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Self-Supported High-Entropy Alloy Electrocatalyst for Highly Efficient H2 Evolution in Acid Condition


Developing non-precious catalysts as Pt substitutes for electrochemical hydrogen evolution reaction (HER) with superior stability in acidic electrolyte is of critical importance for large-scale, low-cost hydrogen production from water. Herein, we report a CoCrFeNiAl high-entropy alloy (HEA) electrocatalyst with self-supported structure synthesized by mechanical alloying and spark plasma sintering (SPS) consolidation. The HEA after HF treatment and in situ electrochemical activation for 4000 cycles of cyclic voltammetry (HF-HEAa2) presents favourable activity with overpotential of 73 mV to reach a current density of 10 mA cm−2 and a Tafel slope of 39.7 mV dec−1. The alloy effect of Al/Cr with Co/Fe/Ni at atomic level, high-temperature crystallization, as well as consolidation by SPS endow CoCrFeNiAl HEA with high stability in 0.5 M H2SO4 solution. The superior performance of HF-HEAa2 is related with the presence of metal hydroxides/oxides groups on HEA.

Funding source: National Natural Science Foundation of China (51521001, 51832003). Fundamental Research Funds for the Central Universities (WUT: 2019IB002), National College Students Innovation and Entrepreneurship Training Program (2019-C-B1-25).
Related subjects: Production & Supply Chain

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