Hierarchical porous nanofibers of carbon@nickel oxide nanoparticles derived from polymer/block copolymer system |
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| Institution: | 1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;2. BaiYin Research Institute of Novel Materials, Lanzhou University of Technology, Lanzhou 730050, China;1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, PR China;2. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, PR China;1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, PR China;2. School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, PR China;1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, PR China;2. Department of Chemistry and Biochemistry, University of California, 1156High Street, Santa Cruz, California 95064, USA;1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, PR China;2. School of Material Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, PR China |
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| Abstract: | The triblock copolymer (PAA-b-PAN-b-PAA) is prepared by reversible addition-fragmentation chain-transfer polymerization, and then blended with polymer (PAN) and metal hydroxide (Ni(OH)2) as a precursor for heat-treatment. A composite material of hierarchical porous nanofibers and nickel oxide nanoparticles (HPCF@NiO) is prepared by electrospinning combined with high-temperature carbonization. The effects of the ratio of PAA and PAA-b-PAN-b-PAA on the internal structure of nanofibers and their electrochemical properties as positive electrode materials are investigated. The experimental results show that when the ratio of PAA to PAA-b-PAN-b-PAA is 1.3 to 0.4, it has good pore structure and excellent electrochemical performance. At the current density of 1 A/g, the specific capacitance is 188.7 F/g and the potential window is ?1 V to 0.37 V. The asymmetric supercapacitor assembled with activated carbon as the negative electrode materials has a specific capacitance of 21.2 F/g in 2 mol/L KOH and a capacitance retention of 85.7% after 12,500 cycles at different current density. |
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| Keywords: | Electrospinning Block copolymer Nickel oxide Hierarchical porous carbon fiber Supercapacitors |
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