Triphenylamine functionalized bithiazole-cobalt complex (Co-2TPABTz) sensitized by Ag nanoparticles (NPs) exhibit highly efficient photocatalytic hydrogen generation. The resulting composite 3 showed excellent photocatalytic activity (20:65 mmol h(-1) g(-1)) under visible light illumination, and maintained outstanding long-term stability after eight-cycle tests (32 h) as well. (C) 2016 Elsevier B.V. All rights reserved.