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Nitrogen-Doped Porous Carbon Nanosheets Strongly Coupled with Mo2C Nanoparticles for Efficient Electrocatalytic Hydrogen Evolution.


ABSTRACT: Exploring earth-abundant and noble metal-free catalysts for water electrolysis is pivotal in renewable hydrogen production. Herein, a highly active electrocatalyst of nitrogen-doped porous carbon nanosheets coupled with Mo2C nanoparticles (Mo2C/NPC) was synthesized by a novel method with high BET surface area of 1380 m2 g-1 using KOH to activate carbon composite materials. The KOH plays a key role in etching out MoS2 to produce Mo precursor; simultaneously, it corrodes carbon to form porous structure and produce reducing gas such as H2 and CO. The resulting Mo2C/NPC hybrid demonstrated superior HER activity in acid solution, with the overpotential of 166 mV at current density of 10 mA cm-2, onset overpotential of 93 mV, Tafel slope of 68 mV dec-1, and remarkable long-term cycling stability. The present strategy may provide a promising strategy to fabricate other metal carbide/carbon hybrids for energy conversion and storage.

SUBMITTER: Lei Y 

PROVIDER: S-EPMC6805847 | biostudies-other | 2019 Oct

REPOSITORIES: biostudies-other

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Nitrogen-Doped Porous Carbon Nanosheets Strongly Coupled with Mo<sub>2</sub>C Nanoparticles for Efficient Electrocatalytic Hydrogen Evolution.

Lei Ying Y   Yang Yong Y   Liu Yudong Y   Zhu Yaxing Y   Jia Mengmeng M   Zhang Yang Y   Zhang Ke K   Yu Aifang A   Liu Juan J   Zhai Junyi J  

Nanoscale research letters 20191022 1


Exploring earth-abundant and noble metal-free catalysts for water electrolysis is pivotal in renewable hydrogen production. Herein, a highly active electrocatalyst of nitrogen-doped porous carbon nanosheets coupled with Mo<sub>2</sub>C nanoparticles (Mo<sub>2</sub>C/NPC) was synthesized by a novel method with high BET surface area of 1380 m<sup>2</sup> g<sup>-1</sup> using KOH to activate carbon composite materials. The KOH plays a key role in etching out MoS<sub>2</sub> to produce Mo precursor;  ...[more]

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