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

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

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High-performance bifunctional oxygen electro-catalysts that simultaneously boost the sluggish oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)need to be developed for advanced rechargeable Zn-air battery applications.In this work,a zeolitic imidazolate framework(ZIF)-phase conversion associated with a sub-sequent thermal fixing strategy was developed to fabri-cate bimetallic CoFe single atoms/clusters embedded in N-doped carbon(denoted as CoFe-N-C)nanorods,which can serve as efficient bifunctional ORR/OER electrocata-lysts.Microstructural observation and X-ray absorption spectroscopy analysis confirm the co-existence of highly active Co/Fe-Nx 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 sig-nificantly 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 of 200.7 mW·cm-2 and robust cycling stability of up to 200 h,corresponding to 1200 discharge-charge cycles.

Bimetallic electrocatalystSingle-atom catalystsOxygen reduction reactionOxygen evolution reactionZn-air batteries

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

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Sauvage Laboratory for Smart Materials,School of Materials Science and Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China

School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China

Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong 999077,China

Peng Cheng Laboratory,Shenzhen 518055,China

MOE Key Laboratory of Micro-Systems and Micro-Structures Manufacturing,Harbin Institute of Technology,Harbin 150080,China

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2024

10.1007/s12598-024-02676-y

稀有金属(英文版)
中国有色金属学会

稀有金属(英文版)

CSTPCDEI
影响因子：0.801
ISSN：1001-0521
年,卷(期)：2024.43(11)