Abstract
Advanced approaches to preparing non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) are considered to be a significant breakthrough in promoting the exploration of renewable resources. In this work, a hybrid material of MoS2 nanoflowers (NFs) on reduced graphene oxide (rGO) was synthesized as a HER catalyst via an environmentally friendly, efficient approach that is also suitable for mass production. Small-sized MoS2 NFs with a diameter of ca. 190 nm and an abundance of exposed edges were prepared by a hydrothermal method and were subsequently supported on rGO by microwave-assisted synthesis. The results show that MoS2 NFs were distributed uniformly on the remarkably reduced GO and preserved the outstanding original structural features perfectly. Electrochemical tests show that the as-prepared hybrid material exhibited excellent HER activity, with a small Tafel slope of 80 mV/decade and a low overpotential of 170 mV.
Highlights
Nanosized MoS2 has attracted extensive attention as an effective hydrogen evolution reaction (HER) catalyst because of its excellent electrocatalytic properties [1,2,3,4,5]
The microstructure of MoS2 NFs prepared by the hydrothermal method was characterized by transmission electron microscopy (TEM), as shown in Figs 2a and 1b
No obvious aggregation is observed between the flower structures of nanosized MoS2; the MoS2 exhibits an interlayer spacing of 0.63 nm, and the thickness of MoS2 NF petals is 7.04 nm
Summary
Nanosized MoS2 has attracted extensive attention as an effective hydrogen evolution reaction (HER) catalyst because of its excellent electrocatalytic properties [1,2,3,4,5]. Synthesis of MoS2 NFs/rGO Hybrid as Hydrogen Evolution Reaction Electrocatalysts A hybrid catalyst of MoS2 NFs supported on reduced graphene oxide (rGO) shows HER activity with an overpotential of -190 mV and a Tafel slope of 95 mV per decade [14].
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