Abstract
Introduction: Using the metal organic chemical vapor deposition (MOCVD) method, we have synthesized the MoS2 nanoparticles on graphite foil substrates employed as the electrochemical working electrodes with highly efficient electrocatalysis for hydrogen evolution reaction (HER).
 Methods: The morphological and structural properties of the as-grown MoS2 materials were demonstrated by field emission scanning electron microscope (FESEM) and Raman spectroscopies, while their elemental components were investigated by X-ray photoelectron spectroscopy (XPS).
 Results: The optimum growth time was acquired to be 11 hours. Thereby such obtained electrode exhibited the maximum HER activity with onset over the potential of 220 mV versus reversible hydrogen electrode (RHE), and the Tafel slope of 66 mV per decade (mV/dec).
 Conclusion: Our results suggest a good technique for the research of high-efficient HER electrocatalyst based on atomic-thickness layered materials.
Highlights
Using the metal organic chemical vapor deposition (MOCVD) method, we have synthesized the MoS2 nanoparticles on graphite foil substrates employed as the electrochemical working electrodes with highly efficient electrocatalysis for hydrogen evolution reaction (HER)
This work focused on the dependence of HER performance on the MOCVD growing condition, the growth time
We found the sample grown in 11h to exhibit the highest HER activity with the smallest onset overpotential of 250 mV per decade (mV/dec), and the Tafel slope of 66 mV/dec
Summary
Using the metal organic chemical vapor deposition (MOCVD) method, we have synthesized the MoS2 nanoparticles on graphite foil substrates employed as the electrochemical working electrodes with highly efficient electrocatalysis for hydrogen evolution reaction (HER). Numerous reports have focused on maximizing the exposured active-edge-sites, arming to enhance the HER activity of MoS2 These efforts can be the growth of vertical nanoflakes 12, nanobelts 13, mesoporous [14,15], or nanoparticles 16. Due to low intrinsic conductivity in MoS2, one can reduce the number of layers to minimum the charge transfer resistance between the exposure surface at the outmost layer and the electrode 17 In this regard, a small number of layers was demonstrated as another important expect for highly catalytic HER performance in MoS2 nanostructure. We found the sample grown in 11h to exhibit the highest HER activity with the smallest onset overpotential of 250 mV/dec, and the Tafel slope of 66 mV/dec
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