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Received January 21, 2009
Accepted January 31, 2009
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단일벽 탄소나노튜브 상에 석출된 산화루테늄과 루테늄-코발트 혼합산화물의 수퍼커패시터 특성
Supercapacitive Properties of RuO2 and Ru-Co Mixed Oxide Deposited on Single-Walled Carbon Nanotube
한밭대학교 응용화학생명공학부, 305-719 대전광역시 유성구 덕명동 산16-1 1한국전자통신연구원 융합부품소재 연구부문 차세대에너지기술팀, 305-700 대전광역시 유성구 가정로 138
Department of Applied Chemistry & Biotechnology, Hanbat National University, San 16-1, Duckmyoung-dong, Yuseong-gu, Daejeon 305-719, Korea 1Research Team of Next-Generation Energy Technology, Electronics & Telecommunications Research Institute (ETRI), 138 Gajeongno, Yuseong-gu, Daejeon 305-700, Korea
kwang@etri.re.kr
Korean Chemical Engineering Research, February 2009, 47(1), 11-16(6), NONE Epub 27 February 2009
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Abstract
단일벽 탄소나노튜브의 표면 위에 동력학적 전위법으로 산화루테늄(RuO2)의 석출 및 루테늄-코발트 혼합산화물(Ru-Co mixed oxide)의 공석출에 의해 산화환원 수퍼커페시터용 복합전극을 제조하였다. 루테늄 성분이 13.13 wt%, 코발트 성분이 2.89 wt%가 석출된 Ru-Co 혼합산화물 전극은 낮은 전위 스캔속도(10 mV s-1)에서는 RuO2 전극과 유사한 비용량(~620 F g-1)을 나타내지만, 높은 스캔속도(500 mV s-1)에서는 RuO2 전극보다 큰 비용량을 보인다. 높은 스캔 속도에서 Ru-Co 혼합산화물 전극이 비용량의 증가를 나타내는 것은 Ru 성분을 통한 전기전도성을 Co 성분이 구조적으로 지지해주기 때문이다.
Composite electrodes for redox supercapacitor were prepared potentiodynamically by the deposition of RuO2 and the co-deposition of Ru-Co mixed oxide on the surface of single-walled carbon nanotube. Electrode of Ru-Co mixed oxide, in which Ru(13.13 wt%) and Co(2.89 wt%) were deposited on the carbon nanotube, exhibited a similar specific capacitance(~620 F g-1) with RuO2 electrode at a low potential scan rate(10 mV s-1), but showed a superior one (570 F g-1) at a high scan rate(500 mV s-1) than that of RuO2(475 F g-1). Such increase in the specific capacitance at high scan rate by the co-deposition of Ru and Co species was due to the structural support of Co species to provide the electronic conduction through Ru species.
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