Bioinspired Effective Prevention of Restacking in Multilayered Graphene Films: Towards the Next Generation of High‐Performance Supercapacitors

Yang, Xiaowei; Zhu, Junwu; Qiu, Ling; Li, Dan

doi:10.1002/adma.201100261

Cited by 992 publications

(881 citation statements)

References 49 publications

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“…To demonstrate the multifunctionality of the RGO film in a variety of large-scale applications, we have explored the RGO films for supercapacitors. Graphene materials have recently been used in supercapacitor 37,38 devices to replace conventional carbon electrodes and have shown very good performance. Figure 5a schematically illustrates the process flow to use our RGO film for the flexible supercapacitor electrodes.…”

Section: Resultsmentioning

confidence: 99%

“…S12, specific surface area of 648 m 2 g À 1 ) than that processed directly from RGO solution (specific surface area of 330 m 2 g À 1 ). In addition, to further retain a high surface area, we have directly used the freshly reduced wet RGO films as the capacitor electrodes without drying the film, which can prevent capillary drying effect and the re-stack of the graphene sheets 38 .…”

Section: Resultsmentioning

confidence: 99%

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A low-temperature method to produce highly reduced graphene oxide

et al. 2013

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Chemical reduction of graphene oxide can be used to produce large quantities of reduced graphene oxide for potential application in electronics, optoelectronics, composite materials and energy-storage devices. Here we report a highly efficient one-pot reduction of graphene oxide using a sodium-ammonia solution as the reducing agent. The solvated electrons in sodium-ammonia solution can effectively facilitate the de-oxygenation of graphene oxide and the restoration of p-conjugation to produce reduced graphene oxide samples with an oxygen content of 5.6 wt%. Electrical characterization of single reduced graphene oxide flakes demonstrates a high hole mobility of 123 cm 2 Vs À 1 . In addition, we show that the pre-formed graphene oxide thin film can be directly reduced to form reduced graphene oxide film with a combined low sheet resistance (B350 O per square with B80% transmittance). Our study demonstrates a new, low-temperature solution processing approach to high-quality graphene materials with lowest sheet resistance and highest carrier mobility.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A low-temperature method to produce highly reduced graphene oxide

et al. 2013

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“…[1] Those are ideal for fast energy storage and delivery, e.g., for smart power grids and hybrid electric vehicles. [2] However, their energy density (3-5 Wh kg −1 ) is relatively low, compared with the traditional batteries (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35) Wh kg −1 ). In order to boost their performance, efforts have been devoted to increase the specific capacitance of the electrode material, both in terms of the power and the energy densities.…”

Section: Introductionmentioning

confidence: 99%

“…Further advancement in their structural characteristics has been achieved by solutionprocessing of GO, including hydrothermal/solvothermal curing, filtration, chemical reduction, and activation. [27][28][29][30] Direct solid-state exfoliation by microwave and thermal shock has also been applied. [31][32][33][34][35] Typical gravimetric capacitance (≈250 F g −1 ) of such structures is still less than the theoretical value of 550 F g −1 due to the strong overlapping/aggregation of graphene layers via π-π aromatic interactions, thus leading to reduced accessibility of the interlayer spacing.…”

Section: Introductionmentioning

confidence: 99%

Design of 3D Graphene‐Oxide Spheres and Their Derived Hierarchical Porous Structures for High Performance Supercapacitors

Gadipelli

Yang

et al. 2017

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Graphene‐oxide (GO) based porous structures are highly desirable for supercapacitors, as the charge storage and transfer can be enhanced by advancement in the synthesis. An effective route is presented of, first, synthesis of three‐dimensional (3D) assembly of GO sheets in a spherical architecture (GOS) by flash‐freezing of GO dispersion, and then development of hierarchical porous graphene (HPG) networks by facile thermal‐shock reduction of GOS. This leads to a superior gravimetric specific capacitance of ≈306 F g−1 at 1.0 A g−1, with a capacitance retention of 93% after 10 000 cycles. The values represent a significant capacitance enhancement by 30–50% compared with the GO powder equivalent, and are among the highest reported for GO‐based structures from different chemical reduction routes. Furthermore, a solid‐state flexible supercapacitor is fabricated by constructing the HPG with polymer gel electrolyte, exhibiting an excellent areal specific capacitance of ≈220 mF cm−2 at 1.0 mA cm−2 with exceptional cyclic stability. The work reveals a facile but efficient synthesis approach of GO‐based materials to enhance the capacitive energy storage.

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“…One of the most promising applications of graphene films is their use as electrode material for supercapacitors due to their large specific surface area, high conductivity and excellent electrochemical stability. 2,23,24 Recently, graphene-based macroscopic films have received increasing attention for use in electrochemical energy storage applications. [25][26][27][28][29] Despite these examples of significant progress, most of the studies of graphene-based films for use in supercapacitors to date involved the fabrication of free-standing graphene films or the preparation of electrodes with the binder first and then the transfer of the electrode film onto current collector (conductive substrate, for example, platinum, gold or copper foil); such processes introduce high contact resistance between the electrode and the current collector, which result in significant loss of storage and transmission capacity.…”

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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Bioinspired Effective Prevention of Restacking in Multilayered Graphene Films: Towards the Next Generation of High‐Performance Supercapacitors

Cited by 992 publications

References 49 publications

A low-temperature method to produce highly reduced graphene oxide

A low-temperature method to produce highly reduced graphene oxide

Design of 3D Graphene‐Oxide Spheres and Their Derived Hierarchical Porous Structures for High Performance Supercapacitors

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

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