Chen Dejian, Zou Liling, Li Shunxing, Zheng Fengying
College of Chemistry and Environment, Minnan Normal University, Zhangzhou, 363000, China.
Sci Rep. 2016 Feb 1;6:20335. doi: 10.1038/srep20335.
Modification of titanium dioxide (TiO2) for H2 generation is a grand challenge due to its high chemical inertness, large bandgap, narrow light-response range and rapid recombination of electrons and holes. Herein, we report a simple process to prepare nanospherical like reduced graphene oxide (NS-rGO) decorated TiO2 nanoparticles (NS-rGO/TiO2) as photocatalysts. This modified TiO2 sample exhibits remarkably significant improvement on visible light absorption, narrow band gap and efficient charge collection and separation. The photocatalytic H2 production rate of NS-rGO/TiO2 is high as 13996 μmol g(-1) h(-1), which exceeds that obtained on TiO2 alone and TiO2 with parallel graphene sheets by 3.45 and 3.05 times, respectively. This improvement is due to the presence of NS-rGO as an electron collector and transporter. The geometry of NS-rGO should be effective in the design of a graphene/TiO2 composite for photocatalytic applications.
由于二氧化钛（TiO₂）具有高化学惰性、大带隙、窄光响应范围以及电子和空穴的快速复合，对其进行用于氢气生成的改性是一项巨大挑战。在此，我们报道了一种制备纳米球状还原氧化石墨烯（NS-rGO）修饰的TiO₂纳米颗粒（NS-rGO/TiO₂）作为光催化剂的简单方法。这种改性的TiO₂样品在可见光吸收、窄带隙以及有效的电荷收集和分离方面表现出显著改善。NS-rGO/TiO₂的光催化产氢速率高达13996 μmol g⁻¹ h⁻¹，分别比单独的TiO₂以及具有平行石墨烯片的TiO₂高出3.45倍和3.05倍。这种改善归因于NS-rGO作为电子收集器和传输器的存在。NS-rGO的几何结构在用于光催化应用的石墨烯/TiO₂复合材料设计中应该是有效的。
