Effect of doping level on the electrochemical reduction of CO2 on boron-doped diamond electrodes

Jing Xu, Keisuke Natsui, Shuhei Naoi, Kazuya Nakata, Yasuaki Einaga

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Boron-doped diamond (BDD) electrodes have been applied on the electrochemical reduction of CO2. Although boron doping level can strongly affect the electrochemical properties of BDD electrodes, there are, so far, no reports about the effect of doping level on the electrochemical reduction of CO2 using BDD electrodes. Here, we investigated the relationship between boron content of BDD electrodes and the products of CO2 reduction. We prepared five kinds of BDD electrodes with various boron contents (0.01%, 0.1%, 0.5%, 1%, and 2%). The highest faradaic efficiency for producing formic acid was achieved by using a BDD electrode with the boron content of 0.1%, and the faradaic efficiency for hydrogen evolution increased with increasing boron content due to narrower potential window of BDD with higher boron content. On the other hand, the faradaic efficiency for producing CO, which was a side product, slightly increased with increasing boron content. This trend suggested that the adsorbability of CO2 and its intermediates could be altered by controlling boron content. The research opens new insights for design and control of boron-doped diamond for the electrochemical reduction of CO2.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalDiamond and Related Materials
Volume86
DOIs
Publication statusPublished - 2018 Jun 1

Keywords

  • Boron content
  • Boron-doped diamond
  • Carbon monoxide
  • CO reduction
  • Formic acid

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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