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filed emission scanning electron microscope (FEI NanoLab600i SEM). Transmission electron microscope (TEM) was employed for a detailed analysis of dislocation morphologies, using a FEI Tecnai G2 F20C zech microscope equipped with high resolution transmission electron microscope (HR-TEM) and operated at 200 kV. TEM specimens were prepared by standard electrochemical polishing procedures. Microhardness......
电流密度下得到的容量低了11.67%.可能是石墨烯成分的比例不同所致.此外,在实验中还发现过渡金属氧化物电极经循环后容量有所上升的现象,这很可能是放电过程中电极物质逐步激活引起的[35].PARK等[36]通过水热法合成了Mn3O4/掺氮石墨烯复合负极材料.在HR-TEM下Mn3O4纳米分子镶嵌到石墨烯纳米片层中,扩大了石墨烯片层的间距,增加了石墨烯的比表面积,从而增加了石墨烯材料的储锂容量.而且...助水热法制备Fe2O3/石墨烯复合材料,并通过试验找到了最佳的石墨烯掺杂量.当石墨烯掺杂量为30%(质量分数),复合材料在50 mA/g的电流密度下充放电循环后50次后,可逆放电容量为1069 mA·h/g;当电流密度提高到1000 mA/g,可逆容量仍达到534 mA·h/g.通过SEM和TEM检测发现,Fe2O3分子被石墨烯分子片层包裹住,形成了分散性良好的电极微观结构.WU等[34]制备了......
of compressive residual strain experienced by the composite leading to the decrease in overall hardness and modulus of the composite. Fig. 13 Bright-field HR-TEM images (a, c, d), SAED pattern (b) and GATAN... and SiC by GNP particles. The GNP particles act as a bridge between the Al matrix and SiC particles, as shown in Fig. 7(b1). The bridging mechanism is also confirmed by using TEM analysis and discussed......