KOH-activated depleted fullerene soot for electrochemical double-layer capacitors

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• 作者：Li Sun (1)
  Chunlei Wang (1)
  Ying Zhou (1)
  Xu Zhang (1)
  Jieshan Qiu (1)
  
• 关键词：Depleted fullerene soot ; Activated carbon ; Activation ; Electrochemical double ; layer capacitor
• 刊名：Journal of Applied Electrochemistry
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：44
• 期：2
• 页码：309-316
• 全文大小：839 KB
• 作者单位：Li Sun (1)
  Chunlei Wang (1)
  Ying Zhou (1)
  Xu Zhang (1)
  Jieshan Qiu (1)
  
  1. Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China
  
• ISSN：1572-8838

文摘

Nanostructured activated carbons for electrochemical double-layer capacitors were synthesized from depleted fullerene soot (DFS) via KOH activation. The structural and textural properties of the activated DFS were studied using transmission electron microscopy, X-ray diffraction, and nitrogen sorption. Activated DFS with high specific surface areas (SSAs) of up to 2,153?m2?g? and narrow pore size distributions (PSDs) was obtained by controlling the KOH/DFS ratio. The activated DFS exhibited excellent capacitive behavior, with a high specific capacitance of 250?F?g? at a current density of 50?mA?g? in a 6?M KOH electrolyte, and a high rate performance, with a capacitance retention of up to 80?% at a high scan rate of 200?mV?s?. Moreover, the activated DFS samples exhibited good electrochemical stability; high capacitance retention ratios of?>90?% were obtained at a current density of 2,000?mA?g? for 5,000 cycles with cell voltages of 0.9 and 1.0?V in a two-electrode system. The high electrochemical performance can be attributed to high SSAs, narrow PSDs, and nanoscale particle sizes, which facilitate the formation of electrochemical double layers and rapid ion diffusion.