Superparamagnetic Fe3O4 nanocrystals@graphene composites for energy storage devices
Superparamagnetic Fe3O4 nanocrystals@graphene composites for energy storage devices
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DOI：
10.1039/c0jm03717f
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发表时间：
2011-01-01
影响因子：
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通讯作者：
Warner, Jamie H.
中科院分区：
文献类型：
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作者：
Li, Baojun;Cao, Huaqiang;Warner, Jamie H.
以氧化石墨烯为前驱体，采用化学沉积法制备了Fe 3 O 4纳米晶/石墨烯复合材料（FGC）。我们还研究了FGC的结构、物理化学性质和应用，包括超顺磁性能，以及作为超级电容器和锂离子电池（LIB）的应用。结果表明，Fe 3 O 4纳米粒子在石墨烯片表面形成并结合。复合材料FGC具有微米级结构，具有与石墨烯片相似的尺寸，并在室温下表现出超顺磁性行为。FGC复合材料的超电容值比石墨烯片或Fe 3 O 4纳米粒子的大，这归因于Fe 3 O 4纳米粒子与石墨烯片之间的相互作用。同时，可以观察到用作LIB中的阳极材料的FGC的上级的可再充电稳定性。
In this paper, a Fe3O4 nanocrystals@graphene composite (FGC) was synthesized via a chemical deposition method by using graphene oxide as a precursor. We also investigate the structures, physicochemical properties and applications of FGCs, involving superparamagnetic performance, and use as supercapacitors and lithium ion battery (LIBs). The results showed that the Fe3O4 NCs were formed and incorporated onto the surface of the graphene sheets. The composite material FGC with a micrometre scale structure possessed similar size as the graphene sheets and exhibited superparamagnetic behavior at room temperature. The supercapacitance values of the FGC composites were enlarged compared with those of the graphene sheets or Fe3O4 NCs, which is attributed to the interaction between the Fe3O4 NCs and the graphene sheets. Meanwhile, a superior rechargeable stability of FGCs used as an anode material in LIBs can be observed.