Prussian blue derived iron oxide nanoparticles wrapped in graphene oxide sheets for electrochemical supercapacitors
Prussian blue derived iron oxide nanoparticles wrapped in graphene oxide sheets for electrochemical supercapacitors
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DOI：
10.1039/c7ra03179c
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发表时间：
2017-07
期刊：
影响因子：
3.9
通讯作者：
S. Tanaka;R. R. Salunkhe-R.;Y. V. Kaneti;Victor Malgras;S. Alshehri;T. Ahamad;Mohamed Barakat Zakaria;S. Dou;Y. Yamauchi;M. S. Hossain
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作者：
S. Tanaka;R. R. Salunkhe-R.;Y. V. Kaneti;Victor Malgras;S. Alshehri;T. Ahamad;Mohamed Barakat Zakaria;S. Dou;Y. Yamauchi;M. S. Hossain
由于两个(或更多)组分的综合性能或优点，杂化材料在储能应用方面显示出了巨大的潜力，例如超级电容器。在这项工作中，我们报告了一种新的复合材料的制备，它将氧化石墨烯(GO)片与普鲁士蓝(PB)纳米颗粒结合在一起，作为氧化铁(IO)的前驱体。不同GO：PB比例的GO/PB复合前驱体通过400℃空气中的热处理可以成功地转化为纳米孔GO/IO杂化复合材料。在所得到的GO/IO复合材料中，由于IO层的插入，GO片层被有效地隔开。有趣的是，与纯GO(34.9m2 g−1)和IO(93.1m2 g−1)相比，GO/IO(GO：PB=25：75)具有更高的比表面积120m2g−1。当用作超级电容器电极时，GO/IO混合电极(GO：PB=75：25)在20 mV S−1的扫描速度下，比电容为91Fg−1，高于纯GO(81Fg−1)和纯IO(47Fg−1)。GO/IO杂化电极的增强电化学性能可以归因于在GO层之间插入IO纳米颗粒，这为电解液和离子创建了一条间隔良好的电传输路径，同时还使得电解液能够容易地接近整个电极表面。此外，由于导电性的改善，GO/IO杂化复合材料中GO的存在有助于降低IO的电阻率，增加混合体的比电容值。
Hybrid materials have shown promising potential for energy storage applications, such as supercapacitors due to the combined properties or advantages of two (or more) individual constituents. In this work, we report the fabrication of a new composite which combines graphene oxide (GO) sheets with Prussian blue (PB) nanoparticles, which act as a precursor for iron oxide (IO). The GO/PB composite precursors with different GO : PB ratios can be successfully converted into nanoporous GO/IO hybrid composites through a thermal treatment in air at 400 °C. In the resulting GO/IO composites, the GO sheets are efficiently spaced due to the insertion of IO layers. Interestingly, the GO/IO hybrid (GO : PB ratio = 25 : 75) exhibits a higher surface area of 120 m2 g−1 compared to pure GO (34.9 m2 g−1) and IO (93.1 m2 g−1) samples. When employed as a supercapacitor electrode, the GO/IO hybrid (prepared from GO : PB = 75 : 25) showed a higher specific capacitance of 91 F g−1 at a scan rate of 20 mV s−1, compared to pure GO (81 F g−1) and pure IO (47 F g−1). The enhanced electrochemical performance of the GO/IO hybrid electrode may be attributed to the insertion of IO nanoparticles in between the GO layers which creates a well-spaced electrical transportation path for electrolytes and ions, whilst also enabling easy access for the electrolytes to the whole electrode surface. Furthermore, the presence of GO in the GO/IO hybrid composite helps to lower the resistivity of IO and increase the specific capacitance value of the hybrid, as a result of the improved conductivity.