ZIF-derived N-doped carbon nanorods supporting bimetallic CoFe single-atoms/nanoclusters as bifunctional oxygen electrocatalysts for stable Zn-air batteries  

作　　者：Hong-Shuang Fan Fei-Xiang Ma Zi-Hao Liu Wen-Hui Wang Zheng-Qi Liu Xiong-Yi Liang Yue Du Yang-Yang Li Liang Zhen Cheng-Yan Xu 

机构地区：[1]Sauvage Laboratory for Smart Materials,School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [2]School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China [3]Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong 999077,China [4]Peng Cheng Laboratory,Shenzhen 518055,China [5]MOE Key Laboratory of Micro-Systems and Micro-Structures Manufacturing,Harbin Institute of Technology,Harbin 150080,China

出　　处：《Rare Metals》2024年第11期5769-5780,共12页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.52302233);Shenzhen Science and Technology Innovation Committee(No.JCYJ20200109113212238);Guangdong Basic and Applied Basic Research Foundation(No.2021A1515111154);Talent Recruitment Project of Guangdong Province(No.2021QN02C900)。

摘　　要：High-performance bifunctional oxygen electrocatalysts that simultaneously boost the sluggish oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)need to be developed for advanced rechargeable Znair battery applications.In this work,a zeolitic imidazolate framework(ZIF)-phase conversion associated with a subsequent thermal fixing strategy was developed to fabricate bimetallic CoFe single atoms/clusters embedded in N-doped carbon(denoted as CoFe-N-C)nanorods,which can serve as efficient bifunctional ORR/OER electrocatalysts.Microstructural observation and X-ray absorption spectroscopy analysis confirm the co-existence of highly active Co/Fe-N_(x) dual sites and CoFe alloy nanoclusters.X-ray photoelectron spectroscopy(XPS)results prove that implanting secondary Fe atoms into Co-N-C matrix nanorods can induce electronic redistribution of atomic Co/Fe active sites and generate synergistic effects,which would optimize the adsorption energy of the reaction intermediates and thus enhance the bifunctional ORR/OER activity.The bimetallic CoFe-N-C nanorods exhibit significantly enhanced bifunctional ORR/OER activity and stability than the monometallic Co/Fe-N-C nanorods in alkaline electrolytes in terms of a very positive half-wave potential of 0.90 V(vs.reversible hydrogen electrode(RHE))for ORR,and an overpotential of 440 mV to reach current density of 10 mA·cm^(-2)for OER,yielding a small overpotential gap of 0.77 V.Furthermore,the rechargeable Zn-air batteries using bimetallic CoFe-N-C nanorods as air-cathode catalyst demonstrates peak power density of200.7 mW·cm^(-2)and robust cycling stability of up to200 h,corresponding to 1200 discharge-charge cycles.

关 键 词：Bimetallic electrocatalyst Single-atom catalysts Oxygen reduction reaction Oxygen evolution reaction Zn-air batteries 

分 类 号：TM911.41[电气工程—电力电子与电力传动] O643.36[理学—物理化学]