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Electrochemical supercapacitors based on carbon aerogels/Ni(OH)2 composites and activated carbon

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Purpose ‐ The purpose of this paper is to show how to obtain a supercapacitor with high specific power (P) and high specific energy (Ep) simultaneously. Design/methodology/approach ‐ The carbon aerogels are obtained by ambient pressure drying method instead of supercritical drying method and carbon aerogels/Ni(OH)2 composites are prepared by in situ polymerisation. A series of asymmetric supercapacitors based on carbon aerogels/Ni(OH)2 composites as positive electrode and activated carbon as negative electrode, respectively, are assembled. The electrochemical performances of carbon aerogels/Ni(OH)2 composites and supercapacitors are studied. Findings ‐ The results show that the specific capacitance (CP) of carbon aerogels/Ni(OH)2 composites is 584?F/m2. The working potential of supercapacitors could be increased to 1.6V. When the mass ratio of carbon aerogels and Ni(OH)2 is 3:7, the mass ratio of positive electrode and negative electrode is 1:1, the EP and P of the supercapacitor is higher than 10.5?Wh/kg and 578?W/kg, respectively, when the current varies from 50?mA to 100?mA and the attenuation ratio of CP is only 8.3 per cent after 10,000 cycles at 100?mA. Practical implications ‐ The supercapacitors can be used in the field of automobile engineering and can solve the problems of energy shortage and environmental pollutions. Originality/value ‐ The supercapacitor based on carbon aerogels/Ni(OH)2 composites as positive electrode and activated carbon as negative electrode is novel and the synthetic properties of the supercapacitor are excellent.
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Keywords: Capacitors; Carbon; Electrochemistry; Energy technology

Document Type: Research Article

Publication date: July 3, 2009

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