与Li2SO4浓度成正比，而氧化速率与Li2SO4浓度无关。基于这一发现，提出了以下机制：亚铁氰化物氧化直接进行，而与Li+阳离子的缔合物的形成先于亚铁氰化物还原。

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引用次数: 0

Li6.4Al0.2La3Zr2O11.7F0.6 solid electrolytes for high performance solid-state batteries 高性能固态电池用固体电解质Li6.4Al0.2La3Zr2O11.7F0.6

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-09 DOI: 10.1016/j.jelechem.2026.119933

Yanzhu Zhang , Yaocong Wang , Quande Che , Dongxu Mao , Hao Zhang , Xundao Liu , Zhengmao Ye , Dehua Dong , Jiajie Li

Li₇La₃Zr₂O₁₂ (LLZO) represent promising materials for high energy density batteries, yet their practical implementation has been limited by poor interfacial compatibility with lithium metal. Herein, we successfully synthesized an Li_6.4Al_0.2La₃Zr₂O_11.7F_0.6 (AF_0.2-LLZO) solid-state electrolyte which has a cubic phase and inhibits Li₂CO₃ formation. As a result, the synthesized material achieves a high room-temperature ionic conductivity of 4.76 × 10⁻⁴ S cm⁻¹ alongside outstanding stability at the lithium metal interface. Density of states calculations results revealed that the LiF bonding environment is favorable for Li⁺ conduction and could contribute to enhanced ionic conductivity. The symmetric cell used AF_0.2-LLZO as electrolyte achieves a critical current density of 0.8 mA cm⁻² at 25 °C and maintains stable cycles for over 2800 h at 30 °C and 0.1 mA cm⁻². Moreover, the LiFePO₄|AF_0.2-LLZO|Li half-cell exhibits excellent electrochemical stability, with a capacity retention of 86.3% over 500 cycles at 1C under ambient conditions. At 4C over 500 cycles, the cell exhibits over 90% capacity retention. Our results demonstrate that Al/F co-doping into the LLZO lattice enhances the electrolyte/anode wettability and suppresses lithium dendrite growth, leading to a substantially extended battery cycle life.

Li7La3Zr2O12 （LLZO）是一种很有前途的高能量密度电池材料，但其实际应用受到与锂金属界面兼容性差的限制。本文成功地合成了Li6.4Al0.2La3Zr2O11.7F0.6 （AF0.2-LLZO）固态电解质，该电解质具有立方相并能抑制Li2CO3的形成。结果表明，合成材料的室温离子电导率为4.76 × 10−4 S cm−1，并且在锂金属界面处具有出色的稳定性。态密度计算结果表明，LiF键合环境有利于Li+的传导，有利于离子电导率的提高。使用AF0.2-LLZO作为电解液的对称电池在25°C时达到0.8 mA cm - 2的临界电流密度，在30°C和0.1 mA cm - 2下保持超过2800 h的稳定循环。此外，LiFePO4|AF0.2-LLZO|Li半电池表现出优异的电化学稳定性，在环境条件下，在1C下循环500次，容量保持率为86.3%。在4C超过500次循环，电池显示超过90%的容量保持。我们的研究结果表明，Al/F共掺杂LLZO晶格增强了电解质/阳极的润湿性，抑制了锂枝晶的生长，从而大大延长了电池的循环寿命。

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引用次数: 0

Construction of Cu2Se|Ni foam|Ag Lithiophilic framework for dendrite-free Lithium metal anodes 无枝晶锂金属阳极Cu2Se|Ni泡沫|Ag亲锂框架的构建

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-08 DOI: 10.1016/j.jelechem.2026.119924

Rongguan Lv , Longfei Li , Yuan Xiao , Youming Guo , Yiming Zhang , Yongjun He , Huayu Wu , Haiyan Yu , Fang Guo , Ming Chen

