纳米结构磁铁矿及磁铁矿/碳纳米复合电化学薄膜的合成与表征

S. Pang, Wai-Hwa Khoh
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引用次数: 0

摘要

分别采用共沉淀法、简单法、易沉淀法和水基化学沉淀法制备了稳定的磁铁矿胶体悬浮液和磁铁矿/淀粉纳米复合材料。在受控条件下,通过滴涂后热处理的方法在不锈钢载体上制备纳米磁铁矿薄膜(图1),研究了煅烧温度和气氛对纳米磁铁矿薄膜微观结构和电化学性能的影响。在可控条件下对淀粉组分进行热处理碳化后,磁铁矿/淀粉纳米复合材料形成磁铁矿/碳纳米复合薄膜(图1)。发现原生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的比电容值为82 F/g in在1.0 M Na2SO4的温和水溶液中(图3),磁铁矿/碳纳米复合薄膜在相同的温和水溶液中获得124 F/g的比电容。由于其高电荷容量,良好的循环可逆性和在温和的水电解质中的稳定性,纳米颗粒磁铁矿和磁铁矿/碳纳米复合薄膜似乎是非常有前途的电极材料,用于制造电荷存储器件,特别是电化学电容器。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Synthesis and characterization of nanostructured magnetite and magnetite/carbon nanocomposite thin films for electrochemical applications
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.
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