Boosting alkaline hydrogen evolution via spontaneous built-in electric field

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-07-05 DOI:10.1007/s12598-024-02859-7

Ze-Peng Lv, Da-He Zhang, Meng-Lu Zang, Shao-Long Li, Ji-Lin He, Jian-Xun Song

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Abstract

The electrochemical reaction rate strongly depends on the pH of the solution and the relatively sluggish alkaline hydrogen evolution reaction (HER) process, attributed to alterations in the type of proton donor and binding energy, has consistently presented a significant challenge. Here, we report a new method for boosting alkaline HER via spontaneous built-in electric field strategy employed on cobalt phosphide nanofibers (NFs) electrocatalyst. The anion–cation dual-introduction of V and N on the NFs not only increases the electrochemical surface area but also enhances the catalytic activity, thereby elevating the performance of alkaline HER. An investigation strategy combining experiments and calculations revealed the charge transfer law between multiple active components and the enhanced regulation mechanism of alkaline HER process, ultimately achieving a nearly twice increase in reaction overpotential of the as-fabricated catalyst at − 10 mA·cm⁻². This new approach provides a potential strategy for improving the efficiency of core catalyst for energy conversion technologies.

Graphical Abstract

Abstract Image

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通过自发内置电场促进碱性氢进化

电化学反应速率在很大程度上取决于溶液的 pH 值，而由于质子供体类型和结合能的改变，碱性氢进化反应（HER）过程相对缓慢，这一直是一个重大挑战。在此，我们报告了一种在磷化钴纳米纤维（NFs）电催化剂上采用自发内置电场策略促进碱性氢进化反应的新方法。阴阳离子在 NFs 上的双重引入不仅增加了电化学表面积，还增强了催化活性，从而提高了碱性 HER 的性能。实验与计算相结合的研究策略揭示了多种活性成分之间的电荷转移规律和碱性 HER 过程的增强调节机制，最终实现了在 - 10 mA-cm-2 条件下反应过电位比原样制造的催化剂提高近两倍。这种新方法为提高能源转换技术核心催化剂的效率提供了一种潜在的策略。

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

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.