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보조에너지원으로서의 수퍼커패시터용 나노전극소재로서의 탄소/망간산화물의 전기화학적 특성
안균영(Ahn, Kyun-Young),마상복(Ma, Sang-Bok),김광범(Kim, Kwang-Bum) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
Birnessite-type manganese dioxide(MnO₂) was coated uniformly onto carbon nanotubes (CNTs) through a spontaneous direct redox reaction between CNTs and permanganate ions(MnO₄;^-). The initial specific capacitance of the MnO₂/CNT nanocomposite in an organic electrolyte at a large current density of 1 A/g was 250 F/g, which is equivalent to 139 mAh/g based on the total weight of the electrode material including the electroactive material, conducting agent and binder. The specific capacitance of the MnO₂ in the MnO₂/CNT nanocomposite was as high as 580 F/g (320 mAh/g), indicating excellent electrochemical utilization of the MnO₂. The addition of CNTs as a conducting agent can improve the high rate capability of MnO₂/CNT nanocomposite considerably. An analysis of the in-situ X-ray absorption near-edge structure (XANES) showed an improvement in the structural and electrochemical reversibility of the MnO₂/CNT nanocomposite by heat-treatment.