Supercapacitive properties of composite electrodes consisting of polyaniline, carbon nanotube, and RuO2 |
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| Authors: | Jang Myoun Ko Kwang Sun Ryu Sanghyo Kim and Kwang Man Kim |
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| Affiliation: | (1) Department of Applied Chemistry & Biotechnology, Hanbat National University, Yusong, Daejeon, 305-719, South Korea;(2) Department of Chemistry, Ulsan University, Ulsan, 680-749, South Korea;(3) College of Bionanotechnology, Kyungwon University, Seongnam, Gyeonggi, 461-701, South Korea;(4) Research Team of Next-Generation Energy Technology, Electronics and Telecommunications Research Institute (ETRI), Yusong, Daejeon, 305-700, South Korea |
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| Abstract: | Three types of composite supercapacitor electrodes were prepared; electroactive polyaniline (PANI), PANI/multi-walled carbon
nanotube (CNT), and PANI/CNT/RuO2. Specifically, the PANI and PANI/CNT were prepared by polymerization, and PANI/CNT/RuO2 was prepared by electrochemical deposition of RuO2 on the PANI/CNT matrix. Cyclic voltammetry between −0.2 and 0.8 V (vs. Ag/AgCl) at various scan rates was performed to investigate
the supercapacitive properties in an electrolyte solution of 1.0 M H2SO4. The PANI/CNT/RuO2 electrode showed the highest specific capacitance at all scan rates (e.g., 441 and 392 F g−1 at 100 and 1,000 mV s−1, respectively). In contrast, the PANI/CNT electrode demonstrated the best capacitance retention (66%) after 104 cycles. Additional analysis including morphology and complex impedance spectroscopy suggested that with small loading of
RuO2, an increase in capacitance was observed, but dissolution and/or detachment of RuO2 species from the electrode might occur during cycling to reduce the cycle performance. |
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| Keywords: | Polyaniline Carbon nanotube Ruthenium oxide Supercapacitor |
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