Abstract
Transition carbides have been studied as one of the most promising non-precious-metal catalysts for hydrogen evolution reaction (HER) due to analogous electronic structure to precious metals. Herein, molybdenum carbide nanoparticles supported on nitrogen-doped carbon (Mo2C/NC) have been successfully synthesized through a facile and environmentally-friendly hydrothermal method. The nitrogen content is adjusted by varying the molar ratio of glucose (G) and glucosamine hydrochloride (GH). With an optimal G/GH ratio of 0.6, Mo2C/NC-0.6 nanoparticles exhibit a low onset reduction potential of 95mV with a Tafel slope of 79.2mVdec−1, an overpotential of 168mV at cathodic current density of 10mAcm−2 and good stability in acidic media. The high electrocatalytic activity of Mo2C/NC-0.6 can be attributed to high specific surface area, synergistic effect between Mo2C and N species, and the conductive N-doped carbonaceous matrix. This study may provide a promising strategy for synthesizing efficient water splitting catalysts with great electrocatalytic activities.
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