Ultra high capacitance values of Pt@RuO2 core–shell nanotubular electrodes for microsupercapacitor applications

Abstract

Arrays of Pt@RuO2 core–shell nanotubes were prepared by electrodeposition of RuO2 on Pt nanotubes and evaluated as electrochemical microsupercapacitor electrodes. Specific capacitance of ca. 1585 and 1280Fg−1RuO2 is obtained at sweep rates of 2 and 500 mV s−1, respectively, demonstrating high utilization factor of RuO2 due to facilitated transport of protons and electrons. The specific geometric capacitance for the Pt@RuO2 core shell nanotubes electrode is 320 mF cm−2 at 2 mV s−1 and 256 mF cm−2 at 500 mV s−1.