Highly Efficient CO<sub>2</sub> Reduction at Steady 2 A cm<sup>−2</sup> by Surface Reconstruction of Silver Penetration Electrode
Shoujie Li, Xiao Dong, Jianing Mao, Wei Chen, Aohui Chen, Gangfeng Wu, Chang Zhu, Guihua Li, Yiheng Wei, Xiaohu Liu, Jiangjiang Wang, Yanfang Song, Wei Wei
Abstract
Abstract Electroreduction of CO 2 to CO is a promising route for greenhouse gas resource utilization, but it still suffers from impractical current density and poor durability. Here, a nanosheet shell (NS) vertically standing on the Ag hollow fiber (NS@Ag HF) surface formed by electrochemical surface reconstruction is reported. As‐prepared NS@Ag HF as a gas penetration electrode exhibited a high CO faradaic efficiency of 97% at an ultra‐high current density of 2.0 A cm −2 with a sustained performance for continuous >200 h operation. The experimental and theoretical studies reveal that promoted surface electronic structures of NS@Ag HF by the nanosheets not only suppress the competitive hydrogen evolution reaction but also facilitate the CO 2 reduction kinetics. This work provides a feasible strategy for fabricating robust catalysts for highly efficient and stable CO 2 reduction.