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

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.