We conclude the review with the discussion of the challenges and opportunities of HEA catalysts. strain, ligand and ensemble effects) and d-band center are discussed in detail, and their impacts on the adsorption energy of intermediates in catalytic reactions are emphasized. The relationships among metastable microstructures, substitution effects ( i.e. The research progress in the application of HEAs in heterogeneous catalysis is subsequently reviewed from the perspectives of both theory and experiment. Then, four core effects of HEAs, namely high entropy, cocktail effect, lattice distortion and sluggish diffusion, are briefly introduced, and their impacts on the catalytic properties of HEAs are highlighted. This review firstly summarizes the current synthetic methods of nanostructured HEA catalysts. Although a very limited amount of work has been reported, higher activities of HEAs than traditional catalysts have been confirmed. Their unique configuration and attractive properties make HEAs one of the most promising catalysts. High-entropy alloys (HEAs) have evolved to be one of the most popular materials in the last decade.
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