Surface Atomic Arrangements on High-Entropy-Alloy Nanocrystals Govern Alkaline Hydrogen Oxidation via Symmetry-Selected Multi-Atom Ensembles
High-entropy alloys (HEAs) provide compositionally diverse surfaces for electrocatalysis, yet how their surface atomic arrangements dictate active-site ensembles and catalytic activity remains unclear. Here, we develop a dropwise deposition strategy to synthesize Pd@Pd0.2Pt0.2Ir0.2Ru0.2Rh0.2 core–shell nanocrystals w...