Hybrid nanostructured materials for high-performance electrochemical capacitors

Yu, Guihua; Xie, Xing; Pan, Lijia; Bao, Zhenan; Cui, Yi

doi:10.1016/j.nanoen.2012.10.006

Cited by 982 publications

(478 citation statements)

References 116 publications

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“…Other recent reviews related to supercapacitor materials are available [105][106][107][108][109]. Many reported results refer to nanostructured carbon based materials and different related composites used for the manufacture of experimental supercapacitor electrodes.…”

Section: Discussionmentioning

confidence: 99%

Supercapacitors specialities - Materials review

Obreja

2014

AIP Conference Proceedings

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Section: Discussionmentioning

confidence: 99%

Supercapacitors specialities - Materials review

Obreja

2014

AIP Conference Proceedings

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“…19,20 Individual singular nanofibers of cellulose exhibit low CTE, which is comparable to quartz glass, and an outstanding Young's modulus, which is higher than that of aluminum and glass fibers. 21,22 Although dense aggregates of cellulose nanofibers (CNFs) can form flexible, transparent films for electronic devices, [23][24][25][26] there currently are still substantial challenges to the practical application of CNF films, such as (i) incompatibility with high-temperature processing (o200°C), 27 (ii) optical haze (420% in visible light wavelengths) 28 derived from highly porous microstructures, (iii) poor water resistance (o28°in water contact angle), 26,29 (iv) difficulty in forming complex, fine shapes and (v) limits in mechanical stretchability. To the best of our knowledge, the potential of CNF to provide stretchable but reliable electronic devices is yet unexplored.…”

Section: Introductionmentioning

confidence: 99%

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Hyun

Kim

et al. 2016

NPG Asia Mater

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Substantial progress in flexible or stretchable electronics over the past decade has extensively impacted various technologies such as wearable devices, displays and automotive electronics for smart cars. An important challenge is the reliability of these deformable devices under thermal stress. Different coefficients of thermal expansion (CTE) between plastic substrates and the device components, which include multiple inorganic layers of metals or ceramics, induce thermal stress in the devices during fabrication processes or long-term operations with repetitions of thermal cyclic loading-unloading, leading to device failure and reliability degradation. Here, we report an unconventional approach to form photo-patternable, transparent cellulose nanofiber (CNF) hybrid films as flexible and stretchable substrates to improve device reliability using simultaneous electrospinning and spraying. The electrospun polymeric backbones and sprayed CNF fillers enable the resulting hybrid structure to be photolithographically patternable as a negative photoresist and thermally and mechanically stable, presenting outstanding optical transparency and low CTE. We also formed stretchable origami substrates using the CNF hybrid that are composed of rigid support fixtures and elastomeric joints, exploiting the photo-patternability. A demonstration of transparent organic light-emitting diodes and touchscreen panels on the hybrid film suggests its potential for use in next-generation electronics.

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“…Figure 2 shows an overall view of the whole experiment, initially started with (a) Graphene oxide solution, (b) ultrasonicated GO solution and with the implementation of (c) 3-electrode system that were connected to a Potentiostat auto-lab with the electrodes accordingly to the color code respectively. which leads to negative reduction peak process, (d) resulting in a reduced GO that is darker in color for coating of Reduced Graphene Oxide on anode side of the (e) ITO substrate through a reduction process on the oxidized GO, (f) obtaining a layer deposition of RGO on ITO, (g) 2 layers depositions coating of graphene and (h) few layers of RGO on the electrode of ITO working electrode side (Yu et al, 2013). In connection made between the PC and metrohm Auto lab potentiostat as a power supply.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Graphene on Conducting Substrate by Electrochemical Deposition Method

Moghazi¹,

Shareef²,

Wong³

et al. 2017

American Journal of Applied Sciences

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Investigation to optimize the synthesis process of graphene on conducting substrate is essential for many applications. In this investigation suitable approach to extract graphene thin film on a conductive ITO substrate is optimized. This optimization is carried out by electrochemical Reduction of Graphene Oxide (RGO) solution utilizing a repetitive cyclic potential against reference electrode. To do this, Silver chloride reference electrode is employed within a three electrode system at a potential range of (0 to -1.5) V. A number of four consecutive cycles is used to obtain a negative reduction peak. Yet more importantly the material's electrochemical properties were studied by Cyclic Voltammetry (CV) operation. From CV, it is clear that, the surface area with electrodeposition from ITO to RGO/ITO and RGO/RGO/ITO rates in a potential window of (2V) for (-1 to 1) V is improved. Moreover, Electrochemical Impedance Spectroscopy (EIS) showed reduced electrode surface internal resistance of the modified electrode that dramatic decreased in comparison from 96.33kΩ of RGO/ITO to 32Ω of RGO/RGO/ITO. In addition, Charge/Discharge Cycle (CDC) is obtained that showed relatively symmetrical charging property along with its corresponding discharge equivalents viewing rapid charging/discharging process that favors redox process for increased mobility and thus conductivity improvement. Moreover the modified electrode was studied for its physical characteristics using Scanning Electron Microscopy (SEM) that showed uniform reduced graphene sheets deposition with particles diameter ranging from 1.65µm to 635nm. Atomic Force Microscopy (AFM) was used in contact mode for a square area of 5µm showing increased surface roughness from ITO of 2.773nm in comparison to Reduced Graphene Oxide/RGO/ITO 34.93nm. Results also proved that deposition of multiple layers of Graphene could strongly improve energy storage applications if implemented by allowing the material to hold greater charge in smaller area. This will lead to enhance the power densities far beyond existing electrochemical capacitors in a cost effective eco-friendly manner.

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Hybrid nanostructured materials for high-performance electrochemical capacitors

Cited by 982 publications

References 116 publications

Supercapacitors specialities - Materials review

Supercapacitors specialities - Materials review

Photo-patternable and transparent films using cellulose nanofibers for stretchable origami electronics

Synthesis of Graphene on Conducting Substrate by Electrochemical Deposition Method

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