Modulating Built‐In Electric Field via Variable Oxygen Affinity for Robust Hydrogen Evolution Reaction in Neutral Media

作者：Ling-Ling Zhai, Xiaojie She, Lyuchao Zhuang, Yanyong Li, Ran Ding, Xuyun Guo, Yongqi Zhang, Ye Zhu, Kun Xu, Hong Jin Fan, Shu Ping Lau · 发表于：Angewandte Chemie International Edition · 年份：2022 · DOI：10.1002/anie.202116057 · 被引用次数：344 · 研究领域：Electrocatalysts for Energy Conversion、Advanced battery technologies research、Advanced Photocatalysis Techniques

Abstract Work function strongly impacts the surficial charge distribution, especially for metal‐support electrocatalysts when a built‐in electric field (BEF) is constructed. Therefore, studying the correlation between work function and BEF is crucial for understanding the intrinsic reaction mechanism. Herein, we present a Pt@CoOx electrocatalyst with a large work function difference (ΔΦ) and strong BEF, which shows outstanding hydrogen evolution activity in a neutral medium with a 4.5‐fold mass activity higher than 20 % Pt/C. Both experimental and theoretical results confirm the interfacial charge redistribution induced by the strong BEF, thus subtly optimizing hydrogen and hydroxide adsorption energy. This work not only provides fresh insights into the neutral hydrogen evolution mechanism but also proposes new design principles toward efficient electrocatalysts for hydrogen production in a neutral medium.