In
this work, N, P dual-doped molybdenum carbide/porous carbon
fiber composites were simply fabricated through electrospinning technology,
followed by pyrolysis. The obtained samples were composed of N, P-doped
MoC, Mo2C, and porous carbon fibers. Compared with each
moiety, the composited samples have exhibited greatly improved electrocatalytic
activities for hydrogen evolution reaction (HER). As a result, the
optimized MoxC-NPC-1.0-800 catalyst exhibits only 125/71
mV of overpotential at 10 mA·cm–2 and superior
stability in 0.5 M H2SO4 and 1.0 M KOH, respectively,
which outperforms most of the reported analogous catalysts. In addition,
a theoretical simulation has confirmed that N, P doping can significantly
reduce |ΔG
H
*| for hydrogen
adsorption of MoC and Mo2C and consequently enhance the
electrocatalytic activity of the catalysts for HER greatly. This work
provides a convenient avenue for fabricating highly efficient composite
electrocatalysts of nonmetallic element doped metallic carbide and
graphitic carbon.
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