Photo-induced CO2 reduction with GaN electrode in aqueous system

Satoshi Yotsuhashi*, Masahiro Deguchi, Yuji Zenitani, Reiko Hinogami, Hiroshi Hashiba, Yuka Yamada, Kazuhiro Ohkawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


CO2 reduction with water and light illumination is realized using a gallium nitride (GaN) photoelectrode in which excited electrons induce CO2 conversion at the counter electrode. For the counter electrode, a copper (Cu) plate was chosen. The low affinity and wide gap of the nitride semiconductor enable us to create an electron-hole pair which has a sufficient energy for both CO2 reduction and water oxidation, in spite of the fact that a high energy for CO2 reduction is required. Within this system, the generation of formic acid (HCOOH) with 3% Faradic efficiency was confirmed by light illumination alone.

Original languageEnglish (US)
Article number117101
Issue number11
StatePublished - Nov 2011
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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