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A highly active and stable electrocatalyst (MoS x @Mo 2 C) for hydrogen evolution is developed via the sulfur decoration of molybdenum carbide for the first time. Although the decoration of sulfur reduced the electrochemically active surface area and slightly enlarged the impedance resistance of Mo 2 C substrates, the turnover frequency was remarkably enhanced, resulting in a great improvement in the final hydrogen evolution reaction activity. More importantly, there is a synergistic effect between MoS x and Mo 2 C, making the MoS x @Mo 2 C catalyst exhibit an excellent activity with a small Tafel slope of 44 mV dec −1 , which is among the best records for Mo 2 C-based catalysts.

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