Coaxial RuO2–ITO Nanopillars for Transparent Supercapacitor Application
journal contributionposted on 2014-02-18, 00:00 authored by Ilhwan Ryu, MinHo Yang, Hyemin Kwon, Hoo Keun Park, Young Rag Do, Sang Bok Lee, Sanggyu Yim
Supercapacitive properties of ruthenium oxide (RuO2) nanoparticles electrodeposited onto the indium tin oxide (ITO) nanopillars were investigated. Compared to conventional planar current collectors, this coaxially nanostructured current collector–electrode system can provide increased contact for efficient charge transport, and the internanopillar spacing allows easy access of electrolyte ions. The morphological and electrochemical properties depended on the thickness of the RuO2 layers, i.e., the number of electrodeposition cycles. A maximum specific capacitance, Csp, of 1235 F/g at a scan rate of 50 mV/s was achieved for the 30-cycle deposited RuO2–ITO nanopillars. The other capacitive properties such as electrochemical reversibility and Csp retention at high scan rates also improved greatly.
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scan ratesruthenium oxidecoaxially nanostructuredcollectorindium tin oxideinternanopillar spacingelectrodeposition cyclescapacitive propertiesscan rateelectrochemical reversibilityTransparent Supercapacitor ApplicationSupercapacitive propertiesITOelectrochemical propertiescharge transportCsp retentionRuO 2 layerselectrolyte ions