High Power- and Energy-Density Supercapacitors through the Chlorine Respiration Mechanism |
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| Authors: | Xiaotong Fan Dr Kai Huang Prof Long Chen Haipeng You Menglei Yao Prof Hao Jiang Prof Ling Zhang Prof Cheng Lian Dr Xiangwen Gao Prof Chunzhong Li |
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| Institution: | 1. Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, Frontiers Science Center for Materiobiology and Dynamic Chemistry, School of Chemical Engineering, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, 200237 China;2. State Key Laboratory of Chemical Engineering, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237 China;3. Department of Materials, University of Oxford, Oxford, OX1 3PH UK |
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| Abstract: | Supercapacitor represents an important electrical energy storage technology with high-power performance and superior cyclability. However, currently commercialized supercapacitors still suffer limited energy densities. Here we report an unprecedentedly respiring supercapacitor with chlorine gas iteratively re-inspires in porous carbon materials, that improves the energy density by orders of magnitude. Both electrochemical results and theoretical calculations show that porous carbon with pore size around 3 nm delivers the best chlorine evolution and adsorption performance. The respiring supercapacitor with multi-wall carbon nanotube as the cathode and NaTi2(PO4)3 as the anode can store specific energy of 33 Wh kg?1 with negligible capacity loss over 30 000 cycles. The energy density can be further improved to 53 Wh kg?1 by replacing NaTi2(PO4)3 with zinc anode. Furthermore, thanks to the extraordinary reaction kinetics of chlorine gas, this respiring supercapacitor performs an extremely high-power density of 50 000 W kg?1. |
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| Keywords: | Aqueous Electrolyte Chlorine Porous Carbon Respiring Supercapacitor |
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