He Fang, Chen Gang, Yu Yaoguang, Hao Sue, Zhou Yansong, Zheng Yi
Department of Chemistry, Harbin Institute of Technology , Harbin 150001, P.R. China.
ACS Appl Mater Interfaces. 2014 May 28;6(10):7171-9. doi: 10.1021/am500198y. Epub 2014 May 14.
Novel composites consisting of graphitized polyacrylonitrile (g-PAN) nanosheets grown on layered g-C3N4 sheets were synthesized through a facile one-step thermal condensation of PAN and melamine for the first time. Photoluminescence spectroscopy and the photoelectrochemical measurements reveal that g-PAN nanosheets act as effective electron transfer channels to facilitate charge carrier separation in g-PAN/g-C3N4 composites. The g-PAN/g-C3N4 composites exhibit significantly enhanced visible-light photocatalytic performance for H2 evolution over pristine g-C3N4. The 5.0 wt % g-PAN/g-C3N4 composite has optimal H2 evolution rate of 37 μmol h(-1), exceeding 3.8 times over pristine g-C3N4. We have proposed a possible mechanism for charge separation and transfer in the g-PAN/g-C3N4 composites to explain the enhanced photocatalytic performance.
首次通过聚丙烯腈（PAN）和三聚氰胺的简便一步热缩合反应，合成了由生长在层状g-C3N4片材上的石墨化聚丙烯腈（g-PAN）纳米片组成的新型复合材料。光致发光光谱和光电化学测量结果表明，g-PAN纳米片作为有效的电子转移通道，促进了g-PAN/g-C3N4复合材料中电荷载流子的分离。与原始的g-C3N4相比，g-PAN/g-C3N4复合材料在可见光下的光催化产氢性能显著增强。5.0 wt%的g-PAN/g-C3N4复合材料具有37 μmol h(-1)的最佳产氢速率，比原始的g-C3N4高出3.8倍。我们提出了一种g-PAN/g-C3N4复合材料中电荷分离和转移的可能机制，以解释其增强的光催化性能。