Structurally graded matrices with differential lithium affinity of cuprous selenide (Cu₂Se) | nickel foam (NF) | silver (Ag) (the abbreviation is CSNFA) were synthesized by a single-sided seleniumization reaction and in-situ replacement reaction. By leveraging the distinct lithium affinity of the framework's layers, lithium ions were directed to preferentially nucleate on the lower layer Cu₂Se with a higher affinity for lithium, thus enabling uniform lithium deposition. This composite anode can effectively suppress the formation of lithium dendrites and significantly improve its electrochemical performance. The half-cell based on CSNFA gradient scaffold can stably cycle for 390 times under 1 mA cm⁻² and 1 mAh cm⁻², with a low nucleation overpotential of 10.4 mV and Coulombic efficiency maintained at 98.98%. The symmetrical cell assembled with this anode demonstrated a long cycle life of 800 h under the conditions of 1 mA cm⁻² and 5 mAh cm⁻², powerfully demonstrating its excellent electrochemical stability. Finally, using LCSNFA and LiFePO₄ serving as the anode and the cathode, respectively, the full cell displays good rate capability and cycle stability. The results confirmed the practical viability of gradient lithiophilic architectures for enhancing the performance and stability of anodes in lithium metal batteries.

采用单侧硒化反应和原位取代反应合成了硒化亚铜（Cu2Se） |泡沫镍（NF） |银（Ag）（简称CSNFA）具有不同锂亲和度的梯度结构基质。通过利用框架层独特的锂亲和性，锂离子被引导到对锂具有更高亲和性的下层Cu2Se上优先成核，从而实现均匀的锂沉积。该复合阳极可以有效抑制锂枝晶的形成，显著提高其电化学性能。基于CSNFA梯度支架的半电池在1 mA cm−2和1 mAh cm−2下可稳定循环390次，成核过电位低至10.4 mV，库仑效率保持在98.98%。在1 mA cm−2和5 mAh cm−2的条件下，对称电池的循环寿命达到800 h，有力地证明了其优异的电化学稳定性。最后，采用LCSNFA和LiFePO4分别作为阳极和阴极，该电池具有良好的倍率性能和循环稳定性。结果证实了梯度亲锂结构在提高锂金属电池阳极性能和稳定性方面的实际可行性。

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引用次数: 0

Study on the OER performance of graphite-supported NiFe2O4 derivative catalysts prepared by in-situ carbothermal reduction method 原位碳热还原法制备石墨负载NiFe2O4衍生物催化剂OER性能研究

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-11 DOI: 10.1016/j.jelechem.2026.119946

Tian-long Hu , Yue-xin Meng , Kuan-kuan Li , Xin-lin Ren , Yan-yan Zhang , Peng-zhao Gao , Han-ning Xiao

Enhancing the oxygen evolution reaction (OER) performance of catalysts through composition optimization and structural design is an important direction in electrocatalytic water splitting research. In this study, nickel‑iron oxide (NiFe₂O₄) nanospheres synthesized by a sol-gel method were used as precursors to prepare graphite sheet-supported nano‑nickel‑iron alloy catalysts (NF/G) via an in-situ carbothermal reduction method. The effects of carbothermal reduction temperature on the catalyst's composition, microstructure, and OER performance were systematically investigated. The results show that the nano‑nickel‑iron alloy catalyst obtained at 1000 °C (Fe_0.64Ni_0.36/G-1000) exhibits the best OER performance, with overpotentials of 220, 316, and 380 mV at current densities of 10, 100, and 200 mA cm⁻², respectively, a Tafel slope of 86.61 mV dec⁻¹, and excellent stability (only a 5% decline over 100 h). This performance is significantly better than that of similar catalysts. The superior performance is attributed to three main factors: First, Fe_0.64Ni_0.36/G-1000 possesses the highest content of the active phases, Ni³⁺ (21.15 mol%) and Fe³⁺ (68.60 mol%), leading to high intrinsic OER activity. Second, the difference in electronegativity between Ni³⁺ (1.695) and Fe³⁺ (1.651) creates a NiOOH → FeOOH micro-electric field within the catalyst, facilitating charge transfer during OER. Third, the highly active amorphous FeOOH layer formed on the Fe_0.64Ni_0.36 surface features Fe³⁺ with high coordination numbers and low oxidation potential. Under an external electric field, it establishes a low-energy-barrier Fe³⁺ ↔ Fe⁴⁺ detour pathway, which optimizes the high-energy-barrier direct pathway Ni³⁺ → Ni⁴⁺, thereby significantly reducing the reaction energy barrier of the rate-determining step (*O → *OOH) in OER. This leads to a notable decrease in the catalyst's overpotential and Tafel slope. This study provides a new synthesis strategy and theoretical foundation for designing efficient and stable OER electrocatalysts.

