Hierarchical sulfur and nitrogen co-doped carbon nanocages as efficient bifunctional oxygen electrocatalysts for rechargeable Zn-air battery

作     者：Hao Fan Yu Wang Fujie Gao Longqi Yang Meng Liu Xiao Du Peng Wang Lijun Yang Qiang Wu Xizhang Wang Zheng Hu Hao Fan;Yu Wang;Fujie Gao;Longqi Yang;Meng Liu;Xiao Du;Peng Wang;Lijun Yang;Qiang Wu;Xizhang Wang;Zheng Hu

作者机构：Key Laboratory of Mesoscopic Chemistry of MOE and Collaborative Innovation Center of Chemistry for Life SciencesJiangsu Provincial Laboratory for NanotechnologySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023.JiangsuChina National Laboratory of Solid State MicrostructuresNanjing UniversityNanjing 210023JiangsuChina College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023JiangsuChina 

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

年 卷 期：2019年第28卷第7期

页      面：64-71页

核心收录：

学科分类：0820[工学-石油与天然气工程] 0808[工学-电气工程] 07[理学] 0817[工学-化学工程与技术] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financial support from the National Natural Science Foundation of China (21773111, 21473089, 21573107 and 51571110) the National Key Research and Development Program of China (2017YFA0206503, 2018YFA0209103) Priority Academic Program Development of Jiangsu Higher Education Institutions, Fundamental Research Funds for the Central Universities the program B for outstanding PhD candidate of Nanjing University (201702B049) 

主　　题：3D hierarchical Carbon nanocages S,N co-doping Bifunctional electrocatalysis Zn-air battery 

摘      要：Exploring inexpensive and efficient bifunctional electrocatalysts for oxygen reduction reaction(ORR) and oxygen evolution reaction(OER) is critical for rechargeable metal-air batteries. Herein, we report a new 3D hierarchical sulfur and nitrogen co-doped carbon nanocages(hSNCNC) as a promising bifunctional oxygen electrocatalyst by an in-situ MgO template method with pyridine and thiophene as the mixed precursor. The as-prepared h SNCNC exhibits a positive half-wave potential of 0.792 V(vs. reversible hydrogen electrode, RHE) for ORR, and a low operating potential of 1.640 V at a 10 mA cm-2 current density for OER. The reversible oxygen electrode index is 0.847 V, far superior to commercial Pt/C and IrO2,which reaches the top level of the reported bifunctional catalysts. Consequently, the hSNCNC as air cathodes in an assembled Zn-air battery features low charge/discharge overpotential and long lifetime. The remarkable properties arises from the introduced multiple heteroatom dopants and stable 3D hierarchical structure with multi-scale pores, which provides the abundant uniform high-active S and N species and efficient charge transfer as well as mass transportation. These results demonstrate the potential strategy in developing suitable carbon-based bi-/multi-functional catalysts to enable the next generation of the rechargeable metal-air batteries.