| 초록 |
Two-dimensional (2D) metal chalcogenides, such as MoS2 and WS2, have emerged as an attractive material system for photoelectrochemical (PEC) water splitting because of their particular layer structure, great electric transportation property, and strong PEC reaction under sunlight. Particularly, MoS2 with high catalytic activity and its heterostructures have great potential for hydrogen evolution through PEC water splitting. Herein, we report the growth of two-dimensional few-layer MoS2 flakes on TiO2 nanowires using metal-organic chemical vapor deposition (MOCVD) and their PEC water splitting reaction. The MoS2 flake/TiO2 heterostructure showed higher PEC hydrogen generation than MoS2 film/TiO2 or MoS2 flake/FTO at 0 V. The improved PEC activity was attributed to vertically-aligned MoS2 flake structure and MoS2/TiO2 heterojunction, in which not only generated a significant amount of catalytically active edge site, but also enhanced light-harvesting ability. We will further discuss the effect of the size of vertically-standing MoS2 flakes on PEC performance. |