通过成分优化和结构设计来提高催化剂的析氧反应性能是电催化水分解研究的一个重要方向。本研究以溶胶-凝胶法合成的NiFe2O4纳米球为前驱体，采用原位碳热还原法制备了石墨片负载纳米镍铁合金催化剂（NF/G）。系统研究了碳热还原温度对催化剂组成、微观结构和OER性能的影响。结果表明，在1000℃（Fe0.64Ni0.36/G-1000）下制备的纳米镍铁合金催化剂表现出最佳的OER性能，在电流密度为10、100和200 mA cm−2时，过电位分别为220、316和380 mV， Tafel斜率为86.61 mV dec−1，稳定性良好（100 h内仅下降5%）。该性能明显优于同类催化剂。研究表明，Fe0.64Ni0.36/G-1000的活性相中Ni3+ (21.15 mol%)和Fe3+ (68.60 mol%)含量最高，具有较高的OER活性。其次，Ni3+(1.695)和Fe3+(1.651)的电负性差异在催化剂内部形成了NiOOH→FeOOH微电场，促进了OER过程中的电荷转移。第三，在Fe0.64Ni0.36表面形成的高活性非晶态FeOOH层具有高配位数、低氧化电位的Fe3+。在外加电场作用下，建立低能垒Fe3+↔Fe4+迂回路径，使高能垒Ni3+→Ni4+直接路径得到优化，从而显著降低OER中决定速率步骤（*O→*OOH）的反应能垒。这导致催化剂的过电位和塔菲尔斜率显著降低。该研究为设计高效、稳定的OER电催化剂提供了新的合成策略和理论基础。

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引用次数: 0

Zn-substituted MnHCF suppresses the Jahn–Teller distortion and enhances ionic conductivity 锌取代的MnHCF抑制了Jahn-Teller畸变，提高了离子电导率

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-03 DOI: 10.1016/j.jelechem.2026.119923

Zu-Tao Pan , Bo Li , Yao Xu , Ling-Bin Kong

In recent years, Prussian blue analogs (PBAs) have attracted significant attention as cathode materials for sodium-ion batteries due to their low cost and high theoretical specific capacity. In particular, manganese-based PBAs (MnHCF) have a double-electron reaction mechanism, a high discharge platform, and a high theoretical specific capacity, providing higher energy density. However, MnHCF has always been affected by Mn's Jahn–Teller distortion (JTD), resulting in poor stability. Here, we adopt non-redox-active Zn²⁺ to replace Mn to inhibit JTD. The 0.2-replaced Mn_0.8Zn_0.2HCF exhibits the best cycle stability. After 1000 cycles at 850 mA/g, the capacity retention rate was 73.2%, which was better than the 33.2% of MnHCF. The inhibition of JTD originates from the stabilization of MnN bonds and FeC bonds after Zn substitution and the reduction in volume change after long cycles. In addition, the ionic conductivity of Mn_0.8Zn_0.2HCF has doubled, strengthening its ionic transport capability and improving its rate performance. This Zn substitution strategy further enriches the optimization methods for inhibiting JTD and enhancing ionic conductivity.

