Electrochemistry Communications最新文献_第2页

Next-generation CoMoS3/carbon sphere nanoflower catalyst for sustainable hydrogen production through urea oxidation-assisted water electrolysis 新一代CoMoS3/碳球纳米花催化剂用于尿素氧化辅助水电解可持续制氢

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-23 DOI: 10.1016/j.elecom.2025.108102

Neshanth Vadivel , Mani Govindasamy , Arun Prasad Murthy , Chih-Yu Kuo

Development of effective and economical electrocatalysts for hydrogen production is of particular importance in sustainable energy policies. In this study, we present a novel cobalt molybdenum sulphide/carbon sphere (CoMoS₃/CS) nanoflower synthesized by a facile hydrothermal process that has a high electrochemically active surface area and dense catalytic sites. The CoMoS₃/CS rose-like nanoflower catalyst has excellent trifunctional activity towards the hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and urea oxidation reaction (UOR). It shows a low HER overpotential of 93 mV at 10 mA cm², superior to that of CoS/CS (143 mV) and CS (242 mV). For UOR, the oxidation potential is 1.33 V vs. RHE with a Tafel slope of 49 mV dec¹ and an OER oxidation potential of 1.67 V with a Tafel slope of 64 mV dec¹. Both HER and UOR long-term electrochemical stability was established through chronoamperometry and voltammetry tests with little performance loss. In a hybrid water electrolysis configuration (HER || UOR), the catalyst facilitated effective hydrogen production with significantly lower cell voltage of 1.46 V compared to conventional HER || OER system. The incorporation of carbon spheres in this nanostructured catalyst improved the active surface area and facilitated synergistic interactions resulting in high catalytic activity, and durability. This study emphasizes the design of next generation electrocatalysts for hybrid water electrolysis to produce sustainable hydrogen.

开发高效经济的制氢电催化剂在可持续能源政策中具有特别重要的意义。在这项研究中，我们提出了一种新型的钴钼硫化/碳球纳米花（CoMoS3/CS），具有高的电化学活性表面积和密集的催化位点。CoMoS3/CS玫瑰状纳米花催化剂对析氢反应（HER）、析氧反应（OER）和尿素氧化反应（UOR）具有优异的三官能团活性。在10 mA cm2下，HER过电位为93 mV，优于CoS/CS （143 mV）和CS （242 mV）。对于UOR，氧化电位为1.33 V，相对于RHE， Tafel斜率为49 mV dec1， OER氧化电位为1.67 V， Tafel斜率为64 mV dec1。通过计时安法和伏安法测试，确定了HER和UOR的长期电化学稳定性，且性能损失很小。在混合水电解配置（HER || UOR）中，与传统的HER || OER系统相比，催化剂促进了有效的氢气生产，电池电压显著降低，为1.46 V。碳球在纳米结构催化剂中的掺入提高了活性表面积，促进了协同作用，从而提高了催化活性和耐久性。本研究的重点是设计用于混合水电解的下一代电催化剂，以产生可持续的氢。

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引用次数: 0

Mechanistic investigation of localized electrochemical corrosion in defective regions of CuNi alloys under dynamic marine environment using a φ0.1 mm wire beam electrode 采用φ0.1 mm线束电极研究海洋动态环境下CuNi合金缺陷区局部电化学腐蚀机理

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-21 DOI: 10.1016/j.elecom.2025.108101

Xuemei Wang , Qingdong Zhong , Yongle Xie , Shujian Zhang , Bin Xie , Lan Ma , Yucheng Yu

In this study, wire beam electrode technology, combined with electrochemical impedance spectroscopy (EIS) and surface morphology analysis, was employed to systematically investigate the localized corrosion behavior of depressed and protrusion defects on B18 CuNi alloy in a dynamic 3.5 wt% NaCl solution. The results demonstrate that the lowest region of the depressed defect and its upstream side exhibit intense anodic dissolution due to enhanced turbulent mass transfer and cl⁻ enrichment, with the local corrosion intensity index reaching 0.35 within 24 h. Vortex impacts induced by fluid separation on the downstream side of convex defects lead to greater corrosion depth compared to the top region. Compared with the protrusion defect features, upstream side beneath the depressed features exhibits a higher density of localized anodic sites and larger current values. This observation confirms that samples with shallower defect depths tend to experience more pronounced radial deepening. EIS and surface roughness analyses further reveal that shear forces disrupt the dynamic evolution of the double-layer structure of corrosion product films. Collectively, these findings elucidate the local corrosion mechanisms under the synergistic influence of dynamic interference and electrochemical processes

