High entropy oxides have been regarded as one of the most promising catalysts.Their unique and diverse elemental compositions bring stable structures and abundant metal active sites to the cata-lysts.Notably,rare earth ions have similar radii,unique electron orbitals,and variable valence states.As a result,incorporating rare earth elements into high entropy oxides can effectively adjust the surface state of the catalyst,ultimately improving the structure and properties of the high en-tropy oxides.However,there is no systematic review on the development of rare earth-incorporated high entropy oxides.In this review,we target the structure,synthesis,and ap-plication of rare earth-incorporated high entropy oxides to summarize their research progress in catalysis in recent years.First,we provide an overview of three types of rare earth-incorporated high entropy oxides:fluorite-type,perovskite-type,and pyrochlore-type.Then,the main synthesis methods are discussed in detail,including solid-state reaction,nebulized spray pyrolysis,chemical co-precipitation,and solution combustion.Finally,we analyze the applications of this material in catalytic reactions and suggest possible challenges and solution strategies.It is concluded that this unique material has good prospects for development.
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