Anchoring Ionic Liquid in Copper Electrocatalyst for Improving CO<sub>2</sub> Conversion to Ethylene
Yufei Sha, Jianling Zhang, Xiuyan Cheng, Mingzhao Xu, Zhuizhui Su, Yanyue Wang, Jingyang Hu, Buxing Han, Lirong Zheng
Abstract
Abstract Electrochemical conversion of CO 2 to valuable fuels is appealing for CO 2 fixation and energy storage. The Cu‐based catalysts feature unique superiorities, but achieving high ethylene selectivity is still restricted. In this study, we propose the anchoring of an ionic liquid (IL) on a Cu electrocatalyst for improving the electrochemical CO 2 reduction to ethylene. In a water‐based electrolyte and a commonly used H‐type cell, a high ethylene Faradaic efficiency of 77.3 % was achieved at −1.49 V (vs. RHE). Experimental and theoretical studies reveal that an IL can modify the electronic structure of a Cu catalyst through its interaction with Cu, making it more conducive to *CO dimerization for ethylene formation.