Supercapacitive properties of electrodeposited RuO2 electrode in acrylic gel polymer electrolytes |
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Authors: | Kwang Man Kim Ji Hyun Nam Young-Gi Lee Won Il Cho Jang Myoun Ko |
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Affiliation: | 1. Research Section of Power Control Devices, Electronics and Telecommunications Research Institute (ETRI), Daejon 305-700, Republic of Korea;2. Department of Chemical and Biological Engineering, Hanbat National University, Daejon 305-719, Republic of Korea;3. Energy Storage Research Center, Korea Institute of Science and Technology, Seoul 130-165, Republic of Korea |
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Abstract: | Hydrous ruthenium oxide (RuO2) is prepared by electrodeposition on a platinum substrate and its supercapacitive properties are characterized adopting acrylic gel polymer electrolytes, such as poly(acrylic acid) (PAA), potassium polyacrylate (PAAK), and poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS). The electrodeposited hydrous RuO2 exhibits an amorphous compact stratified morphology with a higher loading (0.15 mg cm?2) than that of a previous report, and shows broad redox peaks on both cathodic and anodic scans in the cyclic voltammetry. In particular, the RuO2 electrode for supercapacitor adopting the PAMPS electrolyte shows the highest specific capacitance of 642 F g?1 at 20 mV s?1. This is due to the efficient utilization of active RuO2 species and greater proton accommodation toward the negative oxygen sites of PAMPS's side chain. In addition, it is possible to improve sustainability against high-rate current with the RuO2 electrode with the PAMPS electrolyte, due to the crosslinks of the gel electrolyte, which support the mechanical strength. |
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Keywords: | Ruthenium oxide Acrylic gel polymer electrolyte Supercapacitor Cyclic voltammetry |
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