Acta Chimica Sinica ›› 2011, Vol. 69 ›› Issue (21): 2627-2631.DOI: 10.6023/A1007192B Previous Articles     Next Articles

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  1. (湖南大学材料科学与工程学院 长沙 410082)
  • 投稿日期:2010-07-19 修回日期:2011-07-01 发布日期:2011-07-14
  • 通讯作者: 刘洪波
  • 基金资助:


Effect of Carbonization Temperature on Pore Structure and Electrochemical Properties of Tobacco Stem-based Activated Carbon

XIA Xiao-Hong, SHI Lei, HE Yue-De, YANG Li, LIU Hong-Bo   

  1. (College of Materials Science and Engineering, Hunan University, Changsha 410082)
  • Received:2010-07-19 Revised:2011-07-01 Published:2011-07-14
  • Contact: Hong-Bo LIU

Activated carbon with reasonable pore structure used for electric double layer capacitor (EDLC) was prepared with tobacco stem as raw material and KOH as activator by chemical activation after carbonization at 500~800 ℃. The specific surface area and pore structure of activated carbon were characterized by nitrogen adsorption isotherm at 77 K. The pore volume and mesoporosity of activated carbons increased with decrease of carbonization temperature, while the BET surface area increased firstly and decreased afterwards. The electrochemical behaviors were characterized by means of galvanostatic charging/discharging, cycle voltammetry and impedance spectroscopy. The correlation between electrochemical properties and pore structure was investigated. The results show that TS-AC samples with high mesoporosity exhibited excellent high current charge/discharge performance of 80% capacitance maintenance when current density was enlarged 50 times. And TS-AC-600 exhibited the highest specific dc capacitance over 190 F•g-1 at 1 mA•cm-2, which possess the highest specific surface area and pore volume, 3333 m2•g-1 and 2.47 cm3•g-1, respectively.

Key words: activated carbon, tobacco stem, carbonization temperature, pore structure, electrochemical performance