物理化学学报 >> 2008, Vol. 24 >> Issue (02): 237-242.doi: 10.3866/PKU.WHXB20080210

研究论文 上一篇    下一篇

新型微晶炭的结构与电化学电容特性

时志强; 陈明鸣; 赵朔; 王成扬   

  1. 天津大学化工学院, 绿色合成与转化教育部重点实验室, 天津 300072
  • 收稿日期:2007-08-03 修回日期:2007-11-08 发布日期:2008-01-26
  • 通讯作者: 王成扬 E-mail:cywang@tju.edu.cn

Structure and Electrochemical Capacitive Behavior of Novel Crystallite Carbon

SHI Zhi-Qiang; CHEN Ming-Ming; ZHAO Shuo; WANG Cheng-Yang   

  1. Key Laboratory for Green Chemical Technology of the Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, P. R. China
  • Received:2007-08-03 Revised:2007-11-08 Published:2008-01-26
  • Contact: WANG Cheng-Yang E-mail:cywang@tju.edu.cn

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摘要： 以炭化的石油焦为原料, 采用KOH活化法制备了新型微晶炭; 采用N2吸附法、X射线衍射(XRD)和高分辨透射电子显微镜(HRTEM)对其孔结构、微晶结构和微结构进行表征, 并研究了微晶炭电极在1 mol·L-1 Et4NBF4/PC有机电解液中的电容特性. 结果表明, 微晶炭含有大量的较为完整的类石墨晶, 微晶的平均层间距d002为0.377 nm; 具有比活性炭低的比表面积(130.7 m2·g-1)和更明显的晶体特性. 微晶炭依靠电解质离子嵌入类石墨晶层间存储能量, 具有高达110.6 F·g-1的放电比电容和27.5 Wh·kg-1的比能量, 并具有大于1.2 kW·kg-1的比功率和良好的循环性能, 是一种具有实用化潜力的新型炭电极材料.

关键词: 微晶炭, 类石墨晶, 孔结构, 嵌入

Abstract: A novel crystallite carbon (NCC)was prepared by KOH activation of carbonized petroleumcoke precursors. The porous structure, crystallite structure, and microstructure were characterized by N2 adsorption-desorption, X-ray diffraction (XRD), and high resolution transmission electron microscopy (HRTEM) measurements, respectively. The capacitive behavior of the NCC electrodes was also examined with 1 mol·L-1 tetraethylammonium tetrafluoroborate (Et4NBF4) solution in propylene carbonate (PC). It was found that the NCC was composed of much well-grown graphite-like crystallite with average interlayer spacing (d002) of 0.377 nm. The NCC had lower surface area (130.7 m2·g-1) and more distinct crystal character than activated carbon (AC). The energy storage for the NCC depended on the intercalation of electrolyte ions into graphite-like crystallite layers. The specific capacitance of the NCC was 110.6 F·g-1, showing specific energy of 27.5 Wh·kg-1, specific power of over 1.2 kW·kg-1 and excellent cycle stability. Therefore, the crystallite carbon is a promising candidate for novel electrode material.

Key words: Crystallite carbon, Graphite-like crystallite, Porous structure, Intercalation