Effective improvement of photocatalytic hydrogen evolution via a facile in-situ solvothermal N-doping strategy in N-TiO₂/N-graphene nanocomposite

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• 作者：Fuyun Pei ; Shengang Xu ; Wei Zuo ; Zhenru Zhang ; Yingliang Liu ; ^{liuylxn@sohu.com" class="auth_mail} ; Shaokui Cao ; ^{caoshaokui@zzu.edu.cn" class="auth_mail}
• 关键词：Nitrogen-doping ; Nanocomposite ; Photocatalysis ; Hydrogen evolution ; Graphene
• 刊名：International Journal of Hydrogen Energy
• 出版年：24 April, 2014
• 年：2014
• 卷：39
• 期：13
• 页码：6845-6852
• 全文大小：1139 K

文摘

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 sp²-hybridized nitrogen. As a result, the photocatalytic efficiency of NTNG under ultraviolet irradiation is improved about 13.1 times compared to commercial P25.