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

Mai Tomisaki, Keisuke Natsui, Satoko Fujioka, Koichi Terasaka, Yasuaki Einaga

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Article number138769
JournalElectrochimica Acta
Volume389
DOIs
Publication statusPublished - 2021 Sep 1

Keywords

  • Boron-doped diamond
  • Electrochemical CO reduction
  • Fine bubbles
  • Infrared spectroscopy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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