MoS_2负载TiO_2纳米棒提高光催化制氢活性  

MoS_2 as a cocatalyst on TiO_2 nanorod for highly efficient hydrogen evolution

作　　者：刘梅 王雁鸿 陈威[1] 毛立群[1] LIU Mei;WANG Yanhong;CHEN Wei;MAO Liqun(College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,Henan,China)

机构地区：[1]河南大学化学化工学院,河南开封475004

出　　处：《化学研究》2018年第5期512-515,共4页Chemical Research

基　　金：河南省科技计划国际合作(162102410011);国家自然科学基金(51602091);河南省自然科学基金(182300410205)

摘　　要：光解水制氢技术是解决能源环境问题的理想途径.本研究采用水热法及离子交换法制备出TiO_2纳米棒,再用水热法将MoS_2担载到TiO_2表面制备MoS_2/TiO_2复合光催化剂.通过X射线衍射、紫外可见漫反射光谱和电镜对MoS_2/TiO_2进行表征.结果表明水热合成的锐钛矿TiO_2为棒状结构,负载并未改变TiO_2的晶型和形貌.活性测试表明,负载MoS_2后,TiO_2产生的光生电子能迅速传递到MoS_2表面,抑制了光生电子-空穴的复合,从而显著提高产氢活性.当负载量为0. 5%(w)时活性最高,为545. 6μmol/h,达到未负载MoS_2时的4. 2倍.Photocatalytic water splitting for hydrogen is an ideal way to solve environmental and energy crisis problems. In this paper, TiO 2 nanorod was prepared by a hydrothermal and ion exchange methods. Then, MoS 2 as a cocatalyst loaded TiO 2 nanorod by a hydrothermal method. The samples were characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy and transmission electron microscopy. The results show that anatase TiO 2 synthesized by the hydrothermal method appears as a rod-like structure, and the loading does not change the crystal structure and morphology of TiO 2 . The activity test of hydrogen production shows that the photogenerated electrons produced by TiO 2 can transfer to the surface of MoS 2 rapidly after the MoS 2 was loaded on TiO 2 , which suppresses the recombination of photogenerated electrons and holes, thus improving the hydrogen production activity of TiO 2 . The 5% MoS 2 /TiO 2 possesses the highest photocatalytic hydrogen evolution activity, reaching 545.6 μmol/h, which is 4.2 times of naked TiO 2 .

关 键 词：光催化 产氢 TiO2 MOS2 负载 

分 类 号：O643[理学—物理化学]