Abstract
Thanks to the advanced technologies for energy generation such as solar cells and thermo- or piezo-generators the amount of electricity transformed from light, heat or mechanical pressure sources can be significantly enhanced. However, there is still a demand for effective storage devices to conserve electrical energy which addresses the wide range of large stationary applications from electric vehicles to small portable devices. Among the large variety of energy-storage systems available today, electrochemical energy sources and, in particular, supercapacitors (SC), are rather promising in terms of cost, scaling, power management, life cycle and safety. Therefore, this review surveys recent achievements in the development of SC based on composites of such carbon-derived materials as graphene (G) and reduced graphene oxide (rGO) with carbon nanotubes (CNT). Various factors influencing the specific capacitance are discussed, while specific energy and power as well as cycling stability of SC with G/rGO-CNT composite electrode materials are overviewed.
Highlights
Besides the energy transformation, energy storage is one of the most important topics of scientific research today
Specific capacitance of 132 F/g was reported by Lee et al for reduced graphene oxide (rGO)-carbon nanotubes (CNT) with 11 wt.% CNT prepared on glassy carbon electrode among other composites with CNT concentration varied from 6 to 50 wt.% [26]
The high-quality monolayer of graphene shows great potential for different applications such as miniaturized and precise micro/nano electronics, while chemically or/and thermally reduced graphene oxide provides a practical route towards lower-cost production of different rGO-based devices, supercapacitors
Summary
Energy storage is one of the most important topics of scientific research today. Of different carbonaceous materials area (SSA), electrical conductivity (σ) and specific capacitance (Csp) of different carbonaceous masuch as activated carbon, graphene and single-wall carbon nanotubes (SWCNT). A readily area is known to increase of the CNT diameter, single-wall nano-area accessible surface area as with well decrease as high conductivity Stack in bundles outermost oms are of notCNT involved the process From another side, pristinethe with carbon preserved elec- are portion can in function for ion absorption, whereas inner atoms tronic structures canprocess. There are was found to be a promising material for SC based on a simulation, which claimed its a number of publications on G/rGO-CNT composites with different final parameters as capacitance decreases with increasing oxidation state [11]. Electrode materials for energy storage applications, many of which are reviewed and analysed in this work
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