Co-precipitation synthesis of nickel cobalt hexacyanoferrate for binder-free high-performance supercapacitor electrodes |
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| Affiliation: | 1. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, PR China;2. Mianyang No. 1 Middle School, Mianyang, 621000, PR China;3. Mianyang Kingtiger New Energy Technology Co. Ltd., Mianyang, 621000, PR China;4. Center of Analysis and Test, Southwest University of Science and Technology, Mianyang, 621010, PR China;5. Sichuan Changhong New Energy Technology Co. Ltd., Mianyang, 621000, PR China;6. Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang, 621010, PR China;1. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, College of Life Sciences and Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China;2. School of Pharmacy, Hubei University of Science and Technology, Xianning, Hubei 437100, China;3. State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China;1. State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Lab of Graphene (NPU), Xi’an 710072, China;2. Department of Mechanical Engineering, University of Delaware, Newark, DE19716, USA;1. Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Material Science and Chemical Engineering, Harbin Engineering University, Harbin, China;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;3. College of Science, Northeast Agricultural University, Harbin 150030, China |
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| Abstract: | Prussian blue analogue with a typical metal-organic framework has been widely used as an electrode material in supercapacitor. In this work, nickel cobalt hexacyanoferrate (Ni2CoHCF) was grown on nickel foam directly using a simple co-precipitation method. The as-prepared Ni2CoHCF was tested by transmission electron microscope, scanning electron microscope, X-ray diffraction and X-ray electron energy spectrum. The results showed that Ni2CoHCF has a unique open face-centered cubic structure. The Ni2CoHCF was used to set an asymmetric supercapacitor directly. A series of electrochemical tests showed that Ni2CoHCF had an excellent electrochemical performance. The specific capacitance of the supercapacitor was 585 C g?1 (1300.0 F g?1, 162.5 mAh g?1) at the current density of 0.5 A g?1. After 2000 cycles, it still maintained 85.57% of its initial specific capacitance at the current density of 10 A g?1. The energy density was 30.59 Wh kg?1 at the power density of 378.7 W kg?1. The results show that the supercapacitor constructed by Ni2CoHCF as an electrode material has high-current charge-discharge capacity, high energy density and long cycle life. |
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| Keywords: | Binder-free Supercapacitor Co-precipitation Hexacyanoferrate Metal-organic framework |
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