Lee, Byung Jun Sivakkumar, S. R. Ko, Jang Myoun Kim, Jong Huy Jo, Seong Mu Kim, Dong Young 2024-01-21T01:02:01Z 2024-01-21T01:02:01Z 2021-09-02 2007-06 0378-7753 https://pubs.kist.re.kr/handle/201004/134369 Amorphous RuO2 center dot xH(2)O and a VGCF/RuO2 center dot xH(2)O nanocomposite (VGCF=vapour-grown carbon fibre) are prepared by thermal decomposition. The morphology of the materials is investigated by means of scanning electron microscopy. The electrochemical characteristics of the materials, such as specific capacitance and rate capability, are investigated by cyclic voltammetry over a voltage range of 0-1.0 V at various scan rates and with an electrolyte solution of 1.0 M H2SO4. The specific capacitance of RuO2 center dot xH(2)O and VGCF/RuO2 center dot xH(2)O nanocomposite electrodes at a scan rate of 10 mV s(-1) is 410 and 1017 F g(-1), respectively, and at 1000 mV s(-1) are 258 and 824 F g(-1), respectively. Measurements of ac impedance spectra are made on both the electrodes at various bias potentials to obtain a more detailed understanding of their electrochemical behaviour. Long-term cycle-life tests for 10(4) cycles shows that the RuO2 center dot xH(2)O and VGCF/RuO2 center dot xH(2)O electrodes retain 90 and 97% capacity, respectively. These encouraging results warrant further development of these electrode materials towards practical application. (C) 2007 Elsevier B.V. All rights reserved. English ELSEVIER Carbon nanofibre/hydrous RuO2 nanocomposite electrodes for supercapacitors Article 10.1016/j.jpowsour.2007.02.076 1 JOURNAL OF POWER SOURCES, v.168, no.2, pp.546 - 552 JOURNAL OF POWER SOURCES 168 2 546 552 N scie scopus 000247055200031 2-s2.0-34247565015 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article HYDROUS RUTHENIUM OXIDE CHARGE STORAGE MECHANISM ACTIVATED CARBON ELECTROCHEMICAL CHARACTERIZATION CAPACITIVE PERFORMANCE COMPOSITES PSEUDOCAPACITANCE NANOPARTICLES NANOTUBES AEROGELS supercapacitor hydrous ruthenium oxide vapour-grown carbon fibre electrochemical capacitor capacity retention morphology