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

31 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

Fingerprint

electrochemical capacitors
Nanoparticles
costs
nanoparticles
Carbon
radiant flux density
Costs
carbon
spraying
Spraying
Nanohorns
Crystalline materials
compacting
Boron
composite materials
Composite materials
assembling
Charge density
Binders
electric batteries

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Hierarchical design for fabricating cost-effective high performance supercapacitors. / Kim, Nam Dong; Buchholz, D. Bruce; Casillas, Gilberto; José-Yacaman, Miguel; Chang, Robert P. H.

In: Advanced Functional Materials, Vol. 24, No. 26, 09.07.2014, p. 4186-4194.

Research output: Contribution to journalArticle

Kim, Nam Dong ; Buchholz, D. Bruce ; Casillas, Gilberto ; José-Yacaman, Miguel ; Chang, Robert P. H. / Hierarchical design for fabricating cost-effective high performance supercapacitors. In: Advanced Functional Materials. 2014 ; Vol. 24, No. 26. pp. 4186-4194.
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