高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (2): 615-623.doi: 10.7503/cjcu20200626

• 研究论文 • 上一篇    下一篇

金属相1T´ MoS2增强类石墨相C3N4的可见光催化性能

贾并泉,叶斌,赵伟,许钫钫,黄富强   

  1. 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
  • 收稿日期:2020-08-31 出版日期:2021-02-10 发布日期:2020-12-31
  • 基金资助:
    国家自然科学基金(批准号(21871008);21801247, 21905292)、 上海市科学技术委员会(18YF1427200);中国科学院重点研究项目(QYZDJ-SSW-JSC013);上海科学技术创新计划(20DZ1204400)

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

JIA Bingquan1,2, YE Bin1, ZHAO Wei1, XU Fangfang1, HUANG Fuqiang1,2,3()   

  1. 1.State Key Laboratory of High Performance Ceramics and Superfine Microstructure,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China
    2.Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China
    3.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
  • Received:2020-08-31 Online:2021-02-10 Published:2020-12-31
  • Contact: HUANG Fuqiang E-mail:huangfq@pku.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21871008);the Science and Technology Commission of Shanghai, China(18YF1427200);the Key Research Program of Chinese Academy of Sciences(QYZDJ-SSW-JSC013);the Shanhai Science and Technology Innovation Action Plan, China(20DZ1204400)

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6.24 μmol?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(4.64 μmol?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.

关键词: 1T′ MoS2, 二维复合材料, 光催化, 共催化剂

Abstract:

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 6.24 μmol?g?1?h?1 for H2 evolution compared with 4.64 μmol?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.

Key words: 1T′ MoS2, 2D nanocomposite, Photocatalysis, co-Catalyst

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