Design of high-performance core-shell hollow carbon nanofiber@nickel-cobalt double hydroxide composites for supercapacitive energy storage |
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Authors: | Juan Xu Yan Wang Chao Yang Jianyu Cao Zhidong Chen Chaoying Ni |
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Institution: | 1.School of Petrochemical Engineering, Advanced Catalysis and Green Manufacturing Collaborative Innovation Center,Changzhou University,Changzhou,China;2.Department of Materials Science and Engineering,University of Delaware,Newark,USA |
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Abstract: | The supercapacitive performances of supercapacitor mainly depend on the physical nanostructure and micro-morphology of electrode materials. Here, we demonstrated the design, synthesis and electrochemical performances of core-shell hollow carbon nanofiber@nickel-cobalt-layered double hydroxide (HCNF@ Ni0.67Co0.33-LDH) nanocomposites with an optimized Ni/Co molar ratio of 2:1. The HCNF was used as superiorly conductive core to sustain the nanoporous silky Ni0.67Co0.33-LDH shell, which can efficiently provide fast transport pathways for electrons and electrolyte ions. The outstanding specific capacitance of 2486 F g?1 at 1 A g?1 based on galvanostatic charge-discharge curves were acquired for the highly electroactive HCNF@Ni0.67Co0.33-LDH. Furthermore, the HCNF@Ni0.67Co0.33-LDH electrode delivered a distinguished rate capability with a specific capacitance of 1890 F g?1 even at 15 A g?1. Notably, an asymmetric supercapacitor with HCNF@Ni0.67Co0.33-LDH as cathode and HCNF as anode was devised, which presented a prominent specific capacitance of 228 F g?1, good energy density of 62.1 Wh kg?1, and impressive cycling stability (90.6% capacitance retention after 10,000 cycles). |
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