Switchable Product Selectivity in the Electrochemical Reduction of Carbon Dioxide Using Boron-Doped Diamond Electrodes

Mai Tomisaki, Seiji Kasahara, Keisuke Natsui, Norihito Ikemiya, Yasuaki Einaga

Research output: Contribution to journalArticle

Abstract

The main product obtained by electrochemical reduction of CO 2 depends on the electrode material, and in many cases the Faradaic efficiency for this is determined by the electrolyte. Only a few investigations in which attempts to produce different products from the same electrode material have been done so far. In this work, we focus on boron-doped diamond (BDD) electrodes with which plentiful amounts of formic acid and small amounts of carbon monoxide have been produced. By optimizing certain parameters and conditions used in the electrochemical process with BDD electrodes, such as the electrolyte, the boron concentration of the BDD electrode, and the applied potential, we were able to control the selectivity and efficiency with which carbon monoxide is produced. On one hand, with a BDD electrode with 1% boron used for the cathode and KClO 4 for the catholyte, the selectivity for producing carbon monoxide was high. On the other hand, with a BDD electrode with 0.1% boron used for the cathode and KCl for the catholyte, the production of formic acid was the most evident. In situ attenuated total reflectance-infrared (ATR-IR) measurements during electrolysis showed that CO 2 ·- intermediates were adsorbed on the BDD surface in the KClO 4 aqueous solution. Here, switchable product selectivity was achieved when reducing CO 2 using BDD electrodes.

Original languageEnglish
Pages (from-to)7414-7420
Number of pages7
JournalJournal of the American Chemical Society
Volume141
Issue number18
DOIs
Publication statusPublished - 2019 Apr 15

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Diamond
Boron
Carbon Dioxide
Diamonds
Carbon dioxide
Electrodes
Carbon Monoxide
formic acid
Carbon monoxide
Formic acid
Electrolytes
Cathodes
Electrolysis
Infrared radiation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Switchable Product Selectivity in the Electrochemical Reduction of Carbon Dioxide Using Boron-Doped Diamond Electrodes. / Tomisaki, Mai; Kasahara, Seiji; Natsui, Keisuke; Ikemiya, Norihito; Einaga, Yasuaki.

In: Journal of the American Chemical Society, Vol. 141, No. 18, 15.04.2019, p. 7414-7420.

Research output: Contribution to journalArticle

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