Micro-Mesoporous Carbon Materials Prepared from the Hogweed (Heracleum) Stalks as Electrode Materials for Supercapacitors
| Autor: | M. V. Astakhov, N. V. Isaeva, A. T. Kalashnik, F. S. Tabarov, I. S. Krechetov, A. A. Klimont |
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| Rok vydání: | 2019 |
| Předmět: |
Supercapacitor
Potassium hydroxide Materials science Carbonization chemistry.chemical_element 02 engineering and technology Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Volume (thermodynamics) chemistry Specific surface area Electrochemistry 0210 nano-technology Mesoporous material Carbon Nuclear chemistry |
| Zdroj: | Russian Journal of Electrochemistry. 55:265-271 |
| ISSN: | 1608-3342 1023-1935 |
| DOI: | 10.1134/s1023193519020125 |
| Popis: | The data on carbonization and surface activation of raw hogweed (Heracleum) are presented. The structural and electrochemical properties of thus synthesized carbon materials which can be used as the electrode materials in supercapacitors are studied. The hogweed samples are preliminarily carbonized at 400°C and then activated with potassium hydroxide (KOH) at temperatures of 700, 800, and 900°C in argon atmosphere. According to isotherms of nitrogen adsorption and the BET equation, the specific surface area of samples activated at 700, 800, and 900°C is 913 ± 22, 1215 ± 70, and 1929 ± 99 m2/g, respectively. As the activation temperature increases, the specific surface area and the mesopore volume of samples also increases, whereas the micropore fraction decreases. 1,1-Dimethylpyrrolidinium tetrafluoroborate in acetonitrile was used as an electrolyte. The specific capacitance of samples activated at 700, 800, and 900°C at the current density of 1 A/g is 51 ± 4, 114 ± 2, and 108 ± 3 F/g, respectively. The 40% increase in the specific surface area and the 35% increase in the volume of mesopores results in the increase in the specific capacitance. The further increase in the specific surface area and the volume of mesopores up to 70% does not increase the specific capacitance. |
| Databáze: | OpenAIRE |
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