Herein, we choose the waste walnut shell as the carbon source, and ammonium heptamolybdate as the molybdenum source to prepare the β-MoC catalyst supported on carbon matrix (MoC@C) by the calcination method for hydrogen evolution reaction (HER). The open pores in the porous MoC nanoparticle clusters can facilitate electrolyte permeation and hydrogen molecules release as well as the carbon matrix can enhance the conductivity. As a result, the optimal MoC exhibits an efficient HER performance, with an overpotential of 140 mV at 10 mA cm and a Tafel slope of 63 mV dec as well as excellent electrochemical stability. The strategy changing waste walnut shell into the effective catalysts sets an example for the searching and designing rational energy materials.
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