Preparation of scale-like nickel cobaltite nanosheets assembled on nitrogen-doped reduced graphene oxide for high-performance supercapacitors |
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| Affiliation: | 1. Department of Applied Chemistry, School of Science, Xi’an Jiaotong University, Xi’an 710049, China;2. MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China;3. The Center of Nanomaterials for Renewable Energy, Xi’an Jiaotong University, Xi’an 710049, China;1. Department of Materials Science and Engineering, State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, PR China;2. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, PR China;3. Shun Hing Institute of Advanced Engineering, The Chinese University of Hong Kong, Hong Kong, China;1. School of Chemical Engineering, Yeungnam University, Gyeongsan, Gyeongbuk, 712-749, Republic of Korea;2. Department of Chemistry, Nha Trang University, 2 Nguyen Dinh Chieu, Nha Trang, Viet Nam;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Luoshi Road 122, Wuhan 430070, PR China;2. Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;1. Technische Universität Chemnitz, Institut für Chemie, AG Elektrochemie, D-09107 Chemnitz, Germany;2. Centro de Investigación en Nanociencia y Nanotecnología, CIN2/ICN2 (CSIC-ICN), Campus UAB, 08193 Bellaterra, Barcelona, Spain;3. MATGAS Research Center, Campus UAB, 08193 Bellaterra, Barcelona, Spain;4. Nano Material and Device Laboratory, Department of Applied Physics, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur 440 010, M.S., India |
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| Abstract: | Ultrathin scale-like nickel cobaltite (NiCo2O4) nanosheets supported on nitrogen-doped reduced graphene oxide (N-rGO) are successfully synthesized through a facile co-precipitation of Ni2+ and Co2+ in the presence of sodium citrate and hexamethylenetetramine and subsequent calcination treatment. The composition and morphology of NiCo2O4 nanosheets@nitrogen-doped reduced graphene oxide (denoted as NiCo2O4 NSs@N-rGO) were characterized by Scanning electron microscope, Transmission electron microscope, X-ray diffraction, Raman spectra, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller and thermogravimetric analysis. The thickness of NiCo2O4 nanosheets anchored on the reduced graphene oxide is around 4 nm. The capacitance of NiCo2O4 NSs@N-rGO is evaluated by cyclic voltammogram and galvanostatic charge/discharge with the result that the NiCo2O4 NSs@N-rGO could deliver a specific capacitance of 1540 F g−1 after 1000 cycles at 10 A g−1. |
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