Chloride Ion Adsorption Enables Ampere‐Level CO<sub>2</sub> Electroreduction over Silver Hollow Fiber
Shoujie Li, Xiao Dong, Yonghui Zhao, Jianing Mao, Wei Chen, Aohui Chen, Yanfang Song, Guihua Li, Zheng Jiang, Wei Wei, Yuhan Sun
Abstract
Abstract Electrochemical conversion of CO 2 into valuable feedstocks is a promising strategy for carbon neutrality. However, it remains a challenge to possess a large current density, a high faradaic efficiency and excellent stability for practical applications of CO 2 utilization. Herein, we report a facile tactic that enables exceedingly efficient CO 2 electroreduction to CO by virtue of low‐coordination chloride ion (Cl − ) adsorption on a silver hollow fiber (Ag HF) electrode. A CO faradaic efficiency of 92.3 % at a current density of one ampere per square centimeter (1 A cm −2 ) in 3.0 M KCl with a sustained performance observed during a 150‐hour test was achieved, which is better than state‐of‐the‐art electrocatalysts. The electrochemical results and density functional theory (DFT) calculations suggested a low‐coordination Cl − adsorption on surface of Ag HF, which not only suppressed the competitive hydrogen evolution reaction (HER), but also facilitated the CO 2 reduction kinetics.