Promotion of CO 2 Electroreduction on Bismuth Nanosheets with Cerium Oxide nanoparticles.

Authors :: Guan Y
Wu SQ
Huang HZ
Zhu Z
Tian W
Yin AX
Source :: Chemistry, an Asian journal [Chem Asian J] 2024 Sep 02; Vol. 19 (17), pp. e202400296. Date of Electronic Publication: 2024 Aug 05.
Publication Year :: 2024
Abstract: Formic acid (HCOOH) is a highly energy efficient product of the electrochemical CO <subscript>2</subscript> reduction reaction (CO <subscript>2</subscript> RR). Bismuth-based catalysts have shown promise in the conversion of CO <subscript>2</subscript> to formic acid, but there is still a great need for further improvement in selectivity and activity. Herein, we report the preparation of Bi nanosheets decorated by cerium oxide nanoparticles (CeO <subscript>x</subscript> ) with high Ce <superscript>3+</superscript> /Ce <superscript>4+</superscript> ratio and rich oxygen vacancies. The CeO <subscript>x</subscript> nanoparticles affect the electronic structures of bismuth, enhance CO <subscript>2</subscript> adsorption, and thus promote the CO <subscript>2</subscript> RR properties of Bi nanosheets. Compared with elemental Bi nanosheets, the hetero-structured CeO <subscript>x</subscript> /Bi nanosheets exhibit much higher activity over a wide potential window, showing a current density of 16.1 mA cm <superscript>-2</superscript> with a Faradaic efficiency of 91.1% at -0.9 V vs. reversible hydrogen electrode.<br /> (© 2024 Wiley-VCH GmbH.)

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