Abstract
Few-layer graphene films were synthesized through chemical vapor deposition technique using coal char as solid carbon source. Raman spectroscopy, X-ray diffraction, transmission electron microscopy, and selected area electron diffraction were used to characterize the graphene films. The electrochemical performance of the coal char derived few layer graphene anodes for lithium ion batteries was investigated by charge/discharge curves and discharge capacity at different current densities. The graphene anode maintained the reversible capacity at ~0.025, 0.013, and 0.007 mAh/cm2 at a current density of 10, 30, and 50 µA/cm2, respectively. The coal char derived graphene anodes show potential applications in thin film batteries for nanoelectronics.
Highlights
Graphene has been gaining much attention in the past decade due to its excellent physical/chemical properties and its uses in various potential applications ranging from electronics to composites and sensors [1,2,3,4,5,6]
The traditional chemical vapor deposition (CVD) methods require hydrocarbon gas as a carbon source, which limit the applications of this technology to various potential carbon feedstocks
The D band is attributed to defects in the graphene films and G band is due to the tangential vibrations of sp2 bonded carbon atoms
Summary
Graphene has been gaining much attention in the past decade due to its excellent physical/chemical properties and its uses in various potential applications ranging from electronics to composites and sensors [1,2,3,4,5,6]. CVD is the most promising method for Photonics 2014, 1 growing high quality and large area graphene films. Inspired by its superb electrical and optical properties, large specific surface area, and excellent chemical stability, the CVD grown graphene shows great potential in the applications of sensing [8,9], energy storage and generation [10,11], and corrosion science [12,13]. Solid carbon sources, such as poly(methyl methacrylate), sucrose, polystyrene, and amorphous carbon thin film have drawn interest for use as carbon sources in pristine graphene film growth using the CVD method [14,15,16]
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