Coordinating the Edge Defects of Bismuth with Sulfur for Enhanced CO2 Electroreduction to Formate.
Angew Chem Int Ed Engl
; 62(25): e202303117, 2023 Jun 19.
Article
em En
| MEDLINE
| ID: mdl-37078760
ABSTRACT
Bismuth-based materials have been recognized as promising catalysts for the electrocatalytic CO2 reduction reaction (ECO2 RR). However, they show poor selectivity due to competing hydrogen evolution reaction (HER). In this study, we have developed an edge defect modulation strategy for Bi by coordinating the edge defects of bismuth (Bi) with sulfur, to promote ECO2 RR selectivity and inhibit the competing HER. The prepared catalysts demonstrate excellent product selectivity, with a high HCOO- Faraday efficiency of ≈95 % and an HCOO- partial current of ≈250â
mA cm-2 under alkaline electrolytes. Density function theory calculations reveal that sulfur tends to bind to the Bi edge defects, reducing the coordination-unsaturated Bi sites (*H adsorption sites), and regulating the charge states of neighboring Bi sites to improve *OCHO adsorption. This work deepens our understanding of ECO2 RR mechanism on bismuth-based catalysts, guiding for the design of advanced ECO2 RR catalysts.
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Base de dados:
MEDLINE
Assunto principal:
Bismuto
/
Dióxido de Carbono
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article