本研究采用线束电极技术，结合电化学阻抗谱（EIS）和表面形貌分析，系统研究了B18 CuNi合金在3.5 wt% NaCl动态溶液中凹陷和突出缺陷的局部腐蚀行为。结果表明：由于湍流传质增强和cl−富集，凹陷缺陷的底部及其上游表现出强烈的阳极溶解，局部腐蚀强度指数在24 h内达到0.35。流体分离引起的涡流冲击对凸起缺陷下游的腐蚀深度大于顶部区域。与突出缺陷特征相比，凹陷缺陷特征下方的上游侧具有更高的局部阳极位点密度和更大的电流值。这一观察证实，缺陷深度较浅的样品往往会经历更明显的径向加深。EIS和表面粗糙度分析进一步表明，剪切力破坏了腐蚀产物膜双层结构的动态演变。总的来说，这些发现阐明了动态干扰和电化学过程协同作用下的局部腐蚀机制

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引用次数: 0

A comment on “On the futility of the Fuoss–Kirkwood relation” 评《论福斯-柯克伍德关系的无用性》

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-18 DOI: 10.1016/j.elecom.2025.108100

Žiga Gradišar , Pavle Boškoski

Recently a point was made in this journal, that the well-known relation — the Fuoss–Kirkwood formula — between impedance of a causal, linear device and the pertaining distribution of relaxation times is futile. We point-out the incorrect use of relation and provide evidence that the formula is applicable when used correctly.

最近，本刊提出了一个观点，即众所周知的因果线性器件的阻抗与相应的弛豫时间分布之间的关系——福斯-柯克伍德公式——是无效的。我们指出了关系式的不正确使用，并提供了公式在正确使用时是适用的证据。

引用次数: 0

Study on hydrogen evolution performance of Pt-Co/NF composite electrodes with different mass ratios 不同质量比Pt-Co/NF复合电极析氢性能研究

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-15 DOI: 10.1016/j.elecom.2025.108096

Qian Yin, Jindong Sun, Jiaci Fan, Jinye Xia, Yue Chen

To reduce the cost of platinum electrodes for hydrogen production via water electrolysis, Ni-Pt-Co composite electrodes with trace amounts of Pt and Co deposited on a foam nickel substrate were fabricated using electrochemical deposition techniques, exhibiting varying mass ratios. The prepared NF electrodes, NiPt, NiCo, and Ni-Pt-Co composite electrodes were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electrochemical comparison tests and PEM hydrogen production experiments were conducted on NF electrodes, NiPt, NiCo, and Ni-Pt-Co composite electrodes with varying mass ratios using an electrochemical workstation. In situ hydrogen evolution performance was tested in PEM electrolytic cells, including polarization curves and power consumption analysis for different electrodes, supported by impedance spectroscopy. Results indicate that Pt and Co loading significantly affects hydrogen evolution catalytic activity in composite electrodes. Excessive deposition of either Pt or Co not only fails to enhance performance but may reduce catalytic efficiency. An optimal mass ratio exists among Ni, Pt, and Co. Based on the experimental results, the optimal ratio is 12:0.5:0.5. Compared to the composite electrode with m(Ni):m(Pt) = 12:1, the introduction of Co not only reduces Pt content but also enhances catalytic performance. Therefore, practical applications must prioritize identifying the optimal mass ratio for the supporting metal rather than blindly depositing metals quantitatively. This approach aims to enhance catalytic performance while reducing costs.

