Metallic 1T phase MoS2 nanosheets as a highly efficient co-catalyst for the photocatalytic hydrogen evolution of CdS nanorods

摘要

Conversion of solar energy to hydrogen requires efficient, low-cost and earth-abundant H-producing photocatalysts. Herein, a novel noble metal-free photocatalyst 1T-MoS2/CdS NRs was prepared via a simple method. The 1T-MoS2/CdS NRs hybrid showed the highest photocatalytic activity when the optimized weight ratio of metallic 1T-MoS2 to CdS NRs is 10 wt% in a lactic acid solution under visible light. A 794.93 mu mol h(-1) H-2 evolution rate of the 1T-MoS2/CdS NRs hybrid reached not only 35 times improvement than pure CdS NRs but also 4.5 times enhancement than the 2H-MoS2/CdS NRs hybrid. The relative mechanism has been investigated. 1T-MoS2/CdS NRs interfaces could form ohmic contact with very low contact resistances to promote photoexcited electron transfer, which was different from the p/n junction on the 2H-MoS2/CdS NRs hybrid.