Simultaneously morphology and phase controlled synthesis of cobalt manganese hydroxides/reduced graphene oxide for high performance supercapacitor electrodes |
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| Affiliation: | 1. College of Science, Hebei University of Science and Technology, Shijiazhuang, 050018, China;2. Key Laboratory for Robot and Intelligent Technology of Shandong Province, Shandong University of Science and Technology, Qingdao, 266590, China;1. Energy Materials Laboratory (EML), School of Sciences and Engineering, The American University in Cairo, New Cairo, 11835, Egypt;2. Physical Chemistry Department, National Research Centre, Dokki, Giza, Egypt;1. Energy Materials Laboratory, School of Sciences and Engineering, The American University in Cairo, 11835, New Cairo, Egypt;2. Department of Analysis and Evaluation, Egyptian Petroleum Research Institute, 11727, Cairo, Egypt;3. Chemistry Department, Faculty of Science, Cairo University, 12613, Giza, Egypt |
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| Abstract: | Cobalt manganese hydroxides with well-defined nanowire morphology (CoMn-HW) is scalable fabricated by adjusting solution contents, Mn/Co ratio and alkaline species. To further improve the conductivity of CoMn-HW, GO is introduced during fabrication process and reduced to rGO according to the high temperature and alkali atmosphere. By optimizing the adding mass of rGO, CoMn-HW/rGO with sandwiched like structure is successfully synthesized for supercapacitor electrode. The composite delivers a high specific capacitance of 784 F g?1 at current density of 0.5 A g?1, good rate capability (84.2% capacitance retention after current density increase 10 times). Moreover, an asymmetric supercapacitor with CoMn-HW/rGO10 as the positive electrode and active carbon as the negative electrode, is assembled and delivers a maximum energy density of 38.3 Wh kg?1 and power density of 8000 W kg?1, representing its potential in energy storage and conversion systems. |
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| Keywords: | Supercapacitor Cobalt manganese hydroxides rGO Composite Controllable synthesis |
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