TiO_2/CoTiO_3纳米复合体的制备及可见光催化产氢性能  

Preparation of TiO_2/CoTiO_3 nanocomposite and its visible-light-driven photocatalytic H_2 evolution performance

作　　者：孙宁[1,2] 曲阳[1,2] 井立强[1,2] 

机构地区：[1]黑龙江大学化学化工与材料学院,哈尔滨150080 [2]功能无机材料化学教育部重点实验室,哈尔滨150080

出　　处：《中国科技论文》2016年第18期2105-2109,2129,共6页China Sciencepaper

基　　金：高等学校博士学科点专项科研基金资助项目(20122301110002);国家自然科学基金资助项目(U1401245;21501052)

摘　　要：为了提高CoTiO_3的可见光催化产氢活性,采用溶剂热法制备了CoTiO_3纳米棒,然后采用湿化学法将TiO_2纳米颗粒复合在CoTiO_3纳米棒表面,获得不同TiO_2与CoTiO_3质量比的TiO_2/CoTiO_3纳米复合体。研究结果表明,复合适量的TiO_2纳米颗粒能够改善CoTiO_3纳米棒的可见光催化产氢活性,其中TiO_2占CoTiO_3质量分数为10%时,可见光催化性能最优。表面光电压谱等测试证明,在可见光激发下,CoTiO_3产生的高能级电子可以有效转移到TiO_2的导带上,进而既可促进光生电荷的空间分离,又在一定程度上维持了高能级电子的还原能力。因此,TiO_2/CoTiO_3纳米复合体表现出了高可见光催化活性。To improve the visible-light-driven photocatalytic H2 evolution activity of CoTiO3, TiO2/CoTiO3 nanocomposites with different mass ratios were successfully prepared by coupling anatase TiO2 nanoerystalline onto the surface of CoTiO3 nanorods which was synthesized by solvothermal method. The results show that coupling with an appropriate amount of TiO2 nanoparticles can improve charge separation and visible light photocatalytie activity of hydrogen evolution of CoTiO3, and 10% of TiO2 loading possesses the optimal photocatalytic activity. The enhanced photocatalytic activity can be ascribed to the suitable conduction band of TiO2 as a platform for accepting high-level-energy electrons from CoTiO3 excited by visible light, so as to improve the charge separation spatially.

关 键 词：物理化学 TiO2/CoTiO3纳米复合体 光生电荷分离 表面光电压谱 可见光催化产氢 

分 类 号：O643.36[理学—物理化学] TQ116.2[理学—化学]