近年来，普鲁士蓝类似物（Prussian blue analogas, PBAs）以其低廉的成本和较高的理论比容量成为钠离子电池正极材料的研究热点。特别是锰基PBAs （MnHCF）具有双电子反应机制、高放电平台和高理论比容量，提供了更高的能量密度。然而，MnHCF一直受到Mn的Jahn-Teller畸变（JTD）的影响，导致稳定性较差。在这里，我们采用非氧化还原活性的Zn2+代替Mn来抑制JTD。以0.2取代的Mn0.8Zn0.2HCF表现出最佳的循环稳定性。在850 mA/g下循环1000次后，容量保持率为73.2%，优于MnHCF的33.2%。JTD的抑制作用源于Zn取代后MnN键和FeC键的稳定以及长周期后体积变化的减小。此外，Mn0.8Zn0.2HCF的离子电导率提高了一倍，增强了其离子传输能力，提高了其速率性能。这种Zn取代策略进一步丰富了抑制JTD和提高离子电导率的优化方法。

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引用次数: 0

Biomass-derived carbon electrocatalysts for oxygen evolution reaction: Progress and perspective 生物质源碳电催化剂的析氧反应：进展与展望

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-01-16 DOI: 10.1016/j.jelechem.2026.119837

Yeqingyu Lin , Weixuan Dai , Jiayu Cao , Yongkun Zou , Cong Feng , Huan Liu

The Oxygen Evolution Reaction (OER) is a critical electrochemical reaction in water-splitting systems for achieving highly efficient clean production and storage. In this regard, biomass-derived carbon electrocatalysts have emerged as a promising candidate for OER due to their high surface areas, tunable porosity, large pore volume, and easy functionalization. This review provides a systematic analysis of recent advancements in biomass-derived carbon electrocatalysts, with special emphasis on their applications in OER. We begin by highlighting the fundamentals of biomass-derived carbon OER electrocatalysts and then summarize typical synthesis methods for preparing biomass-derived carbon materials. Subsequently, we present a thorough analysis of the key factors including the structural characteristics, chemical composition, synthesis/ modification strategies of biomass-derived carbon materials on their electrocatalysts performance during OER. The review provides the first systematic summary of the application of biomass-derived carbon materials in OER, which has attracted much interest in this field. Finally, we discuss the future prospects and remaining challenges of biomass-derived carbon materials for OER electrocatalysts.

析氧反应（OER）是水分解系统中实现高效清洁生产和储存的关键电化学反应。在这方面，生物质衍生的碳电催化剂由于其高表面积、可调孔隙率、大孔隙体积和易于功能化而成为OER的有希望的候选者。本文综述了近年来生物质碳电催化剂的研究进展，重点介绍了其在OER中的应用。首先介绍了生物质碳OER电催化剂的基本原理，然后总结了制备生物质碳材料的典型合成方法。随后，我们深入分析了影响OER电催化剂性能的关键因素，包括结构特征、化学成分、合成/改性策略等。本文首次系统综述了生物质碳材料在OER中的应用，引起了该领域的广泛关注。最后，我们讨论了用于OER电催化剂的生物质碳材料的未来前景和仍然存在的挑战。

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引用次数: 0

An artificial MXene/TiO2 heterojunction coating layer enabling highly reversible Zn anodes 一种制备高可逆锌阳极的MXene/TiO2异质结涂层

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-04 DOI: 10.1016/j.jelechem.2026.119916

Yong Liu , Penghui Zhai , Fei Wang , Binrui Xu , Mingliang He , Bo Zhao , Yifei Pei , Jian Cui , Xiaobin Sun , Cheng Zhang , Fengzhang Ren , Wanhong Zhang

