Novel method for the preparation of carbon supported nano-sized amorphous ruthenium oxides for supercapacitors

Yong Hee Lee, Jong Gil Oh, Hyung Suk Oh, Hansung Kim

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17 Citations (Scopus)

Abstract

Nanostructured amorphous RuO2 · xH2O/C composite materials are prepared via a modified sol-gel process using glycolic acid. The glycolate anion, which dissociates from glycolic acid at pH 7, behaves as a stabilizer by adsorbing onto the RuO2 · xH2O surface, thus resulting in particles with a size of about 2 nm. As evidenced by zeta potential measurements, the surface charge of RuO2 · xH2O becomes more electronegative as the amount of glycolic acid increases. After heat treatment at 160 oC to remove the stabilizer, RuO2 · xH2O/C is found to exhibit an amorphous structure. The specific capacitance of RuO2 · xH2O/C particles (40 wt% Ru) prepared in the presence of glycolic acid (0.3 g L-1) is 462 F g-1, which is 30% higher than that of the material prepared in the absence of glycolic acid. Both the nanosized particles and the amorphous structure mainly contribute to this increase in the specific capacitance.

Original languageEnglish
Pages (from-to)1035-1037
Number of pages3
JournalElectrochemistry Communications
Volume10
Issue number7
DOIs
Publication statusPublished - 2008 Jul 1

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All Science Journal Classification (ASJC) codes

  • Electrochemistry

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