Phase-engineered molybdenum carbide embedded in nitrogen-doped carbon nanofiber composites for enhanced hydrogen evolution

초록

Herein, heterostructured Mo2C-MoC nanoparticles embedded in nitrogen-doped carbon nanofibers (Mo2C-MoC/NCNF) were synthesized via a facile electrospinning and annealing process. This method enables the straightforward fabrication of one-dimensional catalysts while allowing phase control of molybdenum carbide by simply adjusting the annealing temperature. The resulting Mo2C-MoC/NCNF exhibits excellent HER performance in 1 M KOH, with low overpotentials of 106.8 and 169.1 mV at current densities of 10 and 50 mA cm(-2), respectively, along with outstanding stability over 24 h. The enhanced HER activity is attributed to the synergistic effect between the heterostructured Mo2C-MoC, which serves as an active site by modulating hydrogen binding energy, and the NCNF, which provides a large surface area and high electrical conductivity.

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