| Summary: | Transition-metal dichalcogenides (TMDs) materials have attracted much attention for hydrogen evolution reaction (HER) as a new catalyst, but they still have challenges in poor stability and high reaction over-potential. In this study, ultra-thin SnS<sub>2</sub> nanocatalysts were synthesized by simple hydrothermal method, and low load of Pt was added to form stable SnS<sub>2</sub>-Pt-3 (the content of platinum is 0.5 wt %). The synergistic effect between ultra-thin SnS<sub>2</sub> rich in active sites and individual dispersed Pt nanoclusters can significantly reduce the reaction barrier and further accelerate HER reaction kinetics. Hence, SnS<sub>2</sub>-Pt-3 exhibits a low overpotential of 210 mV at the current density of 10 mA cm<sup>−2</sup>. It is worth noting that SnS<sub>2</sub>-Pt-3 has a small Tafel slope (126 mV dec<sup>−1</sup>) in 0.5 M H<sub>2</sub>SO<sub>4</sub>, as well as stability. This work provides a new option for the application of TMDs materials in efficient hydrogen evolution reaction. Moreover, this method can be easily extended to other catalysts with desired two-dimensional materials.
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