Ag@Pt core-shell icosahedral nanocrystals with solid solution interface improve pH-Universal hydrogen evolution at large current densities

Key Words:TOTAL-ENERGY CALCULATIONS; HIGHLY EFFICIENT; ELECTROCATALYST; NANOSTRUCTURES; NITROGEN; DESIGN

Abstract:Industrial application of electrochemical hydrogen production urgently requires the development of highly efficient, stable, and inexpensive electrocatalysts that can drive a large current density. Here, Ag@Pt icosahedral nanocrystals (Ag@Pt icosahedral NCs) catalysts were successfully prepared through one-step solvothermal synthesis for addressing those challenges. The synergies of geometric effect and electronic effect triggered by the discrepancy of different components greatly enhance the electrocatalytic performance in the hydrogen evolution reaction (HER) process at large current densities over wide pH ranges. Excitingly, the Ag@Pt icosahedral NCs could reach 4000 mA cm-2 at 232 mV under the acidic medium and also showed efficient catalytic activity in 1 M KOH and 1 M phosphate buffered saline (PBS) media, improving their potential application in industrialization. Density functional theory (DFT) calculation results show that the electronic synergistic effect brought by the core-shell structure weakens the optimal free energy of hydrogen adsorption (Delta GH*), promoting the water decomposition kinetics and greatly achieving high catalytic performance.

Volume:254

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Translation or Not:no