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| Preparation of graphene-based aerogels and their supercapacitive performance |
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YAN Zi-feng1, WU Xiao-zhong1, XING Wei1,2
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(1.State Key Laboratory of Heavy Oil Processing in China University of Petroleum, Qingdao 266580, China;2.College of Science in China University of Petroleum, Qingdao 266580, China)
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| Abstract: |
| A self-assembly method was adopted to synthesize graphene oxide aerogel (GOA), which was further reduced by hydrogen at 1100℃ to obtain graphene aerogel (GA). Nitrogen adsorption analysis results show that both aerogels possess high BET surface areas (approximate 870m2·g-1). FT-IR analysis results reveal that the surface of GOA has more oxygen-containing groups than those of GA. Elemental results display that the C/O molar ratios of GOA and GA are 1.7and 69.9, respectively. Electrochemical measurements show that at the current density of 0.2A·g-1, the specific capacitance of GOA with high surface functionalized degree could reach up to 155.8F·g-1, while GA with low surface functionalized degree exhibits a high-rate supercapacitive performance. |
| Key words: supercapacitor graphene-based aerogel surface functionalized degree electrode materials specific capacitance |
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