SYNTHESIS AND ELECTROCHEMICAL PROPERTIES OF NANO FIBER HOLLANDITE-TYPE MANGANESE OXIDES USING A HYDROTHERMAL METHOD
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説明
<jats:p> Hollandite-type MnO<jats:sub>2</jats:sub> and its Co -substituted samples have been synthesized by hydrothermal method from MnSO<jats:sub>4</jats:sub> , CoSO<jats:sub>4</jats:sub> and K<jats:sub>2</jats:sub>S<jats:sub>2</jats:sub>O<jats:sub>8</jats:sub> solutions. The hydrothermal products from MnSO<jats:sub>4</jats:sub> and K<jats:sub>2</jats:sub>S<jats:sub>2</jats:sub>O<jats:sub>8</jats:sub> solutions consisted of the hollandite-type [2 × 2] tunnel structure at 100°C–150°C for 12 h, which was transformed to pyrolusite-type [1 × 1] tunnel structure by hydrothermal treatment at 150°C for longer times of 24–48 h or at a higher temperature of 180°C. On the other hand, the hydrothermal products from MnSO<jats:sub>4</jats:sub> , CoSO<jats:sub>4</jats:sub> and K<jats:sub>2</jats:sub>S<jats:sub>2</jats:sub>O<jats:sub>8</jats:sub> solutions at 150°C–180°C for 12–48 h consisted of the hollandite-type MnO<jats:sub>2</jats:sub> phase. The Co -substituted samples showed higher initial discharge capacity (180–200 mAh (g-oxide)<jats:sup>-1</jats:sup>) than that of non-substituted hollandite-type MnO<jats:sub>2</jats:sub> (130–160 mAh (g-oxide)<jats:sup>-1</jats:sup>) at 50 mA g<jats:sup>-1</jats:sup>. </jats:p>
収録刊行物
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- Functional Materials Letters
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Functional Materials Letters 05 1250004-, 2012-03-01
World Scientific Pub Co Pte Lt