Characterization and organic electric-double-layer-capacitor application of KOH activated coal-tar-pitch-based carbons: Effect of carbonization temperature |
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| Institution: | 1. C-Industry Incubation Center, Korea Research Institute of Chemical Technology (KRICT), Gajeong-ro, Daejeon 305-600, Republic of Korea;2. Department of Chemical and Biomolecular Engineering, Pusan National University, 2, Busandaehak-ro 63 beon-gil, Geumjung, Busan 609-735, Republic of Korea;3. University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-Gu, Daejeon 305-333, Republic of Korea;4. Department of Applied Chemistry and Biological Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea;1. Alternative Energy and Nanotechnology Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai, 600036, India;2. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India;1. School of Printing and Packaging Engineering, Xi’an University of Technology, Xi’an 710048, PR China;2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, PR China |
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| Abstract: | The present study reports the influence of pre-carbonization on the properties of KOH-activated coal tar pitch (CTP). The change of crystallinity and pore structure of pre-carbonized CTPs as well as their activated carbons (ACs) as function of pre-carbonization temperature are investigated. The crystallinity of pre-carbonized CTPs increases with increasing the carbonization temperature up to 600 °C, but a disorder occurs during the carbonization around 700 °C and an order happens gradually with increasing the carbonization temperatures in range of 800–1000 °C. The CTPs pre-carbonized at high temperatures are more difficult to be activated with KOH than those pre-carbonized at low temperatures due to the increase of micro-crystalline size and the decrease of surface functional groups. The micro-pores and meso-pores are well developed at around 1.0 nm and 2.4 nm, respectively, as the ACs are pre-carbonized at temperatures of 500–600 °C, exhibiting high specific capacitances as electrode materials for electric double layer capacitor (EDLC). Although the specific surface area (SSA) and pore volume of ACs pre-carbonized at temperatures of 900–1000 °C are extraordinary low (non-porous) as compared to those of AC pre-carbonized at 600 °C, their specific capacitances are comparable to each other. The large specific capacitances with low SSA ACs can be attributed to the structural change resulting from the electrochemical activation during the 1st charge above 2.0 V. |
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| Keywords: | A Microporous materials C X-ray diffraction D Electrochemical properties |
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