Visible-light photocatalytic oxygen production on a high-entropy oxide by multiple-heterojunction introduction

Parisa Edalati, Yuta Itagoe, Hironori Ishihara, Tatsumi Ishihara, Hoda Emami, Makoto Arita, Masayoshi Fuji, Kaveh Edalati

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10 Citations (Scopus)


High-entropy oxides (HEOs), as multi-component ceramics with high configurational entropy, have been of recent interest due to their attractive properties including photocatalytic activity for H2 production and CO2 conversion. However, the photocatalytic activity of HEOs is still limited to ultraviolet light. In this study, to achieve visible-light-driven photocatalysis, 10 different heterojunctions were simultaneously introduced in the Ti-Zr-Nb-Ta-W-O system. The oxide, which was synthesized by a high-pressure torsion method and oxidation, successfully produced oxygen from water under visible light without co-catalyst addition. The photocatalytic performance was attributed to high visible-light absorption, low bandgap, appropriate band structure, presence of multiple heterojunctions and accordingly easy electron-hole separation and slow recombination. These results not only show the potential of high-entropy oxides as new visible-light-active photocatalysts, but also introduce the multiple-heterojunction introduction as a strategy to achieve photocatalysis under visible light.

Original languageEnglish
Article number114167
JournalJournal of Photochemistry and Photobiology A: Chemistry
Publication statusPublished - Dec 1 2022

All Science Journal Classification (ASJC) codes

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


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