为了降低电解制氢铂电极的成本，采用电化学沉积技术在泡沫镍衬底上沉积微量Pt和Co，制备了不同质量比的Ni-Pt-Co复合电极。采用扫描电子显微镜（SEM）和x射线衍射仪（XRD）对制备的NF电极、NiPt、NiCo和Ni-Pt-Co复合电极进行了表征。利用电化学工作站对不同质量比的NF电极、NiPt、NiCo和Ni-Pt-Co复合电极进行了电化学对比试验和PEM制氢实验。在PEM电解电池中测试了原位析氢性能，包括极化曲线和不同电极的功耗分析，并在阻抗谱的支持下进行。结果表明，Pt和Co负载显著影响复合电极的析氢催化活性。过量沉积Pt或Co不仅不能提高性能，而且可能降低催化效率。Ni、Pt、Co三者之间存在一个最佳质量比，根据实验结果，最佳质量比为12:0.5:0.5。与m(Ni):m(Pt) = 12:1的复合电极相比，Co的引入不仅降低了Pt含量，而且提高了催化性能。因此，实际应用中必须优先确定支撑金属的最佳质量比，而不是盲目地定量沉积金属。这种方法旨在提高催化性能，同时降低成本。

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引用次数: 0

A novel electrochemical deposition of copper conductor on flexible printed circuit boards 一种在柔性印刷电路板上电化学沉积铜导体的方法

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-14 DOI: 10.1016/j.elecom.2025.108090

Wen Hsi Lee , Yi-Xue Chen , Hao Han Lin

This study employs a screen-printed aluminum paste to form electrode patterns on a substrate. Subsequently, a galvanic displacement reaction is utilized to replace the surface of the printed aluminum electrode with a copper seed layer. Finally, copper electroplating is performed to deposit copper onto the seed layer. This innovative additive aluminum-displacement-plus-electroplating process utilizes upward electroplating from the displacement-formed copper seed layer to enhance the electrical properties and smoothness of the copper conductor, while the downward electroplating strengthens the mechanical properties of the copper conductors.

To ensure the complete conversion of the printed aluminum electrodes into copper electrodes, crystalline copper sulfate powder is incorporated into the aluminum paste. After 20 min of displacement followed by 30 min of electroplating, the internal aluminum is fully converted into copper, producing a copper layer approximately 100 μm thick. The resulting copper exhibits a resistivity of 2 × 10⁻⁸ Ω·m.

Compared with conventional subtractive copper foil conductor processes, this method achieves comparable mechanical, chemical, and electrical properties. Furthermore, the simplified process reduces material waste and supports the pursuit of net-zero carbon emissions.

本研究采用丝网印刷铝浆在基板上形成电极图案。随后，利用电位移反应将印刷铝电极的表面替换为铜种子层。最后，电镀铜，将铜沉积在种子层上。这种创新的添加剂铝-位移+电镀工艺利用位移形成的铜籽层向上电镀来提高铜导体的电学性能和光滑度，而向下电镀则增强了铜导体的机械性能。为了保证印刷的铝电极完全转化为铜电极，在铝浆中加入结晶硫酸铜粉末。经过20分钟的位移和30分钟的电镀，内部铝完全转化为铜，形成约100 μm厚的铜层。所得铜的电阻率为2 × 10−8 Ω·m。与传统的减法铜箔导体工艺相比，该方法实现了相当的机械，化学和电学性能。此外，简化的过程减少了材料浪费，并支持追求净零碳排放。

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引用次数: 0

Exploring the sub-nanometre domain: Evaluating mass loading effects on platinum nanocluster catalysts fabricated via magnetron sputtering 探索亚纳米领域：评价磁控溅射制备的铂纳米团簇催化剂的质量负载效应

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-11 DOI: 10.1016/j.elecom.2025.108095

Richard O.D. Clark , Eman Alharbi , Gazi Aliev , Wolfgang Theis , Emerson C. Kohlrausch , Jesum Alves Fernandes , Neil V. Rees

Herein we demonstrate the use of magnetron-sputtered, low weight-loading platinum on carbon black catalysts as a pathway to reducing mass of platinum in electrolyser and fuel cell applications. In contrast to wet chemical methods, which often require multi-step syntheses involving toxic chemicals and washing post synthesis, magnetron sputtering can produce catalysts for use immediately after production. Scanning transmission electron microscope (STEM) analysis shows these bespoke catalysts possess a bimodal distribution of particle sizes, with nanoparticles approximately half the size of commercial equivalents (ca.1 vs > 2 nm) and a distinct distribution of single metal atoms, dimers and trimers. Measurement of the electrochemically active surface area (ECSA) revealed a higher surface area across all fabricated catalysts, ranging from 17 % to 51 % higher than commercial equivalents. This increased surface area provides a comparable hydrogen evolution reaction (HER) onset potential at a fraction of the platinum loading, indicating both that kinetics are not affected measurably by changes in platinum size and that the Pt particles are well dispersed across the support. In contrast, the oxygen reduction reaction (ORR) activity showed clear kinetic differences due to particle size with the onset potential varying by over 100 mV across the catalyst samples, reflecting the influence of stable platinum nanoclusters on catalytic activity. Rotating ring disc electrode (RRDE) voltammetry offered additional insight into the size and dispersion of the platinum nanoclusters across the samples, elucidating differences between them

