Science China Materials

, Volume 58, Issue 7, pp 521–533 | Cite as

Comparison of surface and bulk nitrogen modification in highly porous carbon for enhanced supercapacitors

  • Stephanie L. Candelaria
  • Evan Uchaker
  • Guozhong Cao
Articles

Abstract

Highly porous carbon prepared through sol-gel processing can be modified with nitrogen via a simple solution-based method to achieve increased capacitance. Nitrogen was added either in the form of a surface coating using hexamine or incorporated into the bulk carbon network upon heat treatment of the hexamine-coated carbon. The properties and electrochemical behavior of both materials were measured and compared to that of unmodified porous carbon. Nitrogen in the bulk carbon network shows increased conductivity, while nitrogen coated on the surface of porous carbon is more effective at increasing capacitance. Nitrogen modification can also reduce diffusivity resistance and charge transfer resistance, resulting in supercapacitors with better performance at higher charge and discharge rates.

中文摘要

溶胶-凝胶法制备的高孔隙度多孔碳材料可通过简单溶液法用氮进行改性从而增加电容. 氮的引入可采用表面氮改性通过 引入六亚甲基四胺涂层再热解分解, 或在碳网结构中引入氮两种方式. 本文对两种材料的性能和电化学行为进行测量并与未改 性的多 孔碳进行比较. 在碳网结构中的氮表现出增强的导电性, 而表面进行氮改性的多孔碳对于增强电容更有效. 氮改性还可以通过 减少扩 散电阻和电荷转移电阻, 进而增强超级电容器在高倍率的充放电性能.

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Stephanie L. Candelaria
    • 1
  • Evan Uchaker
    • 1
  • Guozhong Cao
    • 1
  1. 1.Department of Materials Science and EngineeringUniversity of WashingtonSeattleUSA

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