Interfacial-Free-Water-Enhanced Mass Transfer to Boost Current Density of Hydrogen Evolution

IF 9.6 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-04-14 DOI:10.1021/acs.nanolett.5c0123510.1021/acs.nanolett.5c01235

Xian He, Bohan Deng, Jialiang Lang, Zhichuan Zheng, Zhuting Zhang, Hsiangshun Chang, Yufeng Wu, Chong Yang, Wei Zhao, Ming Lei, Hongyi Liu, Kai Huang* and Hui Wu*,

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Abstract

The advancement of water electrolysis highlights the growing importance of electrolyzers capable of operating at high current densities, where mass transfer dynamics plays a crucial role. In the electrode reactions, the interfacial water is a key factor in regulating these dynamics. However, the potential of utilizing interfacial-free water (IFW) to modulate electrode behavior remains underexplored. Herein, we investigate the effect of interfacial water structure on hydrogen evolution reaction (HER) performance across different current density ranges, using designed platinum-coated nickel hydroxide on nickel foam (Pt@Ni(OH)₂-NF) electrodes. We reveal that with increasing current density, changes in interfacial water structure alter the rate-determining step of the HER. Pt@Ni(OH)₂-NF exhibited excellent performance in alkaline electrolytes, achieving 1000 mA cm^–2 at 114 mV overpotential. This study provides a novel approach to optimizing alkaline water electrolysis dynamics by enhancing mass transfer, further paving the way for more efficient and energy-saving hydrogen production.

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界面无水增强传质以提高析氢电流密度

水电解的进步凸显了能够在高电流密度下运行的电解槽的重要性，其中传质动力学起着至关重要的作用。在电极反应中，界面水是调节这些动力学的关键因素。然而，利用无界面水（IFW）调节电极行为的潜力仍未得到充分探索。在此，我们研究了界面水结构对析氢反应（HER）性能的影响，在不同的电流密度范围内，使用设计的铂包覆氢氧化镍泡沫镍（Pt@Ni(OH)2-NF）电极。我们发现，随着电流密度的增加，界面水结构的变化改变了HER的速率决定步骤。Pt@Ni(OH)2-NF在碱性电解质中表现优异，在114 mV过电位下可达到1000 mA cm-2。本研究为通过提高传质来优化碱水电解动力学提供了一种新的途径，进一步为高效节能制氢铺平了道路。

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.