Honeycomb‐like MoCo alloy on 3D nitrogen‐doped porous graphene for efficient hydrogen evolution reaction
Linping Wang, Kuang Li, Hualong Ding, Le Xu, Chen Huang, Jiao–Jiao Zhou, Congtao Wen, Peilin Zhang, Weiwei Wang, Luyang Chen
Abstract
Abstract An efficient electrocatalyst is indispensable to significantly reduce energy consumption and accelerate the conversion efficiency of water splitting. In this work, the honeycomb‐like porous MoCo alloy on nitrogen‐doped three‐dimensional (3D) porous graphene substrate (Mo 0.3 Co 0.7 @NPG) has been synthesized from the annealing of layered double hydroxide (MoCo‐LDH@NPG). Especially, the Mo 0.3 Co 0.7 @NPG exhibits low hydrogen evolution overpotential of 75 mV (10 mA·cm –2 ) and a Tafel slope of 69.9 mV·dec –1 , which can be attributed to highly conductive NPG substrate, the unique nanostructure and the synergistic effect of Mo and Co. Moreover, the Mo 0.3 Co 0.7 @NPG can maintain the original morphology and high catalytic activity after 50‐h stability test. This work proposes a general strategy to synthesize a multi‐element alloy on conductive substrates with high porosity for electrocatalytic reaction.