Functionalized Graphene-Based Nanocomposites for Supercapacitor Application
Functionalized Graphene-Based Nanocomposites for Supercapacitor Application
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DOI：
10.1021/jp201673e
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发表时间：
2011-07-28
影响因子：
3.7
通讯作者：
Ramaprabhu, Sundara
中科院分区：
文献类型：
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作者：
Mishra, Ashish Kumar;Ramaprabhu, Sundara
现代科技社会要求大规模使用和储存能源。在这方面，高性能超级电容器的开发是当前科学研究的重点。石墨烯由于其优异的性能，在超级电容器方面的应用备受关注。在本研究中，石墨烯是通过氢诱导剥离合成的，并通过化学途径进一步功能化以金属氧化物（RuO2， TiO2和Fe3O4）纳米粒子和聚苯胺装饰。材料通过电子显微镜、x射线衍射、傅里叶变换红外和拉曼光谱技术进行表征。利用循环伏安法和恒流充放电技术，研究了制备的石墨烯（HEG）、功能化石墨烯（f-HEG）、若o2 -f-HEG、TiO2-f-HEG、Fe3O4-f-HEG和聚苯胺（PANI =聚苯胺）纳米复合材料的电化学性能。以1 M H2SO4为电解液，电压扫描速率为10 mV/s时，HEG、F -HEG、RuO2-f-HEG、TiO2-f-HEG、Fe3O4-f-HEG和PANI-f-HEG纳米复合材料的最大比电容分别为80、125、265、60、180和375 F/g。即使在100mv /s的高电压扫描速率下，每种纳米复合材料的比电容也能保持高达85%。石墨烯及其纳米复合材料具有良好的电容性能，其制备工艺简单、成本效益高，有利于其商业化应用。
A modern technological society demands the use and storage of energy on a large scale. In this regard, the development of high performance supercapacitors is the focus of current scientific research. Graphene, due to its excellent properties, has attracted attention for supercapacitor applications. In the present work, graphene is synthesized via hydrogen-induced exfoliation and is further functionalized to decorate with metal oxide (RuO2, TiO2, and Fe3O4) nanoparticles and polyaniline using the chemical route. Materials are characterized by electron microscopy, X-ray diffraction, Fourier transform infrared, and Raman spectroscopy techniques. Electrochemical performance of as-prepared graphene (HEG), functionalized graphene (f-HEG), RuO2-f-HEG, TiO2-f-HEG, Fe3O4-f-HEG, and PANI-f-HEG (PANI = polyaniline) nanocomposites is examined using cyclic voltammetry and galvanostatic charge-discharge techniques for supercapacitor applications. A maximum specific capacitance of 80, 125, 265, 60, 180, and 375 F/g for HEG, f-HEG, RuO2-f-HEG, TiO2-f-HEG, Fe3O4-f-HEG, and PANI-f-HEG nanocomposites, respectively, is obtained with 1 M H2SO4 as the electrolyte at the voltage sweep rate of 10 mV/s. The specific capacitance for each nanocomposites sustains up to 85% even at higher voltage sweep rate of 100 mV/s. A simple and cost-effective preparation technique of graphene and its nanocomposites with good capacitive behavior encourages its commercial use.