Encapsulation of bimetallic phosphides into graphitized carbon for pH-universal hydrogen evolution reaction  

作　　者：Jian Zhou Yibo Dou Tao He Xiang-Jing Kong Lin-Hua Xie Jian-Rong Li 

机构地区：[1]Beijing Key Laboratory for Green Catalysis and Separation,Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China

出　　处：《Journal of Energy Chemistry》2021年第12期253-261,I0005,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (nos. 21771012, 22038001, 51621003)。

摘　　要：Exploring nonprecious electrocatalysts for water splitting with high efficiency and durability is critically important.Herein,bimetallic phosphides are encapsulated into graphitized carbon to construct a C@NiCoP composite nanoarray using bimetallic metal-organic framework(MOF) as a self-sacrificial template.The resulting C@NiCoP exhibits superior performance for pH-universal electrocatalytic hydrogen evolution reaction(HER),particularly representing a low overpotential of 46.3 mV at 10 mA cm^(-2) and Tafel slope of 44.1 mV dec^(-1) in alkaline media.The structural characterizations combined with theoretical calculation demonstrate that tailored electronic structure from bimetal atoms and the synergistic effect with graphitized carbon layer could jointly optimize the adsorption ability of hydrogen on active sites in HER process,and enhance the electrical conductivity as well.In addition,the carbon layer served as a protecting shell also prevents highly dispersed NiCoP components from agglomeration and/or loss in harsh media,finally improving the durability.This work thus provides a new insight into optimizing activity and stability of pH-universal electrocatalysts by the nanostructural design and electronic structure modulation.

关 键 词：Bimetallic phosphides Graphitized carbon Hydrogen evolution reaction MOF template Electronic structure 

分 类 号：TQ116.2[化学工程—无机化工] TQ426