What is the choice for supercapacitors: graphene or graphene oxide?

Xu, Bin; Yue, Shufang; Sui, Zhuyin; Zhang, Xuetong; Hou, Shifeng; Cao, Gaoping; Yang, Yusheng

doi:10.1039/c1ee01198g

Cited by 674 publications

(427 citation statements)

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“…Previous studies on KOH interaction with graphene were limited to its role as an electrolyte [30][31][32] as well as an agent for chemical modification of graphene [33] for supercapacitive applications, or as a processing step to remove graphene from SiO 2 [34,35]. However a comprehensive study on the interaction of KOH processing on the structural and electrical properties of micronsized single layer flakes is missing.…”

mentioning

confidence: 99%

Stability of suspended monolayer graphene membranes in alkaline environment

Miranda

Lorke

2017

Materials Research Letters

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mentioning

confidence: 99%

Stability of suspended monolayer graphene membranes in alkaline environment

Miranda

Lorke

2017

Materials Research Letters

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“…The deviations of the CV curves at specific potential regions are related to the rapid Faradaic reactions, which may be correlated to the presence of additional oxygen-containing functional groups, especially epoxy and alkoxy, at the surface of the carbon. 27,30 PRGO films exhibit the largest current density in the CV curves, implying a larger capacitance than those of the GO and CCG films. Figure 3b shows the CV curves of the PRGO films at different scan rates.…”

Section: Fabrication Of Prgo Films Y Shao Et Almentioning

confidence: 99%

“…Our PRGO films are directly coated onto conductive substrate, which advantageously minimizes the contact resistance, thus enabling the double-layer charges to be conveniently transferred to the current collector to cause the partial reduction of GO films and to further enhance the capacitance performance. 30 A symmetrical two-electrode system was used to characterize the electrochemical characteristics of the as-fabricated PRGO films in comparison with those of the GO films and the CCG films. Figure 3a shows the cyclic voltammograms (CVs) of the PRGO films, the GO films and the CCG films in 1 mol l À1 Na 2 SO 4 aqueous solutions for applied potentials between 0 V and 0.8 V at a scan rate of 50 mV s À1 .…”

Section: Fabrication Of Prgo Films Y Shao Et Almentioning

confidence: 99%

Fabrication of large-area and high-crystallinity photoreduced graphene oxide films via reconstructed two-dimensional multilayer structures

et al. 2014

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Graphene, the last representative sp 2 carbon material to be isolated, acts as an ideal material platform for constructing flexible electronic devices. Exploring a new method to fabricate high-quality graphene films with high throughput is essential for achieving greater performance with flexible electronic devices. Here, we report a facile coating and subsequent illumination method for mass-fabricating highly crystalline photoreduced graphene oxide (PRGO) films directly onto conductive substrates. The direct fabrication of PRGO films onto Cu foils with partial oxygenated groups, an intensive stacked highly crystalline structure, and reduced graphene oxide regions enable significant performance enhancements when used as supercapacitor electrodes compared with other graphene-only devices, exhibiting high specific capacitances of 275 F g À1 at a scan rate of 10 mV s À1 and 167 F g À1 at 1 V g À1 with excellent rate capability. The as-established all-solid-state flexible supercapacitors exhibit superior flexibility and robust mechanical stability, resulting in a capacitance delay of only 2% after performing 100 bending cycles. The demonstrated PRGO films provide a promising material platform to realize a broad range of applications related to flexible electronics devices. INTRODUCTIONFlexible electronic devices have garnered considerable attention because of the benefits enabled by large-area, lightweight, flexible electrode films, which have the potential to enable unique advances in future mobile applications, such as wearable displays, roll-up solar cells, electronic skin and flexible energy storage. 1,2 Graphene films containing a few layers or multiple layers of two-dimensional graphene sheets are prominent contenders as attractive components for use in flexible electronic devices due to their high conductivity, chemical stability and mechanical flexibility. 3,4 For the practical applications of graphene in these fields, scalable production of macroscopic-scale graphene films is required rather than the current micrometer-sized graphene sheets. To date, the synthesis of large-scale flexible graphene films has mainly been demonstrated by two approaches. One approach is the 'bottom-up' synthesis strategy, by which high-quality graphene can be prepared using chemical vapor deposition to grow graphene at high temperature, followed by a transfer procedure to place graphene films onto flexible substrates; 5 however, this method is not sufficiently cost-and time-effective to be commercially viable for mass production and requires a difficult post-functionalization step to produce the appropriate graphene films. Another approach is the 'top-down' method, that is, solution

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“…Climate change and the ever decreasing storage of non-regenerative fossil fuels have forced human beings to pay much attention to sustainable and regenerative energies and their conversion and storage [1]. As an energy-storage device, supercapacitor with the advantages of high power density, short charging time, low cost and long life cycle has attracted considerable attention in recent years [2].There are three type of materials to fabricate the electrode of supercapacitors: carbon materials [3], transition metal oxides [4], and conducting polymer [5,6].…”

Section: Introductionmentioning

confidence: 99%