Super‐Coordinated Nickel N<sub>4</sub>Ni<sub>1</sub>O<sub>2</sub>Site Single‐Atom Catalyst for Selective H<sub>2</sub>O<sub>2</sub>Electrosynthesis at High Current Densities
Chuqian Xiao, Ling Cheng, Yihua Zhu, Gengchao Wang, Luyang Chen, Yating Wang, Rongzhen Chen, Yuhang Li, Chunzhong Li
Abstract
Abstract Electrochemical production of hydrogen peroxide (H 2 O 2 ) from O 2 on single‐atom catalysts has attracted great attention, yet the quest for robust catalysts is driven by achieving >90 % Faradaic efficiency (FE) under industrial‐relevant current densities (>100 mA cm −2 ). Herein we synthesize a catalyst that contains single nickel site coordinated by four nitrogen and two oxygen atoms (i.e., N 4 Ni 1 O 2 ) via involving carboxyl functionalized multiwall carbon nanotubes as a substrate to provide extra O coordination to the regular NiN 4 site. It has a cathodic energy efficiency of approximately 82 % and a H 2 O 2 FE of around 96 % at 200 mA cm −2 current density, outperforming the reported single‐atom catalysts for H 2 O 2 electrosynthesis.