A Self-supported High-entropy Metallic Glass with Nanosponge Architecture for Efficient Hydrogen Evolution under Alkaline and Acidic Conditions

Inspired by the recently promising high-entropy concept with inherent multinary nature and glassy alloy with chemical homogeneity and tunability, we present a scalable strategy to alloy five equiatomic elements, PdPtCuNiP, into a high-entropy metallic glass (HEMG) for HER in alkaline and acidic conditions.
Surface dealloying of the HEMG creates a nanosponge-like architecture with nanopores and embedded nanocrystals that provide abundant active sites to achieve outstanding HER activity.
The obtained overpotentials at the current density of 10 mA cm-2 are 32 and 62 mV in 1.0 M KOH and 0.5 M H2SO4 solutions, respectively, outperforming most currently available electrocatalysts.