Visible-light photocatalytic oxygen production on a high-entropy oxide by multiple-heterojunction introduction
arXiv:2301.05016 · doi:10.1016/j.jphotochem.2022.114167
Abstract
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, narrow 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.
References in corpus (2)
Cited by in corpus (8)
- Severe Plastic Deformation of Ceramics by High-Pressure Torsion: Review of Principles and Applications
- Superfunctional high-entropy alloys and ceramics by severe plastic deformation
- Understanding high photocatalytic activity of the TiO2 high-pressure columbite phase by experiments and first-principles calculations
- Superfunctional materials by ultra-severe plastic deformation
- High-entropy perovskites as new photocatalysts for cocatalyst-free water splitting
- Efficient photoreforming of plastic waste using a high-entropy oxide catalyst
- Boosting hydrogen and methane formation on a high-entropy photocatalyst by integrating atomic d0/d10 electronic junctions and microscopic P/N heterojunctions
- Active photocatalysts for CO2 conversion by severe plastic deformation (SPD)