The us-HEA/C achieves an ultrahigh mass activity of 28.3 A mg -1 noble metals at -0.05 V (vs the reversible hydrogen electrode, RHE) for HER in 0.5 M H 2SO 4 solution, which is 40.4 and 74.5 times higher than those of the commercial Pt/C and Rh/C catalysts, respectively. The atomic structure, coordinational structure, and electronic structure of the us-HEAs were comprehensively clarified.
The us-HEA (NiCoFePtRh) NPs show an average diameter of 1.68 nm, which is the smallest size in the reported HEAs. Here, we report ultrasmall high-entropy alloy (us-HEA) nanoparticles (NPs) with the best-level performance for hydrogen evolution reaction (HER). The development of sufficiently effective catalysts with extremely superior performance for electrocatalytic hydrogen production still remains a formidable challenge, especially in acidic media.
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