β-Ga2O3 single crystal as a photoelectrode for water splitting

Takayoshi Oshima, Kenichi Kaminaga, Hisanori Mashiko, Akira Mukai, Kohei Sasaki, Takekazu Masui, Akito Kuramata, Shigenobu Yamakoshi, Akira Ohtomo

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

We report the photoelectrode properties of an n-type β-Ga 2O3 single crystal in aqueous solutions. The conduction and valence band-edge potentials were found to be 1.1 V higher and 2.5 V lower than the H+/H2 and O2/H2O redox potentials, respectively. Photocurrent drastically increased as photogenerated carriers were excited at a photon energy higher than the fundamental absorption edge of 4.7 eV. The incident photon-to-current conversion efficiency was 36% at 5.2 eV. Gaseous oxygen and hydrogen evolved from the photoelectrode and Pt counter electrode, respectively. The stoichiometric water splitting was demonstrated by applying an external bias of 1 V.

Original languageEnglish
Article number111102
JournalJapanese journal of applied physics
Volume52
Issue number11 PART 1
DOIs
Publication statusPublished - 2013 Nov 1
Externally publishedYes

ASJC Scopus subject areas

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

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