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Surface Area-Enhanced Cerium and Sulfur-Modified Hierarchical Bismuth Oxide Nanosheets for Electrochemical Carbon Dioxide Reduction to Formate

Lookup NU author(s): Professor Eileen Yu

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Abstract

© 2024 Wiley-VCH GmbH. Electrochemical carbon dioxide reduction reaction (ECO2RR) is a promising approach to synthesize fuels and value-added chemical feedstocks while reducing atmospheric CO2 levels. Here, high surface area cerium and sulfur-doped hierarchical bismuth oxide nanosheets (Ce@S-Bi2O3) are develpoed by a solvothermal method. The resulting Ce@S-Bi2O3 electrocatalyst shows a maximum formate Faradaic efficiency (FE) of 92.5% and a current density of 42.09 mA cm−2 at −1.16 V versus RHE using a traditional H-cell system. Furthermore, using a three-chamber gas diffusion electrode (GDE) reactor, a maximum formate FE of 85% is achieved in a wide range of applied potentials (−0.86 to −1.36 V vs RHE) using Ce@S-Bi2O3. The density functional theory (DFT) results show that doping of Ce and S in Bi2O3 enhances formate production by weakening the OH* and H* species. Moreover, DFT calculations reveal that *OCHO is a dominant pathway on Ce@S-Bi2O3 that leads to efficient formate production. This study opens up new avenues for designing metal and element-doped electrocatalysts to improve the catalytic activity and selectivity for ECO2RR.

Publication metadata

Author(s): Palanimuthu N, Subramaniam MR, Muthu Austeria P, Sharma PK, Ramalingam V, Peramaiah K, Ramakrishnan S, Gu GH, Yu EH, Yoo DJ

Publication type: Article

Publication status: Published

Journal: Small

Year: 2024

Volume: 20

Issue: 40

Print publication date: 03/10/2024

Online publication date: 07/06/2024

Acceptance date: 10/05/2024

ISSN (print): 1613-6810

ISSN (electronic): 1613-6829

Publisher: John Wiley and Sons Inc.

URL: https://doi.org/10.1002/smll.202400913

DOI: 10.1002/smll.202400913

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