High-entropy oxynitride as a low-bandgap and stable photocatalyst for hydrogen production

Metal oxynitrides are promising photocatalysts due to their narrow bandgap, but their lower stability compared to metal oxides is a drawback. The introduction of high-entropy alloys with entropy-stabilization features has shown high potential for various functional applications in recent years. By c...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-07, Vol.9 (26), p.1576-1586
Main Authors: Edalati, Parisa, Shen, Xiao-Feng, Watanabe, Motonori, Ishihara, Tatsumi, Arita, Makoto, Fuji, Masayoshi, Edalati, Kaveh
Format: Article
Language:English
Subjects:
Energy gap
High entropy alloys
Hydrogen production
Metal oxides
Oxides
Oxynitrides
Photocatalysis
Photocatalysts
Photoelectric effect
Photoelectric emission
Stability
Water splitting
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Summary:Metal oxynitrides are promising photocatalysts due to their narrow bandgap, but their lower stability compared to metal oxides is a drawback. The introduction of high-entropy alloys with entropy-stabilization features has shown high potential for various functional applications in recent years. By considering these two types of materials, we developed a high-entropy oxynitride for photocatalytic water splitting. The material, with a general composition of TiZrHfNbTaO 6 N 3 and a d 0 electronic configuration, showed a narrow bandgap of 1.6 eV, which is much lower than the bandgaps of relevant binary and high-entropy oxides. The material exhibited photocurrent generation and photocatalytic hydrogen production with high chemical stability, suggesting the high potential of high-entropy oxynitrides as advanced low-bandgap and stable photocatalysts. High-entropy oxynitride photocatalysts have the advantages of high-etropy alloys (high stability) and of oxynitrides (narrow bandgap).
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta03861c