Bimetallic active site nuclear‐shell heterostructure enables efficient dual‐functional electrocatalysis in alkaline media
Yu Cheng, Xi Zhou, Qinmin Pan, Lifang Zhang, Yufeng Cao, Tao Qian
Abstract
Abstract Hydrogen, as a green and clean next‐generation fuel, is a key to achieving the goal of carbon neutrality. Constructing an electrocatalyst with bifunctional hydrogen evolution and oxygen evolution activity in the same electrolyte is a key technology for producing hydrogen via water splitting. Herein, a bimetallic active site catalyst, which possessed an edge‐riched MoS 2 nanoflakes array vertically growing on cubic CoS 2 , forming a nuclear‐shell heterogeneous configuration, termed CSC‐MoS 2 @CoS 2 . was reported The optimal CSC‐MoS 2 @CoS 2 ‐24 possessed good dual‐functional electrocatalytic activity (hydrogen evolution (HER), 10 mA·cm −2 @241.5 mV and oxygen evolution (OER), 10 mA·cm −2 @350 mV). Especially, CSC‐MoS 2 @CoS 2 ‐24 exhibited an extremely high mass activity for HER, and only required an overpotential of ~ 550 mV when reaching a large current density of 1422 mA·mg −1 , which was 20.6‐fold that of the bulk CoS 2 (69 mA·mg −1 ), as well as exhibiting stability of up to 100 h. The good electrocatalytic performance was attributed to the nuclear‐shell heterostructure of MoS 2 @CoS 2 hybrid could bring critical synergies, improving efficient mass transfer and electron transfer processes between CoS 2 and MoS 2 , which collaboratively promoted the electrocatalytic kinetics. It is foreseeable that the method proposed in this work will have guiding value for the preparation of dual‐functional electrocatalysts with multi‐interface heterostructures by assembling layered sulfides on cubic sulfides.