Introduction of Co3O4 into activated honeycomb-like carbon for the fabrication of high performance electrode materials for supercapacitors

Myeongjin Kim, Ilgeun Oh, Hyun Ju, Jooheon Kim

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

In this work, a three-dimensional hierarchical carbon framework/Co3O4 hybrid composite was fabricated. The three-dimensional hierarchical carbon framework was constructed by thermal vapor deposition on the silica nanosphere templates and etching these templates. The resulting carbon framework was activated using phosphoric acid to control its surface area and porosity. The degree of activation of the carbon framework was optimized by measuring the specific capacitance. The carbon framework electrode activated with 3 M phosphoric acid (HCCA(3)) exhibited the highest specific capacitance (134 F g-1 at 10 mV s-1). Subsequently, Co3O4 was formed on the carbon framework via the hydrothermal method. The resulting product HCCA(3)/Co3O4 showed a dramatic enhancement in the specific capacitance (456 F g-1 at 1 A g-1) compared with the pristine Co3O4 and HCCA(3) electrodes. The proposed HCCA(3)/Co3O4 composite can be used for the fabrication of high-performance electrodes.

Original languageEnglish
Pages (from-to)9124-9132
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume18
Issue number13
DOIs
StatePublished - 7 Apr 2016

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