N掺杂Ta_2O_5的制备及其光催化分解水制氢性能研究  

FABRICATION OF N-DOPED Ta_2O_5 CATALYSTS AND ITS PERFORMANCE FOR PHOTOCATALYTIC PRODUCTION OF HYDROGEN

作　　者：梁慧荣[1] 张耀君[1] 郭烈锦[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《太阳能学报》2006年第10期1032-1036,共5页Acta Energiae Solaris Sinica

基　　金：国家973计划项目(No.2003CB214500)

摘　　要：通过对Ta2O5程序升温的氮化方法,制备了在可见区具有较强吸收的N掺杂Ta2O5光催化剂,并采用X射线衍射(XRD)、UV-Vis漫反射光谱、X射线荧光(XRF)、扫描电镜(SEM)等化学物理手段对其进行了表征,其吸收阈约为630nm,带隙约为2.0eV。在乙醇和Na2S-Na2SO3牺牲剂体系中,研究了N掺杂Ta2O5催化剂的可见光催化分解水制氢性能,并考察了采用光还原法在N掺杂Ta2O5表面上负载贵金属Ru对光催化剂的产氢活性影响,探讨了Ru的负载量与产氢速率的关系,结果表明在N掺杂Ta2O5表面上负载贵金属Ru可明显提高其产氢活性,Ru的最佳负载量约为0.1 wt.%。N-doped Ta2O5 catalyst with strong visible-light response was prepared by the temperature-programmed nitridation of tantalum pentoxide and characterized using XRD, UV-Vis, XRF, and SEM. The absorption edge of the catalyst is about 630 nm and the energy gap is about 2.0 eV. The activities of hydrogen production for the N-doped Ta2O5 catalysts were studied by water splitting in the aqueous ethanol or Na2S-Na2SO3 solution under the visible light irradiation. The relationship between the amount of loading Ru and the rate of hydrogen evolution were investigated. The results show that the efficiency of hydrogen evolution can be greatly improved by photo-depositing Ru on the surface of N-doped Ta2O5 catalysts and the optimal amount of loading Ru is about 0.1 wt. %.

关 键 词：掺杂 TA2O5 光催化 氢 半导体 

分 类 号：O643[理学—物理化学]