Synthesis of high-entropy alloy nanoparticles on supports by the fast moving bed pyrolysis.

ABSTRACT: 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, ?-Al₂O₃, 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.

SUBMITTER: Gao S 

PROVIDER: S-EPMC7181682 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature