Cobalt Aluminate Spinel as a Cocatalyst for Photocatalytic Oxidation of Water: Significant Hole-Trapping Effect

Tomoki Kanazawa, Kosaku Kato, Ryusei Yamaguchi, Tomoki Uchiyama, Daling Lu, Shunsuke Nozawa, Akira Yamakata, Yoshiharu Uchimoto, Kazuhiko Maeda

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

Here we show that nanoparticulate CoAl2O4 spinel serves as an efficient cocatalyst for photocatalytic oxidation of water. The O2 evolution activity of CoAl2O4/g-C3N4 from an aqueous solution of AgNO3 under visible light irradiation was ∼10 times that of unmodified g-C3N4 and also exceeded that of an analogue modified with a well-known Co3O4 cocatalyst for each optimal preparation condition. Transient absorption spectroscopy indicated that the CoAl2O4 cocatalyst with Co2+ as the main cobalt species at the A site of the spinel possessed better hole-capturing properties than the Co3O4 cocatalyst, which was the main reason for the improved water-oxidation performance.

Original languageEnglish
Pages (from-to)4960-4966
Number of pages7
JournalACS Catalysis
Volume10
Issue number9
DOIs
Publication statusPublished - May 1 2020
Externally publishedYes

Keywords

  • artificial photosynthesis
  • mixed anion compounds
  • solar fuels
  • visible light
  • water splitting

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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