The effects of preparation temperature on microstructure and electrochemical performance of calcium carbide-derived carbon
| Autor: | Qiliang Wei, Na Li, Hao Wu, Xue Liu, Lanlan Jiang, Chun Wu, Yansong Bai, Benan Hu, Xianyou Wang |
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| Rok vydání: | 2013 |
| Předmět: |
Supercapacitor
Materials science Calcium carbide Nanotechnology Microporous material Condensed Matter Physics Microstructure chemistry.chemical_compound Adsorption chemistry Chemical engineering Desorption Specific surface area Electrochemistry General Materials Science Electrical and Electronic Engineering Porosity |
| Zdroj: | Journal of Solid State Electrochemistry. 17:2453-2460 |
| ISSN: | 1433-0768 1432-8488 |
| DOI: | 10.1007/s10008-013-2126-z |
| Popis: | Calcium carbide-derived carbons (CCDCs) produced by chlorination of CaC2 at various temperatures (400–800 °C) possess highly controllable microstructure and porosity, allowing them to serve as excellent electrode materials for the application of supercapacitor. This paper focused on the effect of pore size and specific surface area (SSA) of CCDC on its electrochemical behavior. Microstructure and micropore characteristics of CCDC were characterized by N2 adsorption/desorption isotherms, X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that SSA and average pore size increased with the increase of synthesis temperature from 400 °C to 600 °C, and then decreased when temperature reached to 800 °C. Meanwhile, a correlation between specific capacitance and SSA of micropores (less than 2 nm in diameter) has been studied. It has been found that the supercapacitor using the CCDC prepared at 600 °C as electrode material in 6 M KOH showed the maximum specific capacitance and energy density (53.61 F g−1 and 7.08 W h kg−1), outstanding rate capability, lower IR drop and 96 % retention of initial capacity over 5,000 cycles. |
| Databáze: | OpenAIRE |
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