Activation of raw pitch coke with alkali hydroxide to prepare high performance carbon for electric double layer capacitor |
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| Affiliation: | 1. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China;2. College of Mechanical and Electrical Engineering, China University of Petroleum (East China), Qingdao 266580, China;1. College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, China;2. State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Qingdao 266580, China;3. National Institute of Clean & Low Carbon Energy, Beijing 102211, China;4. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, Changzhou University, Changzhou 213164, China;1. Department of Organic and Nano Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea;2. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;3. Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga, Fukuoka 816-8580, Japan;1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, PR China;2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, PR China;3. Centre for Sustainable Materials Research & Technology (SMaRT), School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;4. Department of Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada;5. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China;1. Fuel Cell Laboratory, Korea Institute of Energy Research (KIER), Daejeon, 34129, Republic of Korea;2. Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of Korea;3. Advanced Energy and System Engineering, University of Science and Technology (UST), Daejeon 34113, Republic of Korea;4. Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan;1. C1 Gas & Carbon Convergent Research Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea;2. Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Republic of Korea;3. Department of Chemical Engineering and Applied Chemistry, Chungnam National University, Daejeon 34134, Republic of Korea;4. Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Daejeon 34113, Republic of Korea;5. Research and Development Division, Korea Institute of Convergence Textile, Iksan-si 54588, Republic of Korea |
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| Abstract: | Powder of raw pitch coke was activated with alkali hydroxides at 500–900 °C to prepare carbon electrode of high capacitance for electric double layer capacitor (EDLC). KOH provided very high surface area of 2320 m2/g at 800 °C, while NaOH did moderate surface area of 1000 m2/g at 650–750 °C. High surface area provided by KOH led to a high capacitance per weight of 39 F/g. However, its capacitance per volume was as low as 16 F/ml. Although the coke of moderate surface area activated with NaOH showed a similar capacitance per weight, its capacity per volume was as high as 28 F/ml because of its high density. Adequate porosity must be selectively introduced by NaOH activation to the coke to obtain moderate surface area. Much smaller expansion of layers in the present needle type coke activated by NaOH than that by KOH is indicative for the higher density of the former activated coke. |
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