Electrochemically Reconstructed Cu‐FeOOH/Fe 3 O 4 Catalyst for Efficient Hydrogen Evolution in Alkaline Media

作者：Chenfan Yang, Wenda Zhong, Ke Shen, Qin Zhang, Rong Zhao, Hui Xiang, Jing Wu, Xuanke Li, Nianjun Yang · 发表于：Advanced Energy Materials · 年份：2022 · DOI：10.1002/aenm.202200077 · 被引用次数：165 · 研究领域：Electrocatalysts for Energy Conversion、Advanced battery technologies research、Copper-based nanomaterials and applications

Abstract Surface self‐reconstruction via incorporating an amorphous structure on the surface of a catalyst can induce abundant defects and unsaturated sites for enhanced hydrogen evolution reaction (HER) activity. Herein, an electrochemical activation method is proposed to reconstruct the surface of a Cu‐Fe 3 O 4 catalyst. Following a “dissolution–redeposition” path, the defective FeOOH is formed under potential stimulation on the surface of the Cu‐Fe 3 O 4 precursor during the electrochemical activation process. This Cu‐FeOOH/Fe 3 O 4 catalyst exhibits excellent stability as well as extremely low overpotential toward the alkaline HER (e.g., 129 and 285 mV at the large current densities of − 100 and 500 mA cm −2 , respectively), much superior to the Pt/C catalyst. The experimental and density functional theory calculation results demonstrate that the Cu‐FeOOH/Fe 3 O 4 catalyst has abundant oxygen vacancies, featuring optimized surface chemical composition and electronic structure for improving the active sites and intrinsic activity. Introducing defective FeOOH on the surface of a Cu‐Fe 3 O 4 catalyst by means of an electrochemical activation method decreases the energy barrier of both H 2 O dissociation and H 2 generation. Such a surface self‐reconstruction strategy provides a new avenue toward the production of efficient non‐noble metal catalysts for the HER.