AuPd/g-C_3N_4复合光催化剂可控制备及其光催化分解水产氢性能研究

Controllable Preparation of AuPd/g-C_3N_4 Composite Photocatalysts and Their Performances of Photocatalytic Hydrogen Production

采用两种不同的制备方法合成了AuPd/g-C_3N_4复合光催化剂,并采用透射电子显微镜、X射线光电子能谱、表面光电压谱等研究了材料组成成分及光生电荷的分离效率.研究结果表明,采用光还原原位制备的AuPd二元合金负载的光催化剂具有最优的光催化活性.当负载量为1.0wt%时,AuPd/g-C_3N_4(光)产氢速率是通过化学还原制备的7.4倍,达到了2 140μmol·g^(-1)·h^(-1).研究结果表明,AuPd纳米粒子有利于g-C_3N_4光催化剂产氢活性位点上光生电荷的有效分离.

The AuPd/g-C 3N 4 composite photocatalyst was synthesized by two different preparation methods.The separation efficiency of the material composition and photogenerated charge was studied by transmission electron microscopy,X-ray photoelectron spectroscopy and surface photovoltage spectroscopy.The results show that the AuPd binary alloy prepared by photoreduction has the best photocatalytic activity.The 1.0 wt%AuPd/g-C 3N 4(light)composite photocatalyst showed the best performance and corresponding H 2 evolution rate is 2 140μmol·g-1·h-1,which is enhanced by 7.4 times compared with that of AuPd/g-C 3N 4(chemical).The results show that the AuPd nanoparticles are beneficial to the effective separation of photogenerated charges in the active sites of hydrogen production of g-C 3N 4 photocatalysts.