Graphene/NiO nanowires: controllable one-pot synthesis and enhanced pseudocapacitive behavior.
Graphene/NiO nanowires: controllable one-pot synthesis and enhanced pseudocapacitive behavior.
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DOI：
10.1021/am500700x
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发表时间：
2014-05
影响因子：
9.5
通讯作者：
D. T. Dam;Xin Wang;Jong‐Min Lee
中科院分区：
文献类型：
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作者：
D. T. Dam;Xin Wang;Jong‐Min Lee
在这项研究中，我们报告了一种简便易行的方法来合成一种复合材料的介孔NiO纳米线和石墨烯纳米片的超级电容器的应用。通过一锅溶胶-凝胶法在含有氧化石墨烯的水/乙二醇混合物中制备Ni前体。在空气中进行热处理以将氧化石墨烯热还原为石墨烯并将Ni前体转化为NiO。NiO纳米线具有粗糙的表面，具有约60 nm的直径，并且均匀地沉积在石墨烯片上。NiO/石墨烯纳米复合材料与其对应物相比表现出上级的赝电容特性（高比电容、良好的循环性能和优异的放电倍率能力）。我们推测这种现象是由于添加石墨烯作为弹性导电通道的协同效应引起的，这导致了更好的电荷传输和更有利的离子扩散。
In this study, we report a facile and simple approach to synthesize a composite of mesoporous NiO nanowires and graphene nanosheets for supercapacitor applications. A Ni precursor was prepared by a one-pot sol-gel method in a water/ethylene glycol mixture containing a graphene oxide. Heat treatment in air was carried out to thermally reduce the graphene oxide to graphene and to convert the Ni precursor to NiO. NiO nanowires possess a rough surface, have a diameter of around 60 nm and are homogeneously deposited on the graphene sheets. The NiO/graphene nanocomposite demonstrates superior pseudocapacitive properties (high specific capacitance, good cyclic performance, and excellent discharge rate capability) as compared to its counterparts. We postulated that this phenomenon arose from the synergistic effect of the addition of graphene as elastic conductive channels, which resulted in better charge transport and more favorable ionic diffusion.