在此，我们展示了在炭黑催化剂上使用磁控溅射，低重量负载铂作为减少电解槽和燃料电池应用中铂质量的途径。湿化学法通常需要涉及有毒化学品和合成后洗涤的多步骤合成，与之相反，磁控溅射可以在生产后立即产生使用的催化剂。扫描透射电子显微镜（STEM）分析显示，这些定制的催化剂具有粒径的双峰分布，纳米颗粒尺寸约为商业当量的一半（约1纳米vs 2纳米），单金属原子、二聚体和三聚体的分布明显。电化学活性表面积（ECSA）的测量表明，所有制备的催化剂的表面积都比商业等价物高17%至51%。这种增加的表面积提供了相当的析氢反应（HER）开始电位，在铂负载的一小部分，这表明动力学不受铂尺寸变化的可测量影响，并且铂颗粒很好地分散在整个载体上。相比之下，氧还原反应（ORR）活性因催化剂粒径的不同而表现出明显的动力学差异，不同催化剂样品的起始电位相差超过100 mV，反映了稳定铂纳米团簇对催化活性的影响。旋转环盘电极（RRDE）伏安法为铂纳米团簇在样品中的大小和分散提供了额外的见解，阐明了它们之间的差异

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引用次数: 0

Navigating the complexities of electrocatalytic water splitting: a critical examination of pitfalls and considerations in performance evaluation 导航电催化水分解的复杂性：在性能评估陷阱和考虑的关键检查

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-08 DOI: 10.1016/j.elecom.2025.108094

Rana Said , Munthar Kadhim Abosaoda , Nathier Abas Ibrahim , M.M. Rekha , Subhashree Ray , Kattela Chennakesavulu , Renu Sharma , Atreyi Pramanik , Gurumurthy Ramaiah

Despite the rapid rise of electrocatalysis research, notably in hydrogen and oxygen evolution reactions (HER/OER), the discipline is still plagued by discrepancies in testing, data reporting, and performance benchmarking. This review examines the most important but sometimes ignored factors influencing catalyst performance, ranging from electrode preparation and electrolyte contaminants to the complexities of Tafel slope extraction and Faradaic efficiency measurement. This review critically examines the limitations of frequently used metrics, including overpotential, electrochemically active surface area (ECSA), and Tafel slopes, and demonstrates how uncontrollable variables can significantly distort reported activity. This study emphasizes the critical need for standardization by comparing normalization methods (geometric area, catalyst mass, and ECSA-based), as well as investigating how electrochemical impedance spectroscopy, double-layer capacitance, and product selectivity measurements are frequently misapplied or misinterpreted. We also highlight the worrying absence of raw data sharing and reproducibility in the literature, which impedes meaningful comparison and slows technological advancement. Finally, we offer a thorough checklist and protocols to build a universal benchmarking technique. This assessment, which highlights both technological insights and systemic obstacles, serves as a road map for a more transparent, reliable, and expedited electrocatalysis discovery process.

尽管电催化研究迅速兴起，特别是在氢和氧析反应（HER/OER）方面，但该学科在测试、数据报告和性能基准方面仍然存在差异。本文综述了影响催化剂性能的最重要但有时被忽视的因素，从电极制备和电解质污染物到塔菲尔斜率提取和法拉第效率测量的复杂性。这篇综述严格检查了常用指标的局限性，包括过电位、电化学活性表面积（ECSA）和Tafel斜率，并展示了不可控变量如何显著扭曲报告的活性。本研究通过比较标准化方法（几何面积、催化剂质量和基于ecsa的），以及研究电化学阻抗谱、双层电容和产品选择性测量如何经常被误用或误解，强调了标准化的迫切需要。我们还强调了文献中令人担忧的原始数据共享和可重复性的缺乏，这阻碍了有意义的比较并减缓了技术进步。最后，我们提供了一个全面的检查表和协议来构建一个通用的基准测试技术。该评估强调了技术见解和系统障碍，为更透明、可靠和快速的电催化发现过程提供了路线图。

