CeO2 quantum dots doped Ni-Co hydroxide nanosheets for ultrahigh energy density asymmetric supercapacitors |
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| Institution: | 1. Key Laboratory of Advanced Functional Materials of Nanjing, School of Environmental Science, Nanjing Xiaozhuang University, Nanjing 211171, China;2. School of Chemistry and Chemical Engineering, Institute for Innovative Materials and Energy, Yangzhou University, Yangzhou 225009, China;1. Jiangsu Key Laboratory for Environment Functional Materials, Suzhou University of Science and Technology, Suzhou 215009, China;2. School of Chemistry, Biology and Materials Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;3. Department of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;4. School of Mechanical Engineering, Changzhou University, Changzhou 213164, China;1. Faculty of Chemistry, Polymer Chemistry Laboratory, Department of Organic Chemistry, University of Mazandaran, Babolsar, P.O. Box 47416-95447, Iran;2. Malek-Ashtar University of Technology, Department of Chemistry and Chemical Engineering, P.O. Box 16765-3454, Tehran, Iran;1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, 150001, PR China;2. College of Materials Science and Chemical Engineering, Harbin Engineering University, 150001, PR China;3. College of Science, Heihe University, Heihe 164300, PR China;4. Institute of Advanced Marine Materials, Harbin Engineering University, 150001, PR China |
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| Abstract: | By integrating the merits of lanthanide elements and quantum dots, we firstly design CeO2 quantum dots doped Ni-Co hydroxide nanosheet via a controllable synthetic strategy, which exhibits a large specific capacitance (1370.7 F/g at 1.0 A/g) and a good cyclic stability (90.6% retention after 4000 cycles). Moreover, we assemble an aqueous asymmetric supercapacitor with the obtained material, which has an extremely high energy density (108.9 Wh/kg at 378 W/kg) and outstanding cycle stability (retaining 88.1% capacitance at 2.0 A/g after 4000 cycles). |
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| Keywords: | Asymmetric supercapacitor Electrochemical energy storage Quantum dots Transition metal hydroxides Rare earth |
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