Activation of Boron-Doped Diamond Electrodes for Electrochemical CO2Reduction in a Halogen-free Electrolyte

Atsushi Otake, Jinglun Du, Yasuaki Einaga

Research output: Contribution to journalArticlepeer-review

Abstract

The electrochemical reduction of carbon dioxide (CO2) has been attracting great interest in these days. In particular, the electrochemical production of formic acid from carbon dioxide in a halogen-free electrolyte is practically important for recently developed applications such as hydrogen carriers and fuel cells. In the present work, we have demonstrated highly selective electrochemical CO2 reduction in a halogen-free electrolyte by an "activation"process which involves an initial electrochemical CO2 reduction reaction at a boron-doped diamond (BDD) electrode. The BDD activation increased the Faradaic efficiency of formic acid from 10 to 90%. A mechanistic study on the BDD activation is presented, which can explain the drastic change of reaction selectivity from the perspective of reducing the energy of electron transfer from the BDD electrode and the mass transport of CO2 molecules to the electrode surface.

Original languageEnglish
Pages (from-to)14445-14450
Number of pages6
JournalACS Sustainable Chemistry and Engineering
Volume10
Issue number44
DOIs
Publication statusPublished - 2022 Nov 7

Keywords

  • boron-doped diamond
  • carbon dioxide
  • electrochemistry
  • formic acid

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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