251. Microwave synthesis of three dimensional graphene-based shell-plate hybrid nanostructures.
- Author
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Sridhar, Vadahanambi, Lee, Inwon, Yoon, Hyun-Sik, Chun, Ho-Hwan, and Park, Hyun
- Subjects
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MICROWAVES , *GRAPHENE synthesis , *NANOSTRUCTURES , *ELECTRIC properties of graphene , *SUPERCAPACITORS , *LITHIUM-ion batteries , *IONIC liquids , *SCANNING electron microscopy - Abstract
Abstract: Though free standing graphene has excellent physical, chemical and electrical properties, its tendency to restack is a major hurdle in realizing its full potential especially in applications such as lithium ion batteries and super capacitors. In this manuscript, we report synthesis of graphene-based three dimensional (3D) shell-plate nanostructures composed of ‘nano-cup arrays’ anchored on few-layered graphene (FLG) substrates. The synthesis was carried out by a simple process using eco-friendly ionic liquids and microwave irradiation as the energy source. Morphological studies by scanning electron microscopy and transmission electron microscopy showed vertically anchored graphene nano-cups on graphene substrate. Super capacitor electrodes fabricated with FLG/gCup nano-hybrids and its electrochemical properties are studied by cyclic voltammetry (CV) and galvanostatic charge/discharge (DC) methods. FLG/gCup electrodes showed good electrochemical performance, with a maximum specific capacitance of 421Fg−1 at the charge/discharge current density of 100mAg−1 in 1M KOH electrolyte, which is four times higher than pristine graphene sheets. The utility of our developed technique in synthesis of graphene nano-cup arrays on arbitrary surfaces (glass substrate) is also reported. [Copyright &y& Elsevier]
- Published
- 2013
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