High performance supercapacitor prepared from hollow mesoporous carbon capsules with hierarchical nanoarchitecture

Dhrubajyoti Bhattacharjya, Min Sik Kim, Tae Sung Bae, Jong Sung Yu

Research output: Contribution to journalArticlepeer-review

128 Scopus citations

Abstract

Hollow core mesoporous shell carbon (HCMSC) capsules are prepared by nano-casting method which involves surfactant-assisted synthesis of silica spheres with mesoporous shell as template and impregnation of carbon precursor into mesoporous shell of the silica, followed by carbonization and silica template removal. The resulting HCMSC capsules possess 3D-interconnected nanoarchitecture with unique hierarchical meso/macro-porosity along with high surface area and large mesopore volume. The HCMSC capsules are tested for electrochemical double layer capacitor in a standard two electrode flat cell using non-aqueous electrolyte. The specific capacitance measured by galvanostatic charge-discharge at 0.3 A g-1 current density is found to be 162 F g-1, which is among the highest values reported so far for mesoporous carbon materials in a practical two electrode symmetric system using organic electrolyte. The cyclic performance tested at high current density of 1.0 A g-1 is found to retain 88% of initial capacity up to 2000 charge-discharge cycles. High capacitance performance of the HCMSC is attributed to the well-developed hierarchical 3D open network of macropores and interstitial void open to mesopores in the mesoporous shell, which not only facilitate fast charge transfer, but also facile electrolyte movement to access the active sites.

Original languageEnglish
Pages (from-to)799-805
Number of pages7
JournalJournal of Power Sources
Volume244
DOIs
StatePublished - 2013

Bibliographical note

Funding Information:
This work was generously supported by Korea University (2012). Authors also would like to thank the Korean Basic Science Institute at Jeonju, Chuncheon and Daejeon for SEM, TEM and XRD measurements.

Keywords

  • Carbon capsule
  • Mesopore
  • Organic electrolyte
  • Supercapacitor
  • Two electrode system

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