Achieving high specific charge capacitances in Fe3O4/reduced graphene oxide nanocomposites
Achieving high specific charge capacitances in Fe3O4/reduced graphene oxide nanocomposites
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DOI：
10.1039/c0jm03175e
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发表时间：
2011-01-01
影响因子：
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通讯作者：
Yan, Qingyu
中科院分区：
文献类型：
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作者：
Shi, Wenhui;Zhu, Jixin;Yan, Qingyu
我们报告了一种简便的方法来合成纳米复合材料与Fe 3 O 4纳米颗粒（NPs）连接到还原氧化石墨烯（rGO）片通过溶剂热过程，它结合了Fe 3 O 4 NPs的生长和还原的氧化石墨烯在一个单一的步骤。这些Fe 3 O 4/rGO纳米复合材料进一步用于制造薄膜超级电容器电极，通过使用喷雾沉积技术，而不添加绝缘粘合剂。结果发现，Fe 3 O 4/rGO纳米复合材料显示出比纯rGO或纯Fe 3 O 4纳米颗粒高得多的比电容。我们进一步对不同Fe 3 O 4：rGO重量比的Fe 3 O 4/rGO纳米复合材料进行了电化学表征（例如I-Fe 3 O 4：rGO），并显示具有I-Fe 3 O 4：rGO 2.8在放电电流密度为5 A g（-1）时表现出最高的比电容480 F g（-1），相应的能量密度为67 W h kg（-1）。1）在5506 W kg（-1）的功率密度。这些Fe 3 O 4/rGO纳米复合材料也显示出稳定的循环性能，在1000次充电/放电循环后，比电容没有任何降低。
We report a facile approach to synthesize nanocomposites with Fe3O4 nanopaticles (NPs) attached to reduced graphene oxide (rGO) sheets by a solvothermal process, which combines the growth of Fe3O4 NPs and the reduction of GOs in one single step. These Fe3O4/rGO nanocomposites were further used to fabricate thin film supercapacitor electrodes by using a spray deposition technique without the addition of insulating binders. It was found that the Fe3O4/rGO nanocomposites showed much higher specific capacitances than that of either pure rGO or pure Fe3O4 NPs. We further carried out electrochemical characterization of the Fe3O4/rGO nanocomposites with different Fe3O4 : rGO weight ratios (e.g. I-Fe3O4 : rGO) and showed that Fe3O4/rGO nanocomposites with I-Fe3O4 : rGO 2.8 exhibited the highest specific capacitance of 480 F g(-1) at a discharge current density of 5 A g(-1) with the corresponding energy density of 67 W h kg(-1) at a power density of 5506 W kg(-1). These Fe3O4/rGO nanocomposites also showed stable cycling performance without any decrease in the specific capacitance after 1000 charge/discharge cycles.