Enhanced Separation Efficiency of PtNix/g‐C₃N₄ for Photocatalytic Hydrogen Production

Bimetallic materials hold promise for improving catalyst activity, yet little is known about the photocatalytic mechanism that these systems undergo during photocatalytic reaction that lead to efficient catalyst. Herein, we synthesized g‐C 3 N 4 combined with PtNi x , which shows much higher photocatalytic activity than that of pure g‐C 3 N 4 and achieves the highest H 2 evolution rate of 8456 μmol h −1 g −1 for 2.5 % PtNi x /g‐C 3 N 4 . The excellent photocatalytic activity resulted from the enhanced charge‐separation efficiency compared to the pristine g‐C 3 N 4 , which was proved by surface photovoltage, photoluminescence, and transient photovoltage spectra. Electrochemical impedance spectroscopy in the dark further confirms the ability of charge transfer of 2.5 % PtNi x /g‐C 3 N 4 is superior to that of pure g‐C 3 N 4 . This effective separation efficiency gives rise to the observed excellent photocatalytic activity. This study not only provides us with an efficient catalyst for water splitting, but opens new avenues for designing and developing platinum‐based photocatalysts.