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      저자 : Jeng-Shin Ma (검색결과 2 건)
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        Synthesis and characterization of nickel–manganese oxide via the hydrothermal route for electrochemical capacitors

        Chung-Hsien Wu,Jeng-Shin Ma,Chung-Hsin Lu 한국물리학회 2012 Current Applied Physics Vol.12 No.4

        Nano-sized and well dispersed manganese oxide and nickelemanganese oxide (NieMneO) powders are synthesized via the hydrothermal route. The addition of nickel ions significantly affects the morphology,particle size and the electrochemical properties of the obtained powders. Adding nickel ions results in a significant change in the shape of the powders from rod-like to plate-like. The electrochemical analysis of the electrode reveals that the specific capacitance of the synthesized powders is greatly increased with the addition of nickel ions. When the hydrothermal temperature is increased to 125 ℃, the specific capacitance also increases to 284 F/g and decreases by about 4% after 1500 cycles of charge and recharge. NieMneO is considered to be a promising material for the electrodes used in electrochemical capacitors. Nano-sized and well dispersed manganese oxide and nickelemanganese oxide (NieMneO) powders are synthesized via the hydrothermal route. The addition of nickel ions significantly affects the morphology,particle size and the electrochemical properties of the obtained powders. Adding nickel ions results in a significant change in the shape of the powders from rod-like to plate-like. The electrochemical analysis of the electrode reveals that the specific capacitance of the synthesized powders is greatly increased with the addition of nickel ions. When the hydrothermal temperature is increased to 125 ℃, the specific capacitance also increases to 284 F/g and decreases by about 4% after 1500 cycles of charge and recharge. NieMneO is considered to be a promising material for the electrodes used in electrochemical capacitors.

      • KCI등재

        Effects of reducing agents on the electrochemical properties of the prepared manganese oxide powders

        Chung-Hsien Wu,Jeng-Shin Ma,Chung-Hsin Lu 한국물리학회 2012 Current Applied Physics Vol.12 No.4

        Manganese oxide powders with high specific capacitance were successfully fabricated via a simple redox reaction at room temperature. The reducing agents used for the redox reaction significantly affected the oxidation states and the electrochemical properties of the prepared manganese oxide powders. As C2H5OH was used as the reducing agent, high Mn3+ content and high amount of hydroxide were observed in the prepared manganese oxide powders. In addition, the molar ratios of KMnO4 and C2H5OH also influenced the electrochemical properties of the prepared manganese oxide powders. When the molar ratio of KMnO4 and C2H5OH was 1:40, the specific capacitance of the prepared manganese oxide was as high as 402 F/g. These results of the electrochemical analysis showed that, adjusting the molar ratios of KMnO4 and C2H5OH demonstrated to be an effective method for controlling the electrochemical characteristics of manganese oxide powders.

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