Aqueous zinc-ion batteries (AZIBs) are one of the most promising energy storage technologies due to their high safety, low cost, and environmental friendliness. However, challenges such as dendrite growth, hydrogen evolution reactions, and anode-electrolyte side reactions hinder the further development of AZIBs. Herein, we introduce a functional MXene/TiO₂ heterojunction artificial coating layer, and the zincophilic properties of TiO₂ and the MXene/TiO₂ heterojunction of this coating layer provide abundant zincophilic sites, promoting uniform Zn deposition and effectively suppressing dendrite growth on the Zn anode. Additionally, the constructed MXene/TiO₂ SEI isolates the aqueous ZnSO₄ electrolyte from the zinc anode, protecting it from corrosion. As a result, the MXene/TiO₂@Zn anode exhibits enhanced long-term cycling performance, achieving 1200 h at a current density of 0.2 mA cm⁻² and 0.2 mAh cm⁻². The MXene/TiO₂@Zn anode also demonstrates excellent plating/stripping behavior over 400 cycles on Cu foil. Moreover, the assembled MXene/TiO₂@Zn/MnO₂ and MXene/TiO₂@Zn/NH₄V₄O₁₀ full cells show significantly improved long-term cycling stability and high capacity retention. This strategy offers a highly reversible zinc anode, paving the way for the future development of rechargeable AZIBs.

水锌离子电池（azib）由于其高安全性、低成本和环境友好性，是最有前途的储能技术之一。然而，枝晶生长、析氢反应和阳极电解质副反应等挑战阻碍了azib的进一步发展。在此，我们引入了功能性MXene/TiO2异质结人工涂层，TiO2的亲锌特性和该涂层的MXene/TiO2异质结提供了丰富的亲锌位点，促进了均匀的Zn沉积，并有效抑制了Zn阳极上的枝晶生长。此外，构建的MXene/TiO2 SEI将含水的ZnSO4电解质与锌阳极隔离开来，保护锌阳极免受腐蚀。因此，MXene/TiO2@Zn阳极表现出增强的长期循环性能，在0.2 mA cm - 2和0.2 mAh cm - 2的电流密度下达到1200小时。MXene/TiO2@Zn阳极在铜箔上也表现出优异的镀/剥离性能，超过400次循环。此外，组装的MXene/TiO2@Zn/MnO2和MXene/TiO2@Zn/NH4V4O10全电池具有显著提高的长期循环稳定性和高容量保持能力。这种策略提供了一种高度可逆的锌阳极，为可充电azib的未来发展铺平了道路。

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引用次数: 0

Local alkalisation and corrosion induced by the dissolution of Mg and Mg-based phases: in situ and real-time studies 由Mg和Mg基相溶解引起的局部碱化和腐蚀：现场和实时研究

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry

Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.jelechem.2026.119932

S. Zhang , V. Cruz de Faria , K. Nairn , M. Musameh , S. Thomas

A Mg²⁺ ion selective microelectrode (Mg²⁺ ISME) and a H⁺ ion selective microelectrode (H⁺ ISME) were used together to simultaneously track local [Mg²⁺] and pH over different Mg-containing substrates, in 0.1 M NaCl. Substrates included pure Mg, magnesium silicide (Mg₂Si), and AA6061 containing Mg₂Si surface particles. Measurements made with H⁺ ISMEs revealed that dissolution of Mg leads to significant local alkalisation, with local pH trending toward the equilibrium pH associated with Mg(OH)₂ precipitation. It was identified that such local alkalisation causes second-order effects, including dissolution of Al from the matrix in AA6061, and passivation of Mg by formation of protective Mg-oxides/hydroxides.

采用Mg2+离子选择性微电极（Mg2+ ISME）和H+离子选择性微电极（H+ ISME）在0.1 M NaCl溶液中同时跟踪不同含镁底物上的局部[Mg2+]和pH。衬底包括纯Mg、硅化镁（Mg2Si）和含有Mg2Si表面颗粒的AA6061。用H+ ISMEs进行的测量表明，Mg的溶解导致明显的局部碱化，局部pH趋于与Mg(OH)2沉淀相关的平衡pH。结果表明，这种局部碱化会导致二级效应，包括在AA6061中Al从基体中溶解，以及通过形成保护性的Mg氧化物/氢氧化物而使Mg钝化。

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