...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of power sources >Cresol-formaldehyde based carbon aerogel as electrode material for electrochemical capacitor
【24h】

Cresol-formaldehyde based carbon aerogel as electrode material for electrochemical capacitor

机译：甲酚甲醛基碳气凝胶作为电化学电容器的电极材料

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Carbon aerogels have been prepared through a polycondensation of cresol (Cm) with formaldehyde (F) and an ambient pressure drying followed by carbonization at 900 deg C. Modification of the porous structures of the carbon aerogel can be achieved by CO_2 activation at various temperatures (800,850,900 deg C) for 1-3 h. This process could be considered as an alternative economic route to the classic RF gels synthesis. The obtained carbon aerogels have been attempted as electrode materials in electric double-layer capacitors. The relevant electrochemical behaviors were characterized by constant current charge-discharge experiments, cyclic voltammetry and electrochemical impedance spectroscopy in an electrolyte of 30 percent KOH aqueous solution. The results indicate that a mass specific capacitance of up to 78 Fg~(-1)for the non-activated aerogel can be obtained at current density 1 mAcm~(-2). CO2 activation can effectively improve the specific capacitance of the carbon aerogel. After CO_2 activation performed at 900 deg C for 2h, the specific capacitance increases to 146 Fg~(-1) at the same current. Only a slight decrease in capacitance, from 146 to 131 Fg~(-1) was observed when the current density increases from 1 to 20 mA cm~(-2), indicating a stable electrochemical property of carbon aerogel electrodes in 30 percent KOH aqueous electrolyte with various currents.
机译：碳气凝胶的制备方法是将甲酚（Cm）与甲醛（F）进行缩聚反应，然后在常压下干燥，然后在900摄氏度下进行碳化。碳气凝胶的多孔结构可通过在各种温度下CO_2活化来实现800,850,900摄氏度）1-3小时。该过程可被视为经典RF凝胶合成的另一种经济途径。已经尝试将获得的碳气凝胶用作双电层电容器中的电极材料。通过在30％KOH水溶液中的电解质进行恒流充放电实验，循环伏安法和电化学阻抗谱来表征相关的电化学行为。结果表明，在1 mAcm〜（-2）的电流密度下，非活化气凝胶的质量比电容可达78 Fg〜（-1）。 CO 2活化可以有效地改善碳气凝胶的比电容。在900摄氏度下进行CO_2活化2h后，在相同电流下比电容增加至146 Fg〜（-1）。当电流密度从1 mA增加到20 mA cm〜（-2）时，仅观察到电容从146 Fg〜（-1）到131 Fg〜（-1）的小幅下降，表明在30％KOH水溶液中碳气凝胶电极具有稳定的电化学性能各种电流的电解质。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号