▎ 摘　　要

Nanocomposite NTNG composed of nitrogen-doped titanium dioxide (N-TiO2) and nitrogen-doped graphene (N-graphene) is synthesized to increase the photocatalytic efficiency for hydrogen production through a convenient in-situ solvothermal nitrogen-doping strategy. TEM and AFM images suggested that NTNG nanosheet consists of approximately 1-5 layers by folding its own sheet and that the wrinkled multilayer textures are stretched to a large extent due to the uniformly anchored N-TiO2 nanoparticles on N-graphene surface effectively avoiding the aggregation. XPS results indicated that the in-situ solvothermal nitrogen-doping not only allows the nitrogen-doping of TiO2 but also further changes the nitrogen-doping state of N-graphene including the nitrogen content and the ratio of dopant types. Raman spectroscopy told us that N-graphene in NTNG is more ordered than separate N-graphene due to fewer defects from the improved sp(2)-hybridized nitrogen. As a result, the photocatalytic efficiency of NTNG under ultraviolet irradiation is improved about 13.1 times compared to commercial P25. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.