Graphene-hollow-cubes with network-faces assembled a 3D micro-structured transparent and free-standing film for high performance supercapacitors

Li, Na; Huang, Xuankai; Zhang, Haiyan; Shi, Zhicong; Wang, Chengxin

doi:10.1039/c7ta03935b

Cited by 23 publications

(15 citation statements)

References 33 publications

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“…Beyond the stability and high-cost issues, MXene-based transparent SCs have other performance limitations. Compared to graphene/metal hydroxidebased transparent SC, which demonstrated a C/A up to 18 mF cm -2 (T = 40%) [230,236], the Ti3C2Tx transparent SC showcases a higher T (73%) but a much lower C/A (1.2 mF cm -2 ). Methods for further capacitance enhancement are needed.…”

Section: Challenges and Opportunities Of Mxene-based Transparent Supercapacitorsmentioning

confidence: 90%

“…Moreover, using a similar method, Li et al prepared freestanding graphene hollow-cube films with improved C/A (5.48 mF cm -2 ), volumetric E (657.2 µW h cm -3 ) and P (954.3 mW cm -3 ) at the cost of transmittance (T = 44% for the single electrode) (Fig. 16h) [230]. A single device possessed a good robust nature.…”

Section: Graphene-based Transparent Supercapacitorsmentioning

confidence: 99%

“…In spite of these progresses, the fabrication procedures of the aforementioned wrinkled graphene films/freestanding papers are rather complicated which either involve high temperature processing (~ 1000 °C for CVD growth of graphene) or multiple steps to obtain high-quality graphene films [46,47,227,228,230]. For the potential application of graphene-based transparent SCs, sustainable, feasible and facile processes are of essential importance.…”

Section: Graphene-based Transparent Supercapacitorsmentioning

confidence: 99%

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Graphene and MXene-based transparent conductive electrodes and supercapacitors

Zhang

Nicolosi

2019

Energy Storage Materials

349

237

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The great popularity of portable, smart electronics has intensively stimulated the development of energy storage devices and other cutting-edge products, such as displays and touch panels. Interactive devices such as smart phone, tablets, and other touchable devices require mechanical robust transparent conductive electrodes (TCEs). Developing transparent supercapacitor as the power source is of significance to the next generation transparent electronics. Recently, graphene and MXene, the two representatives in the large two-dimensional family, have shown excellent electronic conductivity and attracted great research attention in the energy storage field. Importantly, high-performance TCEs are the prerequisite of building transparent supercapacitors. This review provides a comprehensive analysis of graphene and MXene-based flexible TCEs covering detailed thin film fabrication methods, evaluation metrics, performance limitations as well as approaches to beat these limitations. We especially focus on the fundamentals in the TCEs, such as figure of merit, percolations as well as conductivity behaviours. Graphene and MXene-based transparent supercapacitors are analysed, with a particular focus on transparent, freestanding graphene papers. Finally, the challenges and prospects of MXene for TCEs and transparent supercapacitors, in conjunction with a critical analysis of MXene shortcomings, are discussed.

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Section: Challenges and Opportunities Of Mxene-based Transparent Supercapacitorsmentioning

confidence: 90%

Section: Graphene-based Transparent Supercapacitorsmentioning

confidence: 99%

Section: Graphene-based Transparent Supercapacitorsmentioning

confidence: 99%

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Graphene and MXene-based transparent conductive electrodes and supercapacitors

Zhang

Nicolosi

2019

Energy Storage Materials

349

237

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“…Particularly, graphene and its derivatives have demonstrated versatile feasibility for use in supercapacitor electrodes. [18][19][20][21][22][23][24][25][26] Graphene possesses outstanding physical and chemical properties, including high electrical conductivity and specific surface area, and therefore has been widely investigated as an electrode material for energy storage. 27 One approach that has been previously used to assemble graphene into a practical architecture is the production of long thin fibres or ribbons with controlled structures.…”

Section: Introductionmentioning

confidence: 99%

A single step strategy to fabricate graphene fibres via electrochemical exfoliation for micro-supercapacitor applications

Marsden

et al. 2019

Electrochimica Acta

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A green and low-cost method is presented to fabricate graphene fibre electrodes by electrochemical exfoliation of thin strips of graphite foil. When assembled into microsupercapacitors, the graphene fibres achieved an excellent electrochemical capacitance (~ 247.6 mF•cm-2 at ~2 mA•cm-2) and low equivalent series resistance (~ 2.4 Ω), a significant improvement over the typically used graphene oxide based fibres. This excellent capacitive performance indicates these graphene-based energy storage devices could be ideal for microelectronics applications. Additionally, an all-solid-state flexible micro-supercapacitor was fabricated using a gel electrolyte (H3PO4/PVA) and exhibited a high areal capacitance of 70.6 mF•cm-2 and a superior cycling stability of ~ 96% capacitance retention after 2400 cycles, suggesting possible applications for flexible energy storage. The easily scalable and facile single step strategy presented here outperforms the conventionally used graphene oxide based methods, which typically require harmful chemicals and involve a more complex synthesis procedure.

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“…The scalpel technique has enabled a transformation from a single transparent electrode film into an array of coplanar devices without compromising intrinsic optoelectronic characteristics. This study is a starting point which can prompt other classes of transparent electrodes to be carved in the form of coplanar devices and correlated using the FoM c of transparent electrodes with that of transparent devices . Therefore, this FoM c should not be compared to other values obtained for single electrodes (not full devices) in other studies.…”

mentioning

confidence: 99%

Automated Scalpel Patterning of Solution Processed Thin Films for Fabrication of Transparent MXene Microsupercapacitors

Sallés

Quain

Kurra

et al. 2018

Small

107

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A simple and generic strategy is proposed to pattern thin films deposited by a solution processable route. A soft approach based on an automated scalpel technique is developed to engrave thin films in a single step for sculpting functional planar devices. MXenes—the emerging family of 2D transition metal carbides and nitrides—combine metallic conductivity and hydrophilicity, enabling solution processing of transparent conducting electrodes (TCEs) under ambient conditions. Scalable dip coating is employed to process titanium carbide, Ti3C2, MXene thin films with excellent optoelectronic properties, achieving electrical Figure of merit up to 14. Automated scalpel engraving is adopted to fabricate transparent and semi‐transparent MXene microsupercapacitors in a single step, hitherto not reported. Combining TCE and pseudocapacitive characteristics, MXene devices show excellent capacitive storage capabilities at high rates, without the aid of external metal current collectors. This technique allows for maskless patterning of solution processed thin films without losing intrinsic physicochemical properties and can be extended to fabricate heterostructured hybrid devices out of solution processable materials.

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Graphene-hollow-cubes with network-faces assembled a 3D micro-structured transparent and free-standing film for high performance supercapacitors

Abstract: A kind of 3D micro-structured transparent and free-standing film assembled by graphene-hollow-cubes with network-faces was developed using a micro-structured NaCl template.

Cited by 23 publications

References 33 publications

Graphene and MXene-based transparent conductive electrodes and supercapacitors

Graphene and MXene-based transparent conductive electrodes and supercapacitors

A single step strategy to fabricate graphene fibres via electrochemical exfoliation for micro-supercapacitor applications

Automated Scalpel Patterning of Solution Processed Thin Films for Fabrication of Transparent MXene Microsupercapacitors

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