The Role of Phase Mixing Degree in Promoting C−C Coupling in Electrochemical CO <sub>2</sub> Reduction Reaction on Cu‐based Catalysts
Yinuo Wang, Fei Yang, Hongming Xu, Juhee Jang, Ernest Pahuyo Delmo, Xiaoyi Qiu, Zhehan Ying, Ping Gao, Shangqian Zhu, Meng Gu, Minhua Shao
Abstract
reduction reaction. Defect engineering in catalysts is a widely employed strategy for promoting C-C coupling on Cu. However, comprehensive understanding of defect structure-to-activity relationship has not been obtained. In this study, controllable defects generation is achieved, which leads to a series of Cu-based catalysts with various phase mixing degrees. It is observed that the Faradaic efficiency toward C2+ products increases with the phase mixing degree, reaching 81 % at maximum. In situ infrared absorption spectroscopy reveals that the catalysts with higher phase mixing degree tend to form *CO more easily and possess higher retention of *CO under high overpotential window, thereby promoting C-C coupling. This work sheds new light on the relationship between defects and C-C coupling, and the rational developed of more advanced Cu-base catalysts.