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林产化学与工业 ›› 2017, Vol. 37 ›› Issue (1): 87-93.doi: 10.3969/j.issn.0253-2417.2017.01.011

• 研究报告 • 上一篇    下一篇

二次水蒸气活化制备离子液体超级电容器活性炭的研究

陈莉晶, 左宋林, 张秋红, 陈继锡, 王永芳   

  1. 南京林业大学 化学工程学院, 江苏 南京 210037
  • 收稿日期:2016-03-31 出版日期:2017-02-25 发布日期:2017-02-25
  • 通讯作者: 左宋林,教授,博士生导师,研究领域为生物质热解与炭材料;E-mail:zslnl@hotmail.com。 E-mail:zslnl@hotmail.com
  • 作者简介:陈莉晶(1991-),女,江苏南京人,硕士生,从事林产化学加工工程方面的研究
  • 基金资助:
    国家林业局948技术引进项目(2012-4-08)

Preparation of Activated Carbon by Steam Re-activation for Ionic Liquid Electrolyte Supercapacitors

CHEN Lijing, ZUO Songlin, ZHANG Qiuhong, CHEN Jixi, WANG Yongfang   

  1. College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China
  • Received:2016-03-31 Online:2017-02-25 Published:2017-02-25

摘要: 为改善工业物理法产普通活性炭的孔隙结构,提高其作为离子液体超级电容器电极材料的性能,采用水蒸气活化法,分别对煤质活性炭(CAC)、椰壳活性炭(CSAC)和竹基活性炭(BAC)进行二次活化,探讨了工艺条件对活性炭孔隙结构的影响,并利用恒电流充放电、循环伏安曲线和交流阻抗等方法对3种活性炭制作的双电层电容器的电化学性能进行了研究。结果表明:二次水蒸气活化能够显著提高活性炭中孔孔容,从而大大提高吸附性能,3种活性炭的碘吸附值、亚蓝吸附值均相比原料有较大提升;二次水蒸气活化对CSAC的孔隙结构和比电容量影响最显著,二次活化椰壳活性炭的BET比表面积可达1 972 m2/g,电流密度0.5 A/g时,超级电容器的比电容量可达106 F/g,是原料(43F/g)的2.5倍。

关键词: 活性炭, 水蒸气二次活化, 孔隙结构, 离子液体超级电容器

Abstract: In order to improve the pore structure and electrochemical performance of commcercially available activated carbons, the coal-based activated carbon(CAC), coconut shell-based activated carbon(CSAC) and bamboo-based activated carbons(BAC) were chosen for the steam re-activated. The pore structure and electrochemical performance of the activated carbons were characterized by using nitrogen adsorption, galvanostatic charge/discharge, cyclic voltammetry curve and electrochemical impedance spectroscopy(EIS). The effects of the re-activation parameters of the activation temperature and dosage of steam on the pore structure and electrochemical properties of activated carbons were investigated. The results showed that the steam re-activation could significantly improve the development of pore structure, especially the mesopores, and the adsorption capacity of iodine and methylene blue as well as the electrochemical performance. The properties of coconut shell-based activated carbon was significantly improved by the re-activation compared with other activated carbons. After re-activation, the specific capacitance of the coconut shell-based activated carbon could reach 106 F/g, which was 2.5 times of the pristine activated carbon.

Key words: activated carbon, steam re-activation, pore structure, ionic liquid supercapacitor

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