金属相1T′MoS2增强类石墨相C3N4的可见光催化性能  

Metallic 1T′MoS2 Boosts Graphitic C3N4 for Efficient Visible-light Photocatalysis

作　　者：贾并泉 叶斌 赵伟[1] 许钫钫[1] 黄富强[1,2,3] JIA Bingquan;YE Bin;ZHAO Wei;XU Fangfang;HUANG Fuqiang(State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing100049,China;State Key Laboratory of Rare Earth Materials Chemistry and Applications and Beijing National Laboratory for Molecular Sciences,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China)

机构地区：[1]中国科学院上海硅酸盐研究所,高性能陶瓷和超微结构国家重点实验室,上海200050 [2]中国科学院大学,材料科学与光电子工程中心,北京100049 [3]北京大学化学与分子工程学院,稀土材料化学与应用国家重点实验室和北京分子国家重点实验室,北京100871

出　　处：《高等学校化学学报》2021年第2期615-623,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21871008,21801247,21905292);上海市科学技术委员会(批准号:18YF1427200);中国科学院重点研究项目(批准号:QYZDJ-SSW-JSC013);上海科学技术创新计划(批准号:20DZ1204400)资助.

摘　　要：通过煅烧和静电自组装的方法制备了1T′MoS2超薄纳米片和类石墨烯相氮化碳(g-C3N4)纳米片的复合材料.该材料在光催化实验中展现出6.24μmol·g^-1·h^-1的产氢速率,优于贵金属铂修饰的g-C3N4纳米片的性能(4.64μmol·g^-1·h^-1).此外,该复合材料在光催化降解有机染料甲基橙的实验中表现出0.19 min^-1的催化速率,而纯g-C3N4纳米片只有0.053 min^-1的催化速率.材料光催化性能的提升可归结于1T′MoS2和g-C3N4之间的协同效应,包括光吸收的增强以及因1T′MoS2优异电子导电性而得到的高效电荷分离.Molybdenum disulfide(MoS2),as one of thetransition metal dichalcogenides,has been extensively investigated as a promising electrocatalyst or photocatalyst for solar energy applications.Among its polymorphs,2H MoS2 and 1T MoS2 applied in visible-light-driven photocatalysis has been demonstrated,but the photocatalytic performance including activity and stability is unsatisfactory.Herein,a composite of 1T′MoS2 ultrathin nanosheets and carbon nitride(g-C3N4)nanosheets is fabricated by combining thermal annealing and an electrostatic self-assemble method.The as-prepared nanocomposites exhibit better photocatalytic activity as 6.24μmol∙g‒1∙h‒1 for H2 evolution compared with 4.64μmol∙g‒1∙h‒1 for Pt decorated g-C3N4 nanosheets under visible light irradiation.Apart from this,the composites also show 0.19 min‒1 for organic dye(methyl orange)degradation rate while the pure g-C3N4 exhibits 0.053 min‒1.The enhancement of photocatalytic performance can be ascribed to the synergistic effects between 1T′MoS2 and g-C3N4,which include improved light absorption and superior charge separation owing to great electron conductivity of 1T′MoS2.The kinetics model and degradation mechanism of the nanocomposites are also proposed.

关 键 词：1T′MoS2 二维复合材料 光催化 共催化剂 

分 类 号：O614.61[理学—无机化学]