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Preparation of rGO-wrapped magnetite nanocomposites and their energy storage properties

机译：rGO包裹磁铁矿纳米复合材料的制备及其储能性能

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Porous reduced graphene oxide (rGO)/Fe3O4 nanocomposites have been prepared in this study by a simple precipitation reaction followed by freeze drying. When the sample was dried at 80 degrees C, spinel phase of Fe3O4 wrapped by rGO sheets was obtained without any detectable impurities. It exhibits a high surface area of 30 m(2) g(-1). The rGO/Fe3O4 composites were also annealed under different conditions such as 600 degrees C in Ar, 700 degrees C in Ar and 700 degrees C in Ar-H-2 to understand the effect of annealing temperature on the electrochemical properties. The rGO content in the samples was found to be similar to 3-4% in all the composites from CHNS analysis. Electrochemical properties of the different composites were investigated by cyclic voltammetry, galvanostatic cycling and electrochemical impedance spectroscopy studies. The composite prepared at 80 degrees C exhibits very high capacity of 1254 mA h g -1 for the first charge cycle. However, the capacity faded to 1046 mA h g(-1) at the end of 40 cycles. Though the high temperature annealed samples show slightly decreased capacity, they show excellent capacity retention with good rate capability. The rGO/Fe3O4 composite obtained at 700 degrees C in Ar-H-2 exhibits high reversible capacity of 480 mA h g(-1) at a high current density of 3000 mA g(-1).
机译：在本研究中，通过简单的沉淀反应，然后冷冻干燥，制备了多孔还原氧化石墨烯（rGO）/ Fe3O4纳米复合材料。当样品在80℃下干燥时，获得了被rGO片包裹的Fe 3 O 4的尖晶石相，而没有任何可检测到的杂质。它展现出30 m（2）g（-1）的高表面积。还对rGO / Fe3O4复合材料在不同条件下进行了退火，例如在Ar中600摄氏度，Ar中700摄氏度和Ar-H-2中700摄氏度，以了解退火温度对电化学性能的影响。根据CHNS分析，在所有复合材料中，样品中的rGO含量均接近3-4％。通过循环伏安法，恒电流循环法和电化学阻抗谱研究研究了不同复合材料的电化学性能。在80摄氏度下制备的复合材料在第一个充电周期中显示出非常高的1254 mA h g -1容量。但是，在40个循环结束时，容量下降至1046 mA h g（-1）。尽管高温退火的样品显示出略微降低的容量，但是它们显示出优异的容量保持性和良好的速率性能。在Ar-H-2中在700摄氏度下获得的rGO / Fe3O4复合材料在3000 mA g（-1）的高电流密度下显示出480 mA h g（-1）的高可逆容量。

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