Graphene/carbon nanotube composites not exhibiting synergic effect for supercapacitors: The resulting capacitance being average of capacitance of individual components

Buglione, Lucia; Pumera, Martin

doi:10.1016/j.elecom.2012.01.018

Cited by 43 publications

(38 citation statements)

References 13 publications

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“…The values for MWNT and RGO are ten times higher than that reported by Pumera who disperse MWNT and RGO with DMF [16] but are in concordance with our previous results for MWNT and MWNT-OX using the same experimental conditions [13]. The values of capacitances are similar for the CNMs excepting that obtained for GO.…”

Section: Resultssupporting

confidence: 93%

A comparative study of electrochemical performances of carbon nanomaterial-modified electrodes for DNA detection. Nanotubes or graphene?

Báez

Bollo

2015

J Solid State Electrochem

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Artículo de publicación ISIA comparative study about the electrochemical response of glassy carbon electrode modified with four different carbon nanomaterial (CNM) against dsDNA is reported. The CNM used were oxidized and nonoxidized multiwalled carbon nanotubes (MWNT-OX and MWNT, respectively), graphene oxide (GO) and chemically reduced graphene oxide (RGO) and dispersed in 3:1 chitosan/water mixture. The electrodes were characterized by cyclic voltammetry, scanning electrochemical microscopy, and contact angle measurements. The results showed that the type and degree of oxidation have a strong effect on the electroactivity of the modified electrode. GCE/RGO clearly exhibited the most electroactive surface among the CNMs, demonstrating that the graphitic structure is highly important. A more sensitive electrochemical response against dsDNA was obtained when GCE/RGO electrode was used. Therefore, RGO is the CNM recommended for further consideration in the development of DNA biosensors.National Fund for Scientific and Technological Development-CHILE FONDECYT 1120246 FONDAP 15130011 Chile's National Commission for Scientific and Technological Research (CONICYT

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Section: Resultssupporting

confidence: 93%

A comparative study of electrochemical performances of carbon nanomaterial-modified electrodes for DNA detection. Nanotubes or graphene?

Báez

Bollo

2015

J Solid State Electrochem

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“…[ 687 ] Buglione et al demonstrated that no synergistic effect or enhanced capacitance is obtained in a graphene -CNT composite, the total capacitance being just the sum of specifi c capacitances of individual components. [ 688 ] Thus, despite announced great potential, it is still unclear if graphene and its derivatives will revolutionize the energy storage fi eld or eventually fi nd niche applications. [ 689,690 ] …”

Section: Graphene-inside Batteries and Capacitorsmentioning

confidence: 99%

Design Considerations for Unconventional Electrochemical Energy Storage Architectures

Vlad

Singh

Galande

et al. 2015

Advanced Energy Materials

300

204

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all need to be used in conjugation with an energy storage system to provide smooth power leveling. Currently, electrochemical energy storage systems are by far the most optimal solutions for powering a broad range of technologies, expanding from compact and light-weighted portable electronic devices to stationary gridscale energy storage applications. [3][4][5][6] These energy storage devices (batteries and supercapacitors) store the available electrical energy in the form of chemical energy and release it whenever needed, by simply reversing the electrochemical reaction. [7][8][9][10][11] Among various available battery chemistries, lithium batteries and supercapacitors are the most promising technologies. [ 7,[9][10][11][12][13][14][15][16][17][18][19][20] Ever since the realization of the fi rst electrochemical energy storage cell by Alessandro Volta (end of 17th century), the working principle and its function has changed very little. [ 21,22 ] Basically, two redox couples (or charge storage electrodes), electrically and physically separated, are bridged by an ion conducting medium to constitute an electrochemical cell. This holds true also for modern Li-ion batteries, although the chemistry involved is much more complex. During operation, the electrons are transferred through an external circuit while ions shuttle through the electrolyte to counterbalance the depleted charge at the electrodes. [ 23 ] So far, much of the effort has been directed towards improvement of the energy and power characteristics by downsizing the active components, re-engineering the current collectors and separators, as well as fi ne-tuning the Batteries have become fundamental building blocks for the mobility of modern society. Continuous development of novel battery chemistries and electrode materials has nourished progress in building better batteries. Simultaneously, novel device form factors and designs with multi-functional components have been proposed, requiring batteries to not only integrate seamlessly to these devices, but to also be a multi-functional component for a multitude of applications. Thus, in the past decade, along with developments in the component materials, the focus has been shifting more and more towards novel fabrication processes, unconventional confi gurations, and additional functionalities. This work attempts to critically review the developments with respect to emerging electrochemical energy storage confi gurations, including, amongst others, paintable, transparent, fl exible, wire or cable shaped, ultra-thin and ultra-thick confi gurations, as well as hybrid energy storage-conversion, or graphene-incorporated batteries and supercapacitors. The performance requirements are elaborated together with the advantages, but also the limitations, with respect to established electrochemical energy storage technologies. Finally, challenges in developing novel materials with tailored properties that would allow such confi gurations, and in designing easier manufacturing techniques that can be widely adopted ar...

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“…247 There is little reason to believe that a breakthrough in energy storage will be achieved by simply combining graphene with other electroactive nanomaterials. Studies of this mechanism have demonstrated that the interfacial capacitance of graphene can be influenced by the quantum capacitance, the electronic properties of GSs and the charged state.…”

Section: (I) Investigation Of Charge Storage Mechanismsmentioning

confidence: 99%

Structural design of graphene for use in electrochemical energy storage devices

et al. 2015

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There are many practical challenges in the use of graphene materials as active components in electrochemical energy storage devices. Graphene has a much lower capacitance than the theoretical capacitance of 550 F g(-1) for supercapacitors and 744 mA h g(-1) for lithium ion batteries. The macroporous nature of graphene limits its volumetric energy density and the low packing density of graphene-based electrodes prevents its use in commercial applications. Increases in the capacity, energy density and power density of electroactive graphene materials are strongly dependent on their microstructural properties, such as the number of defects, stacking, the use of composite materials, conductivity, the specific surface area and the packing density. The structural design of graphene electrode materials is achieved via six main strategies: the design of non-stacking and three-dimensional graphene; the synthesis of highly packed graphene; the production of graphene with a high specific surface area and high conductivity; the control of defects; functionalization with O, N, B or P heteroatoms; and the formation of graphene composites. These methodologies of structural design are needed for fast electrical charge storage/transfer and the transport of electrolyte ions (Li(+), H(+), K(+), Na(+)) in graphene electrodes. We critically review state-of-the-art progress in the optimization of the electrochemical performance of graphene-based electrode materials. The structure of graphene needs to be designed to develop novel electrochemical energy storage devices that approach the theoretical charge limit of graphene and to deliver electrical energy rapidly and efficiently.

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Graphene/carbon nanotube composites not exhibiting synergic effect for supercapacitors: The resulting capacitance being average of capacitance of individual components

Cited by 43 publications

References 13 publications

A comparative study of electrochemical performances of carbon nanomaterial-modified electrodes for DNA detection. Nanotubes or graphene?

A comparative study of electrochemical performances of carbon nanomaterial-modified electrodes for DNA detection. Nanotubes or graphene?

Design Considerations for Unconventional Electrochemical Energy Storage Architectures

Structural design of graphene for use in electrochemical energy storage devices

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