A feasible and environmentally friendly method to simultaneously synthesize MoS2 quantum dots and pore-rich monolayer MoS2 for hydrogen evolution reaction

• Published in: International journal of hydrogen energy 2020-01, Vol.45 (1), p.433-442
• Main Authors: Zhou, Qiulan, Luo, Xiaohu, Li, Yali, Nan, Yanxia, Deng, Haoyun, Ou, Encai, Xu, Weijian
• Format: Article
• Language: English
• Subjects: Gas phase etching; Hydrogen evolution reaction; MoS2 quantum dots; Pore-rich monolayer MoS2
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2019.10.167

MoS2 has been one of a widely researched hydrogen evolution reaction (HER) catalyst materials in recent years. However, the basal plane of MoS2 is considered to be inactive to hinder its further development. Herein, a new mass-scalable and facile intercalation method for the fabrication of multiple products, including pore-rich monolayer MoS2 (PR MoS2) and MoS2 quantum dots (MoS2 QDs), has been developed via the gas phase etching of bulk MoS2 in an acetone vapor atmosphere. The obtained monolayer MoS2 QDs with a narrow lateral size distribution (average size: 2.5 nm) present excitation-independent photoluminescence emission. Furthermore, the PR MoS2 shows a significantly enhanced HER electrocatalytic activity and good stability in 0.5 M H2SO4 solution with a small overpotential of 241 mV at a current density of 10 mA cm−2. These results demonstrate that the as-prepared PR MoS2 is very promising for the application in HER. [Display omitted] •MoS2 quantum dots and pore-rich monolayer MoS2 are simultaneously synthesized.•2H–MoS2, 1T-MoS2 and amorphous MoS2 coexist in pore-rich monolayer MoS2.•Pore-rich structure and different phases provide enormous active edge defects.•Pore-rich monolayer MoS2 shows better HER performance than bulk MoS2.