Abstract

Molybdenum sulfide (MoS2) has emerged as a promising catalyst for hydrogen evolution applications. The synthesis method mainly employed is a conventional hydrothermal method. This method requires a longer time compared to other methods such as microwave synthesis methods. There is a lack of comparison of the two synthesis methods in terms of crystal morphology and its electrochemical activities. In this work, MoS2 nanosheets are synthesized using both hydrothermal (HT-MoS2) and advanced microwave methods (MW-MoS2), their crystal morphology, and catalytical efficiency towards hydrogen evolution reaction (HER) were compared. MoS2 nanosheet is obtained using microwave-assisted synthesis in a very short time (30 min) compared to the 24 h hydrothermal synthesis method. Both methods produce thin and aggregated nanosheets. However, the nanosheets synthesized by the microwave method have a less crumpled structure and smoother edges compared to the hydrothermal method. The as-prepared nanosheets are tested and used as a catalyst for hydrogen evolution results in nearly similar electrocatalytic performance. Experimental results showed that: HT-MoS2 displays a current density of 10 mA/cm2 at overpotential (−280 mV) compared to MW-MoS2 which requires −320 mV to produce a similar current density, suggesting that the HT-MoS2 more active towards hydrogen evolutions reaction.

Highlights

  • Two-dimensional (2D) transition-metal dichalcogenides (TMDs), such as MoS2, MoSe, WS2, have attracted much attention owing to their various applications

  • The nanosheets nanosheets obtained obtained by by microwave microwave methods methods show show thin thin and and uniform uniform morphology morphology confirmed confirmed by the SEM images

  • The as-prepared catalyst is catalyst compared in terms ofincrystal and catalytical

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Summary

Introduction

Two-dimensional (2D) transition-metal dichalcogenides (TMDs), such as MoS2 , MoSe, WS2 , have attracted much attention owing to their various applications. As a low-cost and layer-type transition metal dichalcogenide, MoS2 is considered to be a promising electrocatalyst candidate for use in the hydrogen evolution reaction (HER) [1,2] supercapacitor [3], and in battery research areas [4,5]. The origin of the high catalytic under coordinated coordinated sulfur catalytic activity activity of of MoS. H for the edge edge that that possess possess aa metallic for conversion conversion into into molecular molecular hydrogen.

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