Morphological, structural and compositional evolution of PtPdFeCoNi high-entropy alloy nanoparticles towards bifunctional oxygen electrocatalysis

The PtPdFeCoNi HEA nanoparticles show high ORR stability with minimal surface changes, while OER triggers formation of a redox-active Ni, Co, Fe-based (oxy)hydroxide that enhances kinetics, leading to a Δ E of 0.71 V showing enhanced OER/ORR activity.