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Enhancing Electrocatalytic Activity for Hydrogen Evolution by Strongly Coupled Molybdenum Nitride@Nitrogen-Doped Carbon Porous Nano-Octahedrons
journal contribution
posted on 2017-04-10, 00:00 authored by Yanping Zhu, Gao Chen, Xiaomin Xu, Guangming Yang, Meilin Liu, Zongping ShaoDeveloping
highly efficient and affordable noble-metal-free catalysts
toward the hydrogen evolution reaction (HER) is an important step
toward the economical production of hydrogen. As a nonprecious-metal
catalyst for the HER, molybdenum nitride (MoN) has excellent corrosion
resistance and high electrical conductivity, but its catalytic activity
is still inadequate. Here we report our findings in dramatically enhancing
the HER activity of MoN by creating porous MoN@nitrogen-doped carbon
(MoN-NC) nano-octahedrons derived from metal–organic frameworks
(MOFs). The composite catalyst displays remarkably high catalytic
activity, demonstrating a low overpotential of 62 mV at a current
density of 10 mA cm–2 (η10), a
small Tafel slope of 54 mV dec–1, and a large exchange
current density of 0.778 mA cm–2 while maintaining
good stability. The enhancement in catalytic properties is attributed
to the unique nanostructure of the MoN, the high porosity of the electrode,
and the synergistic effect between the MoN and the nitrogen-doped
carbon substrate. The performances are among the best ever reported
for nonprecious-metal-based electrocatalysts (comparable to those
of a 20% Pt/C commercial catalyst), making the porous MoN-NC nano-octahedrons
some of the most active and acid-stable electrocatalysts for the HER.
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corrosion resistancedensityMoN-NC nano-octahedronsTafel slopeacid-stable electrocatalystsHER activityhydrogen evolution reactionmolybdenum nitrideMOF62 mVcmnoble-metal-free catalystsmAcatalyst displaysnonprecious-metal-based electrocatalystsHydrogen EvolutionEnhancing Electrocatalytic Activitynonprecious-metal catalystnitrogen-doped carbon substrate
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