A Facile Method to Prepare Three‐Dimensional Fe2O3/Graphene Composites as the Electrode Materials for Supercapacitors
A Facile Method to Prepare Three‐Dimensional Fe2O3/Graphene Composites as the Electrode Materials for Supercapacitors
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DOI：
10.1002/cjoc.201500700
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发表时间：
2016
影响因子：
5.4
通讯作者：
Jifeng Wu;An’an Zhou;Zhifeng Huang;Lei Li;H. Bai
中科院分区：
文献类型：
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作者：
Jifeng Wu;An’an Zhou;Zhifeng Huang;Lei Li;H. Bai
金属氧化物是一类重要的超级电容器电极材料。本文报道了三维（3D） Fe2O3/化学转化石墨烯复合材料的制备及其在超级电容器中的应用。在温和的条件下，通过氧化石墨烯和Fe2+的一步反应合成了复合材料。在反应过程中，氧化石墨烯薄片被还原并自组装成三维网络，而Fe2+转化为Fe2O3并沉积在石墨烯网络上。这种结构有利于电解液的扩散和Fe2O3与集流器之间的电子转移，从而使复合材料具有较高的电容性能。与饱和甘汞电极相比，在0 - 1 V的工作电位下，Fe2O3/化学转化石墨烯复合材料的比电容高达264 F·g−1 （2.5 A·g−1）。同时，复合材料具有良好的循环稳定性，循环5000次后电容保持率为95.7%。本研究为非对称超级电容器正极材料的制备提供了一种简便的方法。
Metal oxides comprise an important class of electrode materials for supercapacitors. In this paper, we report the preparation of three-dimensional (3D) Fe2O3/chemically converted graphene composites and their application in supercapacitors. The composites are synthesized via a one-step reaction between graphene oxide and Fe2+ at a mild condition. During the reaction graphene oxide sheets are reduced and self-assemble into a 3D network, while Fe2+ is converted into Fe2O3 and deposited onto the graphene network. This structure facilitates the diffusion of the electrolyte and the electron transfer between Fe2O3 and the current collector, thus endows the composites with high capacitive performance. A high specific capacitance of 264 F·g−1 (2.5 A·g−1) at the working potential of 0–−1 V vs. saturated calomel electrode is achieved on the Fe2O3/chemically converted graphene composites. Meanwhile, the composites show good cycling stability, with capacitance retention of 95.7% after 5000 cycles. This work provides a facile method to fabricate cathode materials for asymmetric supercapacitors.