Engineering the morphology and electronic structure of atomic cobalt-nitrogen-carbon catalyst with highly accessible active sites for enhanced oxygen reduction

作     者：Zhijun Li Leipeng Leng Siqi Ji Mingyang Zhang Hongxue Liu Jincheng Gao Jiangwei Zhang J.Hugh Horton Qian Xu Junfa Zhu Zhijun Li;Leipeng Leng;Siqi Ji;Mingyang Zhang;Hongxue Liu;Jincheng Gao;Jiangwei Zhang;J.Hugh Horton;Qian Xu;Junfa Zhu

作者机构：Joint International Research Laboratory of Advanced Chemical Catalytic Materials&Surface ScienceCollege of Chemistry and Chemical EngineeringNortheast Petroleum UniversityDaqing 163318HeilongjiangChina Dalian National Laboratory for Clean Energy&State Key Laboratory of CatalysisDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina Department of ChemistryQueen0s UniversityKingstonOntario K7L 3N6Canada National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230029AnhuiChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第10期

页      面：469-477,I0012页

核心收录：

学科分类：081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the Postdoctoral Research Foundation of China(2019M661247,2020T130091) Scientific Research Foundation for Returned Scholars of Heilongjiang Province of China(719900091) Program for Overseas Talents Introduction of Northeast Petroleum University(15041260303) Heilongjiang Touyan Innovation Team Program 

主　　题：Single atom electrocatalyst Non-precious metal Coordination environment Oxygen reduction reaction Catalytic activity Zn-air battery 

摘      要：The stabilization of non-precious metals as isolated active sites with high loading density over nitrogendoped carbon materials is essential for realizing the industrial application of single atom ***,achieving high loading of single cobalt active sites with greatly enhanced oxygen reduction reaction(ORR)activity and stability remains ***,an efficient approach was described to create a single atom cobalt electrocatalyst(Co SAs/NC)which possesses enhanced mesoporosity and specific surface area that greatly favor the mass transportation and exposure of accessible active *** electronic structure of the catalyst by the strong metal-support interaction has been elucidated through experimental characterizations and theoretical *** to dramatically enhanced mass transport and electron transfer endowed by morphology and electronic structure engineering,Co SAs/NC exhibits remarkable ORR performance with excellent activity(onset and half-wave potentials of 1.04 V(RHE)and 0.90 V(RHE),Tafel slope of 69.8 mV dec^(-1)and J_(k) of 18.8 mA cm^(-2)at 0.85 V)and stability(7 mV activity decay after 10,000 cycles).In additio n,the catalyst demonstrates great promise as an alternative to traditional Pt/C catalyst in zinc-air batteries while maintaining high performance in terms of high specific capacity of(796.1 mAh/g_(Zn)),power density(175.4 mW/cm^(2)),and long-term cycling stability(140 h).This study presents a facile approach to design SACs with highly accessible active sites for electrochemical transformations.