Solution Plasma‐Assisted Synthesis of Uniform Bimetallic PtCo Nanocrystals on N‐Doped Carbon for Efficient Hydrogen Evolution Reaction

Developing a time‐efficient, facile synthetic methodology for uniform and functionalized catalysts is essential to enhance the production efficiency and industrial applicability of heterogeneous catalysts. However, controlling the composition and structure without additional organic surfactants and complex multistep synthesis protocols remains challenging. Solution plasma process (SPP) is a promising strategy for the facile method to synthesize multimetallic nanocrystals embedded on surface‐engineered carbon supports. In this work, we report an in situ synthesis of bimetallic PtCo nanocrystals on a carbon support with tunable N‐doping levels via an SPP. Uniform sub‐2 nm PtCo nanocrystals were formed through a single‐step process within minutes. The optimized PtCo/N‐doped carbon catalyst exhibited enhanced activity and long‐term stability for the alkaline hydrogen evolution reaction compared to commercial Pt/C.