Unique properties of fine bubbles in the electrochemical reduction of carbon dioxide using boron-doped diamond electrodes

The electrochemical CO2 reduction on boron-doped diamond (BDD) electrodes in an aqueous solution with fine bubbles was studied. The overpotential decreased and the production of carbon monoxide was promoted in the CO2 reduction with fine bubbles compared to that without fine bubbles. It is suggested...

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Bibliographic Details
Published in:Electrochimica acta 2021-09, Vol.389, p.138769, Article 138769
Main Authors: Tomisaki, Mai, Natsui, Keisuke, Fujioka, Satoko, Terasaka, Koichi, Einaga, Yasuaki
Format: Article
Language:English
Subjects:
Aqueous solutions
Boron
Boron-doped diamond
Bubbles
Carbon dioxide
Carbon monoxide
Catalytic activity
Chemical reduction
Diamonds
Electrochemical CO2 reduction
Fine bubbles
Infrared spectroscopy
Mass transport
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Summary:The electrochemical CO2 reduction on boron-doped diamond (BDD) electrodes in an aqueous solution with fine bubbles was studied. The overpotential decreased and the production of carbon monoxide was promoted in the CO2 reduction with fine bubbles compared to that without fine bubbles. It is suggested that fine bubbles in solution could facilitate the mass transport and also act as the catalyst for producing carbon monoxide. Potential-dependent in-situ attenuated total reflectance-infrared (ATR-IR) measurements confirmed the catalytic activity, showing that in solutions with CO2 fine bubbles the CO2•– intermediate or the CO2 molecules themselves become stabilized near the electrode and these can be adsorbed on the electrode surface more easily compared to using solutions without CO2 fine bubbles. The reported work is a first step in understanding the effects of fine bubbles in CO2 reduction reactions.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2021.138769