Abstract
Hydrogen has been considered as the clean and renewable energy source of the next generation by virtue of its high energy density and environmentally friendly combustion product. Electrochemically evolving hydrogen by splitting water is one of the most efficient strategies for hydrogen generation. Previous studies have revealed that two-dimensional layered molybdenum disulfide (MoS 2 ) based materials would be the promising HER catalysts. Tuning the electronic density of MoS 2 electrocatalyst has emerged as an effective strategy to optimize the electrocatalytic activities. Herein, we utilized in-situ reduction method to synthesize gold nanoparticles modified MoS 2 nanosheets (Au-MoS 2 ) hybrid. X-ray photoelectron spectroscopy and Raman spectroscopy were used to confirm the strong electronic interaction between Au and MoS 2 . The Au-MoS 2 shows superior electrocatalytic activity towards HER, as evidenced by the onset potential decreased by 50 mV as compared to ce-MoS 2 . The HER enhancement can be largely attributed to the increase of carrier density in MoS 2 injected from Au nanoparticles, which results in the modulation of the energy level of MoS 2 more comparable to HER.
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