Hybrid Phase 1T/2H-MoS2 with Controllable 1T Concentration and Its Promoted Hydrogen Evolution Reaction
MoS2 has been investigated as a low-cost alternative to Pt in electrochemical hydrogen evolution reaction. One of the promising method to further activate MoS2 is phase engineering. MoS2 generally exhibit two kinds of crystalline: hexagonal 2H phase and octahedral 1T phase. 1T-MoS2 exhibits much better chemical/physical property than natural semiconductive 2H-MoS2. However, the 1T-MoS2 is metastable and challenging to be synthesized. Hybrid 1T/2H-MoS2 has been synthesized under relatively mild condition, but the controlling of 1T/2H ratio is still an issue which has not been discussed in detail. In this study, the synthesis methods of hybrid phase 1T/2H-MoS2 with controllable 1T concentration is investigated. The electrochemical hydrogen evolution reaction is then presented on different 1T content 1T/2H-MoS2 by both experiments and theoretical calculations.