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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 2 C nanoparticles (Mo 2 C/NPC) was synthesized by a novel method with high BET surface area of 1380 m 2  g −1  using KOH to activate carbon composite materials. The KOH plays a key role in etching out MoS 2  to produce Mo precursor; simultaneously, it corrodes carbon to form porous structure and produce reducing gas such as H 2  and CO. The resulting Mo 2 C/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.   Supplementary material   Supplementary information  accompanies this paper at 10.1186/s11671-019-3147-z.

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