Electrochemical water splitting is a promising technology for hydrogen production. However, the high energy consumption and catalyst costs remain major bottlenecks hindering its large-scale application.FeCoNiCuPd high-entropy alloy bulk material is prepared using conventional melting methods, followed by dealloying treatment via electrochemical corrosion.Electrochemical measurements reveal that dealloying significantly enhances the hydrogen evolution reaction performance of the FeCoNiCuPd high-entropy alloy.The overpotential at a current density of 10 mA·cm-² is as low as 73 mV, outperforming that of pure Pt catalyst, while the alloy also exhibits excellent long-term stability.The dealloying process creates a heterogeneous porous structure in the FeCoNiCuPd high-entropy alloy, which combines with the synergistic effects among the multiple metal components, substantially increases the specific surface area and the number of active sites.As a result, the high-entropy alloy demonstrates outstanding catalytic activity as an electrocatalyst for hydrogen evolution via water splitting.
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