二硫化钼量子点-氧化石墨烯复合材料的制备及其光催化产氢性能研究  

MoS_2 quantum dots-decorated graphene oxide for enhanced photocatalytic H_2 evolution

作　　者：王敏[1] WANG Min(Laboratory of Clean Energy Chemistry and Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China)

机构地区：[1]中国科学院兰州化学物理研究所清洁能源化学与材料实验室,甘肃兰州730000

出　　处：《西北师范大学学报（自然科学版）》2018年第1期38-42,共5页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(61376066;21401203)

摘　　要：采用超声法制备了MoS_2量子点,将其与氧化石墨烯复合,并将复合材料(MG)应用于光催化分解水制氢.利用透射电子显微镜、N_2吸收仪、电化学工作站和气相色谱仪分别测试了复合材料的形貌、N2等温吸附脱附曲线、电化学阻抗、光电流响应和光催化产氢速率.结果表明,氧化石墨烯的含量为2.0%时,产物的光催化效率达到最高.复合材料MG-2.0优异的光催化性能主要归功于催化剂中MoS_2量子点分散性提高而导致产物比表面积增大与活性位点含量的提高;另外,电子传输介质氧化石墨烯的存在可有效地促进光生载流子的分离.In this paper,graphene oxide nanosheets decorated with MoS2quantum dots were used as photocatalysts in water splitting for H2production.The morphology,N2adsorption/desorption isotherm curves,Nyquist plots,J-t curves,and the photocatalytic performance of MoS2quantum dots graphene oxide(MG)composite were examined.This study indicates that the MG composite reaches the highest hydrogen evolution rate at graphene oxide content of20wt%.This high photocatalytic performance is attributed to the improved specific surface area and the enriched active sites.Moreover,the enhanced photocatalytic activity also is associated with the presence of graphene oxide,which serves as an electron transporter to facilitate the separation of photogenerated charge carriers.

关 键 词：MOS2 纳米材料 光催化 

分 类 号：TQ127.11[化学工程—无机化工]