Hierarchical design for fabricating cost-effective high performance supercapacitors

Nam Dong Kim, D. Bruce Buchholz, Gilberto Casillas, Miguel José-Yacaman, Robert P.H. Chang

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

The salient feature of a supercapacitor is its ability to deliver much higher power density than a battery. A hierarchical design and a cost-effective approach to fabricate high performance supercapacitors using functional carbon nano-particles is reported. A special arc synthesis method is used to produce amorphous/crystalline composite with nitrogen and boron co-doped high charge density carbon nanoparticles. Upon etch removal of the amorphous phase in the composite nanoparticle, a crystalline carbon framework emerges, consisting of a mixture of nano-graphitic sheets mostly in the middle and single nanohorns distributed around the surface of the nanoparticle. These nanoparticles have large internal/external surfaces with subnano channels and sharp nano-tips for high speed charge transport and local charge accumulation. To deliver high power density, the internal resistance of the device is reduced by assembling the nanoparticles via electro-spraying and compacting them into dense films (without any binder) under 700 MPa of pressure before supercapacitor assembly. Taken together, the hierarchical processed supercapacitor has a very high (compared to literature values) power density of nearly 4.5 kW cm-3 and a respectable energy density of 2.45 mWh cm-3. Combining these carbon nanoparticles with large area spraying coating, it can lead to a cost-effective production of high performance supercapacitors.

Original languageEnglish
Pages (from-to)4186-4194
Number of pages9
JournalAdvanced Functional Materials
Volume24
Issue number26
DOIs
Publication statusPublished - Jul 9 2014

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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