A hint from phosphine complex:Theπback-bonding in cobalt-phosphorene composite enables enhanced electrocatalytic performance  

作　　者：Xingyun Li Liangping Xiao Hao Wang Jingting Song Qingchi Xu Meidan Ye Jun Xu 

机构地区：[1]Shenzhen Research Institute of Xiamen University,Shenzhen,518057,China [2]Department of Physics,Research Institute for Biomimetics and Soft Matter,Fujian Provincial Key Laboratory for Soft Functional Materials,Xiamen University,Xiamen,361005,Fujian,China [3]Jiujiang Research Institute of Xiamen University,Jiujiang,332105,China [4]Department of Chemistry,National University of Singapore,3 Science Drive 3,Singapore,117543,Singapore

出　　处：《Progress in Natural Science:Materials International》2023年第1期100-107,共8页自然科学进展·国际材料（英文版）

基　　金：supported by the Shenzhen Fundamental Research Programs (JCYJ20190809161013453,JCYJ20190809161407424);the Fundamental Research Funds for the Central Universities (20720220031);the 111 Project (B16029).

摘　　要：Regulating the electronic structure of the metal electrocatalyst is fundamental for its performance optimizing.The electronic states of the active metal centers are highly dependent on their coordination environment,especially when bonding is formed.Theπback-bonding can induce great electron density redistribution around metals,yet it is barely applied in electrocatalyst design.Herein we electrodeposited metallic cobalt on black phosphorus(BP)nanosheets,forming BP-Co with a uniqueπback-bonding on the interfaces.The BP-Co exhibited high electro-catalytic activity and stability for hydrogen evolution reaction in alkaline electrolyte.The electrochemical and spectroscopic characterizations demonstrated that the BP acted asσdonor andπacceptor to coordinate with electron-rich metallic Co,similar to the phosphine complex.The directionalσbond strengthen the relationship between BP and Co,while the non-directionalπbond accelerated the in-plane electron transfer.Theπback donation also decreased the oxophilicity of Co to make BP-Co resist the poison from oxygen species.This study can intrigue new thinking prospective for the electrocatalyst design.

关 键 词：Black phosphorus Pi back-bonding ELECTROCATALYST ELECTRODEPOSITION Electronic structure 

分 类 号：O643.36[理学—物理化学]