High-entropy alloy nanoparticles (HEA-NPs) are important class of materials with significant technological potential. However, the strategies for synthesizing uniformly dispersed HEA-NPs on granular supports such as carbon materials, γ-Al 2 O 3 , and zeolite, which is vital to their practical applications, are largely unexplored. Herein, we present a fast moving bed pyrolysis strategy to immobilize HEA-NPs on granular supports with a narrow size distribution of 2 nm up to denary (MnCoNiCuRhPdSnIrPtAu) HEA-NPs at 923 K. Fast moving bed pyrolysis strategy ensures the mixed metal precursors rapidly and simultaneously pyrolyzed at high temperatures, resulting in nuclei with a small size. The representative quinary (FeCoPdIrPt) HEA-NPs exhibit high stability (150 h) toward hydrogen evolution reaction with high mass activity, which is 26 times higher than the commercial Pt/C at an overpotential of 100 mV. Our strategy provides an improved methodology for synthesizing HEA-NPs on various supports.

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Discovering the multimetallic electrocatalyts with more active sites, superstability, and higher active areas toward oxygen evolution reaction (OER) is highly urgent for energy reserves. Herein, this work puts forward a novel ternary NiCoRu-layered double hydroxide (NiCoRu-LDH) synthesized via a facile one-step chloride (Cl − ) corrosion for Ni foam (NF) in the situ process as an excellent electrocatalyst toward OER. The introduction of Ru cations prominently altered the electronic properties of NiCo-LDH, exposing more surface active sites, and optimizing the intermediates of adsorption oxygen (OOH*) for water oxidation. As expected, the obtained trimetallic NiCoRu-LDH/NF electrode revealed a fairly low overpotential toward OER (270 mV at 100 mA•cm −2 ) with a Tafel slope of 40 mV•dec −1 and prolonged stability (55 h at 100 mA•cm −2 ) in alkaline solution, outperforming most of the hydroxide-based electrocatalysts currently reported. Our work demonstrates an effective approach to designing the highly efficient multimetallic electrodes toward OER.