External electric field modulation of cation-induced interfacial potential during hydrogen evolution on polycrystalline platinum surfaces

IF 9.4 1区化学 Q1 CHEMISTRY, PHYSICAL

Journal of Colloid and Interface Science Pub Date : 2025-06-20 DOI:10.1016/j.jcis.2025.138259

Pengbo Ding , Qitao Lian , Dan Xing , Lixiu Guan , Zhuoao Li , Shuo Zhang , Junguang Tao

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Abstract

The impact of alkaline media on the hydrogen evolution reaction (HER) rate is crucial for water electrolysis. This study provides new insights into how alkali metal cations (AM⁺) influence the HER performance of Pt electrodes. We quantified interfacial potential drops modulated by an external electric field and discovered that the local surface concentration of AM⁺ is 5.0 to 8.6 times higher than in the bulk solution. The accumulation of AM⁺ in the outer Helmholtz plane (OHP) diminishes the interaction between H₂O and Pt surface, thereby impeding H₂O dissociation. The external electric field drives AM⁺ away from the OHP, mitigating this effect. Theoretical calculations indicate that AM⁺ enhance proton transfer by reorganizing interfacial water, with Li⁺ orienting surrounding OH bonds favorably towards the Pt surface, thus facilitating the HER process. Our combined experimental and theoretical studies elucidate the role of AM⁺ in the HER by influencing double-layer potential and interfacial water formation.

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多晶铂表面析氢过程中阳离子诱导界面电位的外电场调制

碱性介质对析氢反应（HER）速率的影响是电解水的关键。这项研究为碱金属阳离子（AM+）如何影响Pt电极的HER性能提供了新的见解。我们量化了外电场调制的界面电位下降，发现AM+的局部表面浓度比本体溶液高5.0 ~ 8.6倍。AM+在外亥姆霍兹平面（OHP）的积累减少了H2O与Pt表面的相互作用，从而阻碍了H2O的解离。外部电场驱动AM+远离OHP，减轻了这种影响。理论计算表明，AM+通过重组界面水来增强质子转移，Li+使周围的OH键向Pt表面倾斜，从而促进了HER过程。我们的实验和理论结合研究阐明了AM+通过影响双层电位和界面水形成在HER中的作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Colloid and Interface Science 化学-物理化学

CiteScore

16.10

自引率

7.10%

发文量

2568

审稿时长

2 months

期刊介绍： The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality. Emphasis: The journal emphasizes fundamental scientific innovation within the following categories: A.Colloidal Materials and Nanomaterials B.Soft Colloidal and Self-Assembly Systems C.Adsorption, Catalysis, and Electrochemistry D.Interfacial Processes, Capillarity, and Wetting E.Biomaterials and Nanomedicine F.Energy Conversion and Storage, and Environmental Technologies