金属相1T´ MoS2增强类石墨相C3N4的可见光催化性能

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.

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

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.}