A hollow PtPdRhRuCoNi high-entropy alloy as an effective electrocatalyst for ethanol, ethylene glycol and glycerol oxidation.

The hollow PtPdRhRuCoNi high-entropy alloy was synthesized via an oil-bath and subsequent etching. With a specific surface area 1.7 times larger than Pt black, it exhibits superior activity and stability in 1 M KOH electrolytes containing ethanol, ethylene glycol, or glycerol. These improvements originate from the synergistic effect between its unique hollow architecture, which provides abundant accessible active sites, and its multi-element composition, which optimizes the electronic structure and facilitates efficient electron transfer.