Long-Term Continuous Conversion of CO2 to Formic Acid Using Boron-Doped Diamond Electrodes

Norihito Ikemiya, Keisuke Natsui, Kazuya Nakata, Yasuaki Einaga

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The long-term durability of boron-doped diamond electrodes (BDD) used continuously in the electrochemical conversion of CO2 to formic acid was investigated. Although the Faradaic efficiency (FE) for the production of formic acid decreased with increasing electrolysis time, the FE was easily recovered by electrochemical oxidation of the BDD electrodes in H2SO4, Na2SO4 or K2SO4 solutions. For practical application, the long-term production of formic acid using BDD electrodes can be successfully accomplished just by successive polarity reversal of plus and minus terminals. Furthermore, at a current density of -20 mA cm-2, the rate of production reached 328 μmol h-1 cm-2, which is the highest value ever obtained using plate electrodes. Consequently, we found that BDD electrodes are ideal for industrial application of CO2 reduction.

Original languageEnglish
Pages (from-to)8108-8112
Number of pages5
JournalACS Sustainable Chemistry and Engineering
Issue number7
Publication statusPublished - 2018 Jul 2


  • Boron-doped diamond
  • Carbon dioxide
  • Electrochemistry
  • Formic acid
  • Long-term conversion

ASJC Scopus subject areas

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


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