A stable and efficient photocatalytic hydrogen evolution system based on covalently linked silicon-phthalocyanine-graphene with surfactant

摘要

A new hybrid silicon-phthalocyanine phenyl covalently functionalized graphene (SiPc(phenyl)(2)G(2)) was synthesized. The high fluorescence quenching efficiency and enhanced photocurrent suggested a rapid photoinduced energy transfer from SiPc(phenyl) moiety to graphene sheets through the covalent bond. Using the above synthesized hybrid as a photosensitizer, the SiPc(phenyl)(2)G(2) functionalized Pt nanocomposite (SiPc(phenyl)(2)G(2)/Pt) was easily obtained via photodeposition method. The as-prepared SiPc(phenyl)(2)G(2)/Pt showed efficient photocatalytic hydrogen generation from water splitting under both UV vis and visible light irradiation. Interestingly, with the aid of surfactants, the photo catalytic activity and stability of the SiPc(phenyl)(2)G(2)/Pt nanocomposites in the solution were distinctly improved owning to the nanocomposite aggregation prevention. This investigation demonstrates a unique approach to construct stable high photoresponisve organic hybrid composites for solar energy utilization. (C) 2015 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.