Impact of TiO2-II phase stabilized in anatase matrix by high-pressure torsion on electrocatalytic hydrogen production

Kaveh Edalati, Qing Wang, Hiroto Eguchi, Hadi Razavi-Khosroshahi, Hoda Emami, Miho Yamauchi, Masayoshi Fuji, Zenji Horita

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Electrocatalysis using renewable energy sources provides a clean technology to produce hydrogen from water. Titanium oxide is considered as a potential electrocatalyst not only for hydrogen production but also for CO2 conversion. In this study, to enhance the cathodic electrocatalytic activity of TiO2, the phase composition on TiO2 surface is modified by inclusion of high-pressure TiO2-II phase using high-pressure torsion (HPT) straining. Detailed spectroscopic studies revealed that the energy band gap is reduced and the valence band energy increased with increasing the TiO2-II fraction. The highest electrocatalytic activity for hydrogen production was achieved on an anatase-rich nanocomposite containing TiO2-II nanograins. IMPACT STATEMENT The first application of high-pressure TiO2-II phase for electrocatalysis confirm that the inclusion of phase in anatase-based nanocomposites is effective to enhance the electrocatalytic hydrogen production on titanium oxide due to the modification of electronic structure.

Original languageEnglish
Pages (from-to)334-339
Number of pages6
JournalMaterials Research Letters
Volume7
Issue number8
DOIs
Publication statusPublished - 2019
Externally publishedYes

Keywords

  • Electrocatalysis
  • Severe plastic deformation (SPD)
  • TiO2-II columbite phase
  • Titanium dioxide (TiO2)
  • Water splitting

ASJC Scopus subject areas

  • Materials Science(all)

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