LAUSR

High-entropy alloy nanoparticles (HEA-NPs) have attracted great attention because of their unique complex compositions and tailorable properties. Further expanding the compositional space is of great significance for enriching the material library. Here, we develop a step-alloying strategy to synthesis HEA-NPs containing a range of strongly repellent elements (e.g., Bi-W) by using the Rich-Pt cores formed during the first liquid phase reaction as the seed of the second thermal diffusion. Remarkably, the representative HEA-NPs-(14) with up to 14 elements exhibits extremely excellent multifunctional electrocatalytic performance for pH-universal hydrogen evolution reaction (HER), alkaline methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). Briefly, HEA-NPs-(14) only requires the ultra-low overpotentials of 11 and 18 mV to deliver 10 mA cm-2 and exhibits ultra-long durability for 400 and 264 hours under 100 mA cm-2 in 0.5 M H2 SO4 and 1 M KOH respectively, which surpasses most advanced pH-universal HER catalysts. Moreover, HEA-NPs-(14) also exhibits an impressive peak current density of 12.6 A mg-1 Pt in 1 M KOH + 1 M MeOH and a half-wave potential of 0.86 V (versus RHE.) in 0.1 M KOH. Our work further expands the spectrum of possible metal alloys, which is important for the broad compositional space and future data-driven material discovery. This article is protected by copyright. All rights reserved.