|
|||||
|
|
Electrochemical properties of manganese oxide coated onto carbon nanotubes for energy-storage applications |
|
| Authors: | Sang-Bok Ma Kyung-Wan Nam Won-Sub Yoon Xiao-Qing Yang Kyun-Young Ahn Ki-Hwan Oh Kwang-Bum Kim |
| Affiliation: | 1. Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemoon-gu, Seoul 120-749, South Korea;2. Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973, USA;3. Hyundai ECO Technology Research Institute, Yongin-Si, Gyeonggi-Do 446-912, South Korea;4. Next Generation Vehicle Technology, Seoul National University, Shinlim-dong, Kwanak-gu, Seoul 151-742, South Korea |
| Abstract: | Birnessite-type manganese dioxide (MnO2) is coated uniformly on carbon nanotubes (CNTs) by employing a spontaneous direct redox reaction between the 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−1 is 250 F g−1. This is equivalent to 139 mAh g−1 based on the total weight of the electrode material that includes the electroactive material, conducting agent and binder. The specific capacitance of the MnO2 in the MnO2/CNT nanocomposite is as high as 580 F g−1 (320 mAh g−1), indicating excellent electrochemical utilization of the MnO2. The addition of CNTs as a conducting agent improves the high-rate capability of the MnO2/CNT nanocomposite considerably. The in situ X-ray absorption near-edge structure (XANES) shows improvement in the structural and electrochemical reversibility of the MnO2/CNT nanocomposite after heat-treatment. |
| Keywords: | Manganese oxide Carbon nanotube Nanocomposite Electrochemical capacitor |
| 本文献已被 ScienceDirect 等数据库收录！ | |