Preparation and electrochemical performance of spherical MnOx with high capacitance
| Autor: | Heming Luo, Huixia Feng, Jianqiang Zhang, Yan-Xia Sun, Feng-Bo Zhang |
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| Rok vydání: | 2014 |
| Předmět: |
Diffraction
Materials science General Chemical Engineering Inorganic chemistry General Engineering General Physics and Astronomy chemistry.chemical_element Manganese Electrochemistry Capacitance law.invention Capacitor chemistry Chemical engineering law Transmission electron microscopy General Materials Science Calcination Current density |
| Zdroj: | Ionics. 20:1535-1546 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-014-1124-1 |
| Popis: | A promising electrode material, MnOx, was prepared by chemical precipitation method using MnSO4 · H2O as manganese source and (NH4)2CO3 as precipitant. The as-prepared manganese oxide was characterized by field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM), and X-ray diffraction (XRD), respectively. The effects of reaction temperature and calcination temperature on the electrochemical properties of the electrode materials were investigated. The results show that MnOx with a spherical morphology exhibits an excellent performance in the energy storage field. Under the optimal experimental conditions, the specific capacitance of pure MnOx reaches up to 592 F g−2 in the alkaline media when the current density is 5 mA cm−2 over the potential window from −0.3 to +0.4 V. The combination resistance and transfer resistance of MnOx are 0.86 and 0.08 Ω, respectively. These findings make MnOx a promising electrode material for electrochemical capacitors. |
| Databáze: | OpenAIRE |
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