Cu–Ni alloy decorating N-doped carbon nanosheets toward high-performance electrocatalysis of mildly acidic CO2 reduction

• Published in: Inorganic chemistry frontiers 2023-04, Vol.10 (8), p.2276-2284
• Main Authors: Pan, Weifan, Wang, Peng, Fan, Linfeng, Chen, Kai, Luocai Yi, Huang, Junheng, Cai, Pingwei, Liu, Xi, Chen, Qingsong, Wang, Genxiang, Wen, Zhenhai
• Format: Article
• Language: English
• Subjects: Bimetals; Carbon; Carbon dioxide; Chemical reduction; Copper; Copper base alloys; Electrochemical analysis; Electrolysis; Electron transport; Industrial applications; Inorganic chemistry; Nanosheets; Nickel; Nitrogen; Self-assembly; Synergistic effect
• ISSN: 2052-1545; 2052-1553
• DOI: 10.1039/d3qi00207a

Electrochemical CO2 reduction to value-added chemicals or fuels is a prospective strategy for facilitating the closing of the carbon loop. However, there still exist challenges in developing efficient catalysts and optimizing the electrolyzer components to meet industrial applications. Herein, nitrogen-doped “willow leaf” shaped carbon nanosheets modified with Cu–Ni alloy (CuNi-N-CNS) is designed for electrochemical CO2 reduction reaction (CO2RR), which shows high faradaic efficiency for CO of over 90% at a wide potential window ranging from −0.8 V to −1.0 V and robust durability with almost 100% of its initial selectivity after 36 h of electrolysis in H-type cell. Moreover, we evaluate its electrocatalytic activity in a self-assembly flow cell in a mildly acidic catholyte (CO2-saturated 3 M KCl solution, pH = 4.25), which can achieve a commercially viable current density of 420 mA cm−2 at −1.0 V versus reversible hydrogen electrode (vs. RHE) with CO selectivity above 95%. Experimental characterization and electrochemical analysis reveal that the synergistic effects of ultra-thin “willow leaf” structure and bimetallic alloy modification can not only increase electron transport efficiency but also decrease the reaction energy barrier of COOH* and promote the formation of CO.