Preparation and Application of High-Entropy Oxynitrides by Mechanical Stress

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  • メカニカルストレスによる高エントロピー酸窒化物の作製とその応用

Abstract

<p>Using the clean fuels such as H2 is a promising alternative to be used instead of fossil fuels due to global warming issue. In this regard, photocatalytic H2 evolution is the cleanest way to produce this useful component. There have been various attempts to introduce the photocatalysts for this application and among them metal oxynitrides have attracted attention due to their low bandgap. High-entropy ceramics are also new and promising materials due to their superior properties specially in catalysis. In this study, the concept of combination of metal oxynitrides and high-entropy ceramics led to design and produce a new high-entropy oxynitride (HEON) for photocatalytic H2 evolution for the first time. This HEON successfully produces the H2 because of its high light absorbance much better than relevant binary and high-entropy oxides and low bandgap around 1.6 eV. The H2 production amount of this material was higher than Ga6ZnON6 as a convectional oxynitride for this application.</p>

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