Abstract
A Sb (6 mol%)-doped SnO 2 xerogel impregnated with RuO 2 nanocrystallites is prepared via an incipient-wetness method and is optimized for its electrochemical capacitance in aqueous 1 M KOH electrolyte by adjusting the calcination temperature and the RuO 2 loading. The electrode capacitance does not increase monotonically with increasing RuO 2 loading. A maximum electrode capacitance of 15 F g −1, which represents a three-fold increase compared with the blank xerogel and a specific RuO 2 capacitance of 710 F g −1 RuO 2, is obtained with a RuO 2 loading of 1.4 wt.% and by calcination at 200 °C. Higher loadings presumably result in a homogeneous nucleation upon drying, which causes severe reduction in the total surface area of the RuO 2 crystallites.
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