Molybdenum disulfide(MoS2),as one of the transition metal dichalcogenides,has been extensively investigated as a promising electrocatalyst or photocatalyst for solar energy applications . Among its poly⁃morphs,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 absorp⁃tion and superior charge separation owing to great electron conductivity of 1T′MoS2. The kinetics model and degradation mechanism of the nanocomposites are also proposed.
国家科技期刊平台
NSTL
维普
万方数据
