Construction of MnO2 nanosheets@graphenated carbon nanotube networks core-shell heterostructure on 316L stainless steel as binder-free supercapacitor electrodes |
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| Affiliation: | 1. College of Architecture and Material Engineering, Institute for the Application of Green Energy Materials, Hubei University of Education, Gaoxin Road 129, Wuhan 430205, China;2. State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China;3. Institute of Materials Research and Engineering, Hubei University of Education, Gaoxin Road 129, Wuhan 430205, China;4. School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205, China;5. Wuhan Metro Group Co., Ltd., Wuhan 430030, China;1. Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, China;2. College of Physics, Sichuan University, 610065, Chengdu, China;3. Science and Technology on Surface Physics and Chemistry Laboratory, P. O. Box 9071-35, Jiangyou, 621907, China;4. College of Mathematics, Sichuan University, 610065, Chengdu, China;1. School of Physics and Electronic Engineering, Taishan University, Taian, 271000, PR China;2. School of Physics and Electronic Engineering, Linyi University, Linyi, 276005, PR China;1. Center for Energy Materials Research, Korea Institute of Science and Technology, Seoul, 02792, Republic of Korea;2. Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea;3. Advanced Metals Division, Korea Institute of Materials Science, Changwon, 51508, Republic of Korea;4. Advanced Materials Engineering, University of Science and Technology, Daejeon, 34113, Republic of Korea;1. Department of Polymeric Materials, School of Materials Science and Engineering, Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 200092, PR China;2. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology & School of Physics Science and Engineering, Tongji University, Shanghai 200092, PR China |
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| Abstract: | Carbon nanotubes are regarded as typical and promising electrode materials in supercapacitors. However, small specific capacitance of carbon nanotubes restricts the practical application in high energy density devices. Herein, MnO2 nanosheets@graphenated carbon nanotube networks are synthesized directly on 316L stainless steel as binder-free electrodes for high-performance supercapacitors. Graphenated carbon nanotube networks are grown in-situ on stainless steel by chemical vapor deposition method followed by annealing treatment. Subsequently, MnO2 nanosheets are uniformly deposited on graphenated carbon nanotube networks to construct core-shell heterostructure based on the facile hydrothermal reaction using KMnO4 as the precursor. Core carbon nanotube networks can offer a stable structural backbone and shell MnO2 nanosheets can shorten diffusion paths of ions. The MnO2 nanosheets@graphenated carbon nanotube networks exhibit a high specific capacitance of 575.4 F g−1 (areal capacitance of 274 mF cm−2) at the current density of 0.5 mA cm−2 and good cycling stability (93% of capacity retention after 6000 cycles), due to the synergistic effects between pseudocapacitive MnO2 nanosheets and conductive carbon nanotube networks. The developed synthetic strategy offers design guidelines for the construction of advanced binder-free electrodes for high-performance supercapacitors. |
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| Keywords: | Carbon nanotube networks Supercapacitors Core-shell Binder-free |
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