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Heteronanowires of MoC-Mo2C as efficient electrocatalysts for hydrogen evolution reaction.


ABSTRACT: Exploring efficient noble-metal free electrocatalysts for the hydrogen evolution reaction (HER) is one of the most promising pathways for facing the energy crisis. Herein, MoC-Mo2C heteronanowires composed of well-defined nanoparticles were accomplished via controlled carbonization, showing excellent HER activity, fast kinetic metrics and outstanding stability in both acid and basic electrolytes. In particular, the optimal one consisting of 31.4 wt% MoC displayed a low overpotential (η10 = 126 and 120 mV for reaching a current density of -10 mA cm-2), a small Tafel slope (43 and 42 mV dec-1) and a low onset overpotential (38 and 33 mV) in 0.5 M H2SO4 and 1.0 M KOH, respectively. Such prominent performance, outperforming most of the current noble-metal free electrocatalysts, was ascribed to the carbide surface with an optimized electron density, and the consequently facilitated HER kinetics. This work elucidates a feasible way toward efficient electrocatalysts via heteronanostructure engineering, shedding some light on the exploration and optimization of catalysts in energy chemistry.

SUBMITTER: Lin H 

PROVIDER: S-EPMC6007147 | biostudies-literature | 2016 May

REPOSITORIES: biostudies-literature

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Heteronanowires of MoC-Mo<sub>2</sub>C as efficient electrocatalysts for hydrogen evolution reaction.

Lin Huanlei H   Shi Zhangping Z   He Sina S   Yu Xiang X   Wang Sinong S   Gao Qingsheng Q   Tang Yi Y  

Chemical science 20160212 5


Exploring efficient noble-metal free electrocatalysts for the hydrogen evolution reaction (HER) is one of the most promising pathways for facing the energy crisis. Herein, MoC-Mo<sub>2</sub>C heteronanowires composed of well-defined nanoparticles were accomplished <i>via</i> controlled carbonization, showing excellent HER activity, fast kinetic metrics and outstanding stability in both acid and basic electrolytes. In particular, the optimal one consisting of 31.4 wt% MoC displayed a low overpote  ...[more]

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