Enhancement of visible photocatalytic activity via Ag@C3N4 core–shell plasmonic composite

Abstract A novel and simple synthetic approach toward core–shell Ag@C 3 N 4 nanocomposites is developed. Ag@C 3 N 4 core–shell nanostructures were formed via reflux treatment of Ag nanoparticles with graphitic C 3 N 4 nanosheets in methanol. The core–shell hybrid photocatalysts showed dramatic photoinduced electron–hole separation efficiency and photocatalytic activity under visible light irradiation. The photocurrent intensity, photocatalytic activity for the photodegradation of methylene blue (MB) and hydrogen evolution reaction of Ag@C 3 N 4 were about 4, 1.8 and 30 times as that of pure C 3 N 4 sample, respectively. The enhanced photocatalytic activity for core–shell Ag@C 3 N 4 originated from a combined result of the localized surface plasmon resonance (LSPR) effect for Ag and hybrid effect from C 3 N 4 , resulting in the coupling interaction of the enhanced light absorption intensity, high separation efficiency of photogenerated electrons–holes, longer lifetime of charge carriers and its favorable adsorptivity.