MoS2 (1T/2H)/g-C3N4 heterojunctions created via Mo seed growth in situ towards high photo- and electro-chemical performance

Abstract It is an effective way to construct graphic carbon nitrate (g-C3N4) based heterostructures with strong interfacial effect for improving their photocatalytic performance. In this paper, Mo was introduced into g-C3N4 nanosheets as seeds to create MoS2/g-C3N4 (MSCN) composite material by a solvothermal synthesis at low temperature. The interface between MoS2 and g-C3N4 was therefore improved, in which MoS2 exhibited 1T and 2H phases. Compared with pure CN, the MSCN composite material broadened the light absorption range, enhanced the charge transfer kinetics and reduced the recombination of photogenerated carriers. The photo- and electro-chemical characterization indicated that sample MSCN-6 revealed the best photocatalytic performance, in which the degradation rate of 2,4-dichlorophenol was up to 84.1% and the photocatalytic hydrogen production rate was 1683.9 μmol/g/h, which were 1.67 and 3.61 times of those of pure g-C3N4, respectively. The quenching experiment of the active substance demonstrated that h+ was the contributing active substances. The result provides new idea for designing composite photocatalysts with high efficiency, high visible light absorption and strong interface coupling.