Adjusting the Ratio of Oxidation States in a CuO@Cu 2 O for the Optimization of Electrocatalytic CO 2 Conversion to Ethylene

作者：Jun Lü, Yanhan Ren, Liang Wang, Lie Zou, Jing Liang, Xiaolong Liang, Yan Gao, Fei Li, Junfeng Gao, Junfeng Gao, Andreas Terfort, Jinxuan Liu · 发表于：ChemSusChem · 年份：2025 · DOI：10.1002/cssc.202401963 · 被引用次数：10 · 研究领域：CO2 Reduction Techniques and Catalysts、Electrocatalysts for Energy Conversion、Electrochemical Analysis and Applications

Abstract Understanding the impact of surface copper valence states on the distribution of electrochemical carbon dioxide products is critical. Herein, CuO@Cu 2 O with a Cu 2+ /Cu + interface was fabricated using wet chemical etching approach. The hollow shape offered a large region for gas adsorption, while the interfacial mixed chemical state of Cu 2+ /Cu + with tunable control ratio raised the local density of CHO* and accelerated the carbon‐carbon coupling reaction. The H‐cell test results demonstrate that, as result of this precise structural design, the Faraday efficiency of ethylene is enhanced from 15.2 % to 43.5 %, and the service life is increased 4 times. In addition, its selectivity is almost 50 % and its partial current density in MEA is 93.2 mA cm −2 . In situ Raman and DFT data demonstrate that the Cu 2+ /Cu + interface effect enhances the concentration of COCHO intermediates and lowers the energy barrier for the conversion of CO* to COCHO* intermediates.