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引用次数: 0

Effect of dopamine modification on the oxygen reduction reaction activity of Pt/C catalyst 多巴胺修饰对Pt/C催化剂氧还原反应活性的影响

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-04 DOI: 10.1016/j.elecom.2025.108093

Guoyu Shi , Donald A. Tryk , Akihiro Iiyama , Makoto Uchida , Hironori Osada , Katsuyoshi Kakinuma

Modifying Pt-based catalysts with organic molecules offers a promising strategy to enhance oxygen reduction reaction (ORR) performance. In this study, dopamine (DA) was used to modify Pt/C, and its impact on electrochemical behavior and ORR activity was systematically investigated. Through DA modification, the ORR activity can be improved to 1.5 times that of pristine Pt/C. This enhancement is linked to DA's ability to maintain a more metallic Pt surface by preventing excessive oxidation. Density functional theory (DFT) calculations indicate that DA binds moderately strongly to the Pt surface, based on π-bonds between Pt and the aromatic carbons in a flat configuration that partially covers the surface while leaving active sites accessible. DA effectively inhibits the formation of surface-blocking OH_top–OH_bridge pairs on (111) terraces, thus preserving O₂ adsorption sites at (110) edges and unpaired OH_top sites, which are necessary in the ORR. Thus, this work provides mechanistic insight into DA's function and suggests a practical route to improving fuel cell performance through organic–inorganic interface engineering.

用有机分子修饰pt基催化剂是提高氧还原反应（ORR）性能的一种很有前途的方法。本研究采用多巴胺（DA）修饰Pt/C，系统研究了其对电化学行为和ORR活性的影响。通过DA改性，ORR活性可提高到原始Pt/C的1.5倍。这种增强与DA通过防止过度氧化来保持更金属化的Pt表面的能力有关。密度泛函理论（DFT）计算表明，基于Pt和芳族碳之间的π键，DA与Pt表面的结合强度中等，其平面构型部分覆盖表面，但保留了活性位点。DA有效地抑制了（111）阶地上表面阻断OHtop - ohbridge对的形成，从而保留了（110）边缘的O2吸附位点和未配对的OHtop位点，这是ORR中必需的。因此，这项工作提供了对DA功能的机理洞察，并提出了通过有机-无机界面工程提高燃料电池性能的实用途径。

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引用次数: 0

Droplet corrosion of steel with simulated atmospheric dust from mixtures of ammonium salts 用铵盐混合物模拟大气粉尘对钢的液滴腐蚀

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-03 DOI: 10.1016/j.elecom.2025.108092

Lea Seeger, Renate Lobnig, Claudia Schöberl, Stephan Appel

The corrosion of steel with 100 μl droplets of 0.171 M solutions of various ammonium salts and their mixtures, simulating atmospheric dust, is compared to corrosion with NaCl.

The key methods are in-situ optical monitoring in a self-built air-conditioned observation chamber and under a microscope with humidity-control, as well as the determination of corrosion products and their crystallite sizes ex-situ using XRD.

The cations, Na⁺ or NH₄⁺ influence the width of the cathodic zone of the droplet and the occurrence of secondary spreading through the pH value of the resulting hydroxide solution in the cathodic zone.

Anions influence the resulting type of corrosion products, assumingly by incorporation in the intermediate product green rust. With Cl⁻ anions the detected corrosion product was γ-FeOOH, with SO₄²⁻ anions additionally α-FeOOH forms. Immediately after droplet application NO₃⁻ has a passivating effect, but as soon as active corrosion begins, NO₃⁻ actually accelerates it. The rapid corrosion with NO₃⁻ was assumed to be the reason for smaller crystallite sizes of the main corrosion product γ-FeOOH.

The mixture of the three anions Cl⁻, SO₄²⁻ and NO₃⁻, as found in atmospheric dust, leads to a synergistic effect. The aggressive anions Cl⁻ and SO₄²⁻ suppress the passivating effect of NO₃⁻anions leading to accelerated corrosion and the formation of a thick layer of magnetite, which do not form with single salt solutions.

