Solvent-Assisted Oxygen Incorporation of Vertically Aligned MoS2 Ultrathin Nanosheets Decorated on Reduced Graphene Oxide for Improved Electrocatalytic Hydrogen Evolution.
Three-dimensional oxygen-incorporated MoS2 ultrathin nanosheets decorated on reduced graphene oxide (O-MoS2/rGO) had been successfully fabricated through a facile solvent-assisted hydrothermal method. The origin of the incorporated oxygen and its incorporation mechanism into MoS2 were carefully investigated. We found that the solvent N,N-dimethylformamide (DMF) was the key as the reducing agent and the oxygen donor, expanding interlayer spaces and improving intrinsic conductivity of MoS2 sheets (modulating its electronic structure and vertical edge sites). These O dopants, vertically aligned edges and decoration with rGO gave effectively improved double-layer capacitance and catalytic performance for hydrogen evolution reaction (HER) of MoS2. The prepared O-MoS2/rGO catalysts showed an exceptional small Tafel slope of 40 mV/decade, a high current density of 20 mA/cm(2) at the overpotential of 200 mV and remarkable stability even after 2000th continuous HER test in the acid media.
Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University , Hangzhou 310018, China.|State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences , Beijing 100190, China.
Aiping
A
Liu
Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University , Hangzhou 310018, China.
Li
L
Zhao
Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University , Hangzhou 310018, China.
Junma
J
Zhang
College of Engineering, Mathematics and Physical Sciences, University of Exeter , Exeter, EX4 4QL, U.K.
Liangxu
L
Lin
A Key Laboratory of E&M (Zhejiang University of Technology) , Ministry of Education & Zhejiang Province, Hangzhou 310014, China.
Huaping
H
Wu
MoS2 nanosheets; electrochemistry; graphene oxide; hydrogen evolution; oxygen incorporation; vertically aligned