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首页> 外文会议>2010 International Conference on Enabling Science and Nanotechnology >Synthesis and characterization of nanostructured magnetite and magnetite/carbon nanocomposite thin films for electrochemical applications
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Synthesis and characterization of nanostructured magnetite and magnetite/carbon nanocomposite thin films for electrochemical applications

机译：纳米结构磁铁矿和电化学/磁铁矿/碳纳米复合薄膜的合成与表征

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Stable colloidal suspensions of magnetite and magnetite/starch nanocomposite prepared by the co-precipitation method, and a simple, facile and aqueous-based chemical precipitation method, respectively. Nanoparticulate magnetite thin films on supporting stainless steel plates were prepared by drop-coating followed by heat treatment under controlled conditions (Fig. 1). The effects of calcination temperature and atmosphere on the microstructure and electrochemical properties of nanoparticulate magnetite thin films were investigated. Magnetite/carbon nanocomposite thin films were formed from the magnetite/starch nanocomposites after the starch component was carbonized by heat treatment under controlled conditions (Fig. 1). The initial content of native sago starch was found to affect the microstructure and electrochemical properties of the resulting magnetite/carbon nanocomposite thin films (Fig. 2). Nanoparticulate magnetite thin films prepared under optimized conditions exhibited a specific capacitance value of 82 F/g in mild aqueous solution of 1.0 M Na2SO4 (Fig. 3). A specific capacitance of 124 F/g was achieved for the magnetite/carbon nanocomposite thin films in the same mild aqueous electrolyte. Due to their high charge capacity, good cycling reversibility and stability in a mild aqueous electrolyte, nanoparticulate magnetite and magnetite/carbon nanocomposite thin films appear to be very promising electrode materials for the fabrication of charge-storage devices, in particular, electrochemical capacitors.
机译：通过共沉淀法，简单，简便和水基化学沉淀法制得的磁铁矿和磁铁矿/淀粉纳米复合材料的稳定胶体悬浮液。支撑不锈钢板上的纳米颗粒磁铁矿薄膜是通过滴涂法，然后在受控条件下进行热处理而制备的（图1）。研究了煅烧温度和气氛对纳米颗粒磁铁矿薄膜微观结构和电化学性能的影响。在受控条件下通过热处理将淀粉成分碳化后，由磁铁矿/淀粉纳米复合材料形成磁铁矿/碳纳米复合材料薄膜。发现天然西米淀粉的初始含量会影响所得磁铁矿/碳纳米复合薄膜的微观结构和电化学性能（图2）。在优化条件下制备的纳米颗粒磁铁矿薄膜在1.0 M Na 2 SO 4 的温和水溶液中显示出82 F / g的比电容值（图3）。在相同的温和水性电解质中，磁铁矿/碳纳米复合薄膜的比电容为124 F / g。由于它们的高充电容量，良好的循环可逆性和在温和的水性电解质中的稳定性，纳米颗粒磁铁矿和磁铁矿/碳纳米复合薄膜似乎是用于制造电荷存储设备（特别是电化学电容器）的非常有前途的电极材料。

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