Enhanced Electroconversion CO2‐to‐Formate by Oxygen‐Vacancy‐Rich Ultrasmall Bi‐Based Catalyst Over a Wide Potential Window. Issue 6 (24th January 2022)

• Record Type: Journal Article
• Authors: Wang, Xueli; Zhang, Lu‐Hua; Chen, Datong; Zhan, Jiayu; Guo, Jiangyi; Zhang, Zisheng; Yu, Fengshou
• Is Part Of: ChemCatChem. Volume 14:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-01-24
• Subjects: Bi-based catalysts -- electrochemical CO2 reduction -- formate -- oxygen vacancy -- wide potential window; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202101873
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Bi‐based materials quickly rise as promising candidates for electrochemical CO2 ‐to‐formate conversion. However, most of them only display a narrow potential range for the desired formate selectivity. Herein, we designed an oxygen‐vacancy‐rich ultrasmall bismuth subcarbonate supported on reduced graphene oxide composite (Vo‐BOC/G) for electrochemical CO2 ‐to‐formate conversion. The Vo‐BOC/G exhibits an outstanding formate selectivity up to 100 % at −1.2 V vs. RHE and an impressive partial current density of 38 mA cm −2 in 0.1 M KHCO3 . More importantly, the considerable formate selectivity (>80 %) was obtained over an impressively wide potential range of 600 mV, superior over most of reported Bi‐based electrocatalysts under the same conditions. Theoretical results show the abundant Vo defects significantly lower energy barrier for *CO2 formation, resulting in high formate selectivity over a wider potential window. This work may pave the way for Bi‐based materials application in different renewable energy‐conversion devices. Abstract : Oxygen vacancies : This work is about the development of Bi‐based catalysts for CO2 RR. The ultrasmall Vo‐BOC has abundant oxygen vacancies and contributes to improve the catalytic activity and stability of CO2 RR. The proposed electrocatalyst can achieve 100 % formate selectivity at −1.2 V and a formate selectivity of over 80 % in the potential range of 600 mV.