Visible-Light-Driven Photocatalytic Hydrogen Generation on Nanosized TiO2-II Stabilized by High-Pressure Torsion

Hadi Razavi-Khosroshahi, Kaveh Edalati, Masashige Hirayama, Hoda Emami, Makoto Arita, Miho Yamauchi, Hidehisa Hagiwara, Shintaro Ida, Tatsumi Ishihara, Etsuo Akiba, Zenji Horita, Masayoshi Fuji

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Photocatalytic activity of pure TiO2 is limited to ultraviolet (UV) light due to the wide bandgap of anatase and rutile phases. The bandgap of high-pressure phases of TiO2 can theoretically coincide with visible light, but these phases are unstable at ambient pressure. In this work, the high-pressure TiO2-II (columbite) phase with large fractions of oxygen vacancies was stabilized by inducing plastic strain to anatase under 6 GPa. The material could absorb visible light as a consequence of bandgap narrowing by â14 0.7 eV. Formation of nanosized TiO2-II enhanced the hydrogen generation efficiency under visible light, and the efficiency improved after removing the oxygen vacancies by annealing.

Original languageEnglish
Pages (from-to)5103-5107
Number of pages5
JournalACS Catalysis
Volume6
Issue number8
DOIs
Publication statusPublished - Aug 5 2016

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Fingerprint

Dive into the research topics of 'Visible-Light-Driven Photocatalytic Hydrogen Generation on Nanosized TiO<sub>2</sub>-II Stabilized by High-Pressure Torsion'. Together they form a unique fingerprint.

Cite this