Sub-1 nm Cu2O Nanosheets for the Electrochemical CO2 Reduction and Valence State–Activity Relationship

• DOI: 10.1021/jacs.3c08312
• Publication Date: 2023-11-17T23:14:35Z
• Authors: Ping Wang; Senyao Meng; Botao Zhang; Miao He; Pangen Li; Cheng Yang; Ge Li; Zhenxing Li
• Keywords: Oxidation state; Nanosheet

The copper-based (Cu-based) electrocatalytic materials effectively carry out the carbon dioxide reduction reaction (CO2RR) toward C2+ products, yet superiority and stability of oxidation state Cu are still worth studying. Herein, we designed prepared three Cu-based electrocatalysts with different states to study valence state-activity relationship. Among these electrocatalysts, Cu2O nanosheets thickness only 0.9 nm show an extremely high Faraday efficiency (FEC2+) ∼81%, FEC2+ has increase 37% compared traditional CuOx phase. ultrathin two-dimensional (2D) nanosheet structure abundant oxygen vacancies can stabilize improve selectivity for products in CO2RR. In situ Raman spectroscopy density functional theory calculations demonstrate that rich Cu+ 2D is most suitable *CO adsorption coverage on catalyst surface, which promotes C-C coupling This work provides excellent CO2RR products.