Mishra Ashish Kumar, Ramaprabhu S
Alternative Energy and Nanotechnology Laboratory (AENL), Nano Functional Materials Technology Center (NFMTC), Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
J Nanosci Nanotechnol. 2012 Aug;12(8):6658-64. doi: 10.1166/jnn.2012.4542.
Recently, the focus on carbon based nanostructures for various applications has been due to their novel properties such as high electrical conductivity, high mechanical strength and high surface area. In the present work, we have investigated the charge storage capacity of modified graphite nanoplatelets and hybrid structure of graphite nanoplatelets-multiwalled carbon nanotubes (MWNTs). These MWNTs can be used as spacers to reduce the possibility of restacking of graphite nanoplatelets and hence increases the surface area of the hybrid carbon nanostructure thereby high degree of metal oxide decoration is achieved over the hybrid structure. MWNTs were prepared by catalytic chemical vapor deposition technique and further purified with air oxidation and acid treatment. Graphite was treated with conc. nitric acid and sulphuric acid in the volumetric ratio of 1:3 for 3 days and these modified graphite nanoplatelets were further stirred with MWNTs in equal weight ratio to form hybrid nanostructure. Further, ruthenium oxide (RuO2) nanoparticles were decorated on this hybrid structure using chemical route followed by calcination. RuO2 decorated hybrid carbon nanostructure was characterized by using X-ray diffraction, Electron microscopy and Raman spectroscopy. The performance of the hybrid structure based nanocomposite as electrochemical capacitor electrodes was analyzed by studing its capacitive and charge-discharge behaviours using cyclic voltammetry and chronopotentiometry techniques and the results have been discussed.
最近，基于碳的纳米结构因其诸如高导电性、高机械强度和高表面积等新颖特性而受到各种应用的关注。在本工作中，我们研究了改性石墨纳米片以及石墨纳米片 - 多壁碳纳米管（MWNTs）混合结构的电荷存储容量。这些多壁碳纳米管可用作间隔物，以降低石墨纳米片重新堆叠的可能性，从而增加混合碳纳米结构的表面积，进而在混合结构上实现高度的金属氧化物修饰。多壁碳纳米管通过催化化学气相沉积技术制备，并通过空气氧化和酸处理进一步纯化。石墨用体积比为1:3的浓硝酸和浓硫酸处理3天，然后将这些改性石墨纳米片与等重量比的多壁碳纳米管进一步搅拌以形成混合纳米结构。此外，通过化学方法随后进行煅烧，在这种混合结构上装饰氧化钌（RuO2）纳米颗粒。使用X射线衍射、电子显微镜和拉曼光谱对RuO2修饰的混合碳纳米结构进行了表征。通过使用循环伏安法和计时电位法技术研究其电容和充放电行为，分析了基于混合结构的纳米复合材料作为电化学电容器电极的性能，并对结果进行了讨论。
