4.6 Article

Ribbon-like activated carbon with a multi-structure for supercapacitors

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JOURNAL OF MATERIALS CHEMISTRY A
卷 1, 期 44, 页码 14008-14012

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ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13138f

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  1. Advanced Technology Center program of the Korea Evaluation Institute of Industrial Technology (KEIT)
  2. Korea government Ministry of Trade, Industry Energy [10035919, 20122010100090, 20122010100140]
  3. Energy Efficiency & Resources program of the Korea Institute of Energy Technology Evaluation Planning (KETEP)

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Ribbon-like activated carbon (RAC) has been successfully developed by a two-step activation process based on alkali activation and an electrochemical activation route. The multi-structure of the RAC features a porous graphitic structure with the coexistence of micropores and graphitic structures, mainly originating from the loose packing of the graphite sheets as a result of the degree of graphitization controlled by the carbonization conditions. RAC provides the tremendous benefits of excellent cycle life, high power (3.2 kW kg(-1)), and high energy density (43.5 W h kg(-1)) for electric double-layer capacitors, because of its graphitic architecture comprised of micropores and ring-shaped crystalline structures. In addition to investigating the improved electrochemical performance, we observed an interesting feature of the RAC: the obtained RAC has a high structural stability as shown by ex situ high-resolution transmission electron microscopy (HR-TEM). These extraordinary results are attributed to the unique structure of RAC.

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