可分散的In_2O_3/Ta_2O_5复合光催化剂的制备及其光催化制氢性能  

Photocatalytic Activity for Hydrogen Evolution over Well-Dispersed Heterostructured In_2O_3/Ta_2O_5 Composites

作　　者：许蕾蕾[1] 倪磊[1] 施伟东[1] 官建国[1] 

机构地区：[1]武汉理工大学材料复合新技术国家重点实验室,湖北武汉430070

出　　处：《催化学报》2012年第7期1101-1108,共8页

基　　金：国家自然科学基金(51002111;21001086);中国博士后科学基金(20100471163;201104494);湖北省自然科学基金(2010CDA030;2010CDB00606);武汉市学科带头人计划(201150530145)~~

摘　　要：通过控制乙醇钽的水解速率,在丙酮水溶液中制备了可分散的Ta2O5微球,并以此为载体构建了In2O3/Ta2O5异质结复合光催化剂,利用扫描电子显微镜、X射线能量色散光谱、粉末X射线衍射光谱、透射电子显微镜和紫外-可见漫反射光谱等手段对样品形貌、结构和光吸收性质进行了表征.结果表明,In2O3纳米粒子分布在Ta2O5微球表面,且两相间存在明显的界面,同时In2O3的复合拓宽了Ta2O5的光吸收范围,有利于光生电子与空穴的分离,使复合光催化剂在模拟太阳光照射下表现出更高的光解水制氢活性.Using well-dispersed Ta2O5 microspheres as supports, which were prepared by controlling the hydrolysis rates of tantalum ethoxide via the formation of glycolate in an acetone-water mixture, dispersible heterostructured In2O3/Ta2O5 composites were fabricated for photocatalytic hydrogen evolution under simulant solar light irradiation. The compositions, structure, morphologies, and optical absorption properties of these composites were characterized using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, transmission electron microscopy, and UV-Vis diffuse reflectance spectroscopy. The results show that in the as-prepared heterostructured In2O3/Ta2O5 composites, In2O3 nanoparticles are well distributed on the surface of Ta2O5 microspheres with a clear interface between the two phases. The incorporation of In2O3 extends the light absorption range and restricts photogenerated charge-carrier recombination, resulting in enhanced photocatalytic activity for hydrogen evolution.

关 键 词：可分散微球 五氧化二钽 三氧化二铟 异质结构 光催化 产氢 

分 类 号：TQ116.2[化学工程—无机化工]