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Activated carbons derived from sugarcane bagasse for high-capacitance electrical double layer capacitors |
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| Authors: | Phakkhawan Authit Horprathum Mati Chanlek Narong Nakajima Hideki Nijpanich Supinya Kumnorkaew Pisist Pimanpang Samuk Klangtakai Pawinee Amornkitbamrung Vittaya |
| Affiliation: | 1.Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand ;2.National Electronics and Computer Technology Center (NECTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand ;3.Synchrotron Light Research Institute (Public Organization), 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand ;4.National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani, 12120, Thailand ;5.Department of Physics, Faculty of Science, Srinakharinwirot University, Bangkok, 10110, Thailand ;6.Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), NANOTEC-KKU RNN on Nanomaterials Research and Innovation for Energy, Khon Kaen University, Khon Kaen, 40002, Thailand ;7.Thailand Center of Excellence in Physics (TheP), Chiang Mai University, P.O. Box 70, Chiang Mai, 50202, Thailand ; |
| Abstract: | Activated carbon (AC) from sugarcane bagasse was prepared using a simple two-step method of carbonization and chemical activation with four different activating agents (HNO3, H2SO4, NaOH, and KOH). Amorphous carbon structure as identified by X-ray diffraction was observed in all samples. Scanning electron microscopy revealed that the AC had more porosity than the non-activated carbon (non-AC). Specific capacitance of the non-AC electrode was 32.58 F g?1 at the current density of 0.5 A g?1, whereas the AC supercapacitor provided superior specific capacitances of 50.25, 69.59, 109.99, and 138.61 F g?1 for the HNO3 (AC-HNO3), H2SO4 (AC-H2SO4), NaOH (AC-NaOH), and KOH (AC-KOH) activated carbon electrodes, respectively. The AC-KOH electrode delivered the highest specific capacitance (about 4 times of the non-AC electrode) because of its good surface wettability, the largest specific surface area (1058.53 m2 g?1), and the highest total specific pore volume (0.474 cm3 g?1). The AC-KOH electrode also had a great capacitance retention of almost 100% after 1000 GCD cycles. These results demonstrate that our AC developed from sugarcane bagasse has a strong potential to be used as high stability supercapacitor electrode material. |
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