在模拟大气粉尘的0.171 M不同铵盐及其混合物溶液中，用100 μl液滴对钢的腐蚀进行了比较，并与NaCl的腐蚀进行了比较。关键方法是在自建的空调观察室和湿度控制的显微镜下进行现场光学监测，以及利用x射线衍射法测定腐蚀产物及其晶体尺寸。阳离子Na+或NH4+影响液滴阴极区的宽度，并通过阴极区生成的氢氧根溶液的pH值影响二次扩散的发生。阴离子影响腐蚀产物的类型，假设是通过掺入中间产物绿锈。Cl -阴离子腐蚀产物为γ-FeOOH， SO42 -阴离子腐蚀产物为α-FeOOH。在液滴作用后，NO3−立即有钝化作用，但一旦活性腐蚀开始，NO3−实际上加速了腐蚀。NO3−的快速腐蚀是导致主要腐蚀产物γ-FeOOH晶粒尺寸较小的原因。在大气尘埃中发现的三种阴离子Cl−、SO42−和NO3−的混合会产生协同效应。侵略性阴离子Cl -和SO42 -抑制了NO3 -阴离子的钝化作用，加速了腐蚀，形成了一层厚的磁铁矿，这是单一盐溶液不能形成的。

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引用次数: 0

Influence of atomic layer deposition on nickel hydroxide phase transitions in nickel foam 原子层沉积对泡沫镍中氢氧化镍相变的影响

IF 4.2 3区工程技术 Q2 ELECTROCHEMISTRY

Electrochemistry Communications

Pub Date : 2025-12-03 DOI: 10.1016/j.elecom.2025.108091

Samutr Assavachin , Surat Prempluem , Somlak Ittisanronnachai , Sukritta Janprakhon , Montree Sawangphruk

This study investigates how Al₂O₃ and V₂O₅ coatings deposited on nickel foam by atomic layer deposition (ALD) modifies its electrochemical phase evolution in alkaline media. Phase transitions and surface kinetics were characterized using cyclic voltammetry (CV), in situ X-ray diffraction (XRD), electrochemical impedance spectroscopy (EIS), and Tafel analysis. Bare NF exhibits a positive cathodic peak shift for α-Ni(OH)₂ formation over 100 CV cycles attributed to surface activation. NF coated with Al₂O₃ (NF-A) showed a larger shift (+90 mV) indicating enhanced charge transfer kinetics and reduced energy barrier. In contrast, V₂O₅-coated NF (NF-V) showed no shift suggesting a suppressed surface kinetics. These shifts disappear at higher scan rates suggesting a kinetic effect rather than a diffusion-induced behavior. Tafel and EIS measurements show that NF-A has the lowest charge transfer resistance, while NF-V exhibits the largest resistance. In situ XRD provides direct evidence for α-Ni(OH)₂ formation during extended cycling under alkaline conditions. These results demonstrate that different ALD coatings can selectively modulate surface kinetics and phase accessibility of nickel foam which can contribute to the design of nickel-based electrodes for phase-specific electrochemical applications.

研究了Al2O3和V2O5原子层沉积（ALD）对泡沫镍在碱性介质中电化学相演化的影响。采用循环伏安法（CV）、原位x射线衍射（XRD）、电化学阻抗谱（EIS）和Tafel分析对相变和表面动力学进行了表征。由于表面活化，裸NF在100 CV循环中α-Ni(OH)2的形成表现出正的阴极峰移。Al2O3包覆的NF （NF- a）表现出较大的位移（+90 mV），表明电荷转移动力学增强，能量势垒降低。相比之下，v2o5涂层的NF （NF- v）没有发生位移，表明表面动力学受到抑制。这些位移在更高的扫描速率下消失，表明这是一种动力学效应，而不是扩散诱导的行为。Tafel和EIS测量表明，NF-A的电荷转移电阻最小，而NF-V的电荷转移电阻最大。原位XRD提供了α-Ni(OH)2在碱性条件下延长循环生成的直接证据。这些结果表明，不同的ALD涂层可以选择性地调节泡沫镍的表面动力学和相可及性，这有助于设计用于相特异性电化学应用的镍基电极。

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引用次数: 0