Ampere‐Level Current Density CO<sub>2</sub> Reduction with High C<sub>2+</sub> Selectivity on La(OH)<sub>3</sub>‐Modified Cu Catalysts
Shuqi Hu, Yumo Chen, Zhiyuan Zhang, Shaohai Li, Heming Liu, Xin Kang, Jiarong Liu, Shiyu Ge, Jingwei Wang, Wei Lv, Zhiyuan Zeng, Xiaolong Zou, Qiangmin Yu, Bilu Liu
Abstract
Abstract The carbon dioxide reduction reaction (CO 2 RR) driven by electricity can transform CO 2 into high‐value multi‐carbon (C 2+ ) products. Copper (Cu)‐based catalysts are efficient but suffer from low C 2+ selectivity at high current densities. Here La(OH) 3 in Cu catalyst is introduced to modify its electronic structure towards efficient CO 2 RR to C 2+ products at ampere‐level current densities. The La(OH) 3 /Cu catalyst has a remarkable C 2+ Faradaic efficiency (FE C2+ ) of 71.2% which is 2.2 times that of the pure Cu catalyst at a current density of 1,000 mA cm −2 and keeps stable for 8 h. In situ spectroscopy and density functional theory calculations both show that La(OH) 3 modifies the electronic structure of Cu. This modification favors *CO adsorption, subsequent hydrogenation, *CO─*COH coupling, and consequently increases C 2+ selectivity. This work provides a guidance on facilitating C 2+ product formation, and suppressing hydrogen evolution by La(OH) 3 modification, enabling efficient CO 2 RR at ampere‐level current densities.