Flexible asymmetric supercapacitors based on ultrathin two-dimensional nanosheets with outstanding electrochemical performance and aesthetic property

Shi, Shan; Xu, Chengjun; Yang, Cheng; Chen, Yanyi; Liu, Juanjuan; Kang, Feiyu

doi:10.1038/srep02598

Cited by 145 publications

(71 citation statements)

References 54 publications

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“…[ 448 ] Other grid-like transparent energy conversion devices have been subsequently proposed. [ 449 ] Li et al have designed semitransparent transparent devices by means of interdigit electrodes. [ 442 ] Using this approach, the authors have fabricated dye-sensitized solar cells and supercapacitors, the later having a carbon-carbon symmetrical confi guration (Figure 15 C).…”

Section: Optically Active Schemes/confi Gurationsmentioning

confidence: 99%

Design Considerations for Unconventional Electrochemical Energy Storage Architectures

Vlad

Singh

Galande

et al. 2015

Advanced Energy Materials

278

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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Section: Optically Active Schemes/confi Gurationsmentioning

confidence: 99%

Design Considerations for Unconventional Electrochemical Energy Storage Architectures

Vlad

Singh

Galande

et al. 2015

Advanced Energy Materials

278

204

View full text Add to dashboard Cite

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“…[264] Copyright 2013, Macmillan Publishers Ltd.; image in row 5: reproduced with permission. [266] Copyright 2013, Macmillan Publisher Ltd.; image in row 7: reproduced with permission. [266] Copyright 2013, Macmillan Publisher Ltd.; image in row 7: reproduced with permission.…”

Section: Manganese Oxide Nanosheetsmentioning

confidence: 99%

Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

et al. 2017

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The exponential increase in research focused on two-dimensional (2D) metal oxides has offered an unprecedented opportunity for their use in energy conversion and storage devices, especially for promising next-generation rechargeable batteries, such as lithium-ion batteries (LIBs) and sodium-ion batteries (NIBs), as well as some post-lithium batteries, including lithium-sulfur batteries, lithium-air batteries, etc. The introduction of well-designed 2D metal oxide nanomaterials into next-generation rechargeable batteries has significantly enhanced the performance of these energy-storage devices by providing higher chemically active interfaces, shortened ion-diffusion lengths, and improved in-plane carrier-/charge-transport kinetics, which have greatly promoted the development of nanotechnology and the practical application of rechargeable batteries. Here, the recent progress in the application of 2D metal oxide nanomaterials in a series of rechargeable LIBs, NIBs, and other post lithium-ion batteries is reviewed relatively comprehensively. Current opportunities and future challenges for the application of 2D nanomaterials in energy-storage devices to achieve high energy density, high power density, stable cyclability, etc. are summarized and outlined. It is believed that the integration of 2D metal oxide nanomaterials in these clean energy devices offers great opportunities to address challenges driven by increasing global energy demands.

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“…The preparation of the neutral gel electrolyte was based on work reported by Shi et al [25] Briefly, 2 m Ca(NO 3 ) 2 aqueous solution, SiO 2 powder, and carboxymethylcellulose were mixed in weight ratios of 90:10:1, and the mixture was then continuously ground in an agate mortar for 2.5 h, leading to a Ca(NO 3 ) 2 /SiO 2 neutral gel that was used as the solid electrolyte in the graphene-manganese oxide hybrid film supercapacitors.…”

Section: Preparation Of Polymer Gel Electrolytesmentioning

confidence: 99%

A Planar Graphene‐Based Film Supercapacitor Formed by Liquid–Air Interfacial Assembly

Chen

Xiang

et al. 2017

Adv Materials Inter

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Consequently, flexible supercapacitors, as advanced energy storage and conversion devices, are gradually attracting intense interest, and considerable effort has been devoted to the fabrication and engineering of highly flexible active electrode materials. [5,6] Graphene, a 2D carbon material discovered in 2004, [7] can be easily manipulated into macroscopic flexible films due to its ultralarge aspect ratio, [8] and graphene-based films have been reported to be promising electrode materials for flexible supercapacitors thanks to their high bendability, excellent electrical conductivity and easy modification. [9][10][11][12][13] The assembly of graphene-based films is crucial for fabricating graphene-based flexible film supercapacitors. Vacuum filtration and chemical vapor deposition (CVD) are common ways to prepare graphene-based films, with micrometer and nanometer thicknesses, respectively. The films are generally deposited on rigid substrates (such as a porous alumina filter, a silicon wafer, quartz, glass, and metal foils). [14,15] In order to use the as-produced graphene-based films as flexible active electrodes, a complicated transfer procedure from the original rigid substrate to a flexible substrate (such as polyethylene terephthalate (PET) and polyimide (PI)) is often required, which involves sacrifice or removal of the original substrate and hence is rather costly and time-consuming. [15] An interesting liquid-air interfacial phenomenon of graphene oxide (GO) films was reported a few years ago. [16] In the assembly, homogeneous GO aqueous solution is used as the parent solution, GO nanosheets concentrate at the interface constructed by the GO solution and air due to its amphiphilic nature, and kinetic energy provided by heat treatment promotes the concentration process of GO nanosheets, leading to formation of a GO film at the interface. This film could be easily retrieved by a flexible PET substrate, leading to a PET-supported GO film after drying in ambient conditions, and this PET-supported GO film is an ideal precursor for a flexible graphene film electrode. GO is chemically active and thermally unstable and can be reduced to graphene by chemical or heat treatment. In this work, such a PET-supported GO film was reduced into electrically conductive graphene film with highly integrity and flexibility by using hydriodic acid as the reducing reagent. A flexible supercapacitor could then be constructed on it. The size and A liquid-air interfacial assembly is used to produce a flexible substratesupported graphene film, which does not need the tedious substrate-transfer procedure that is generally required for many other film-making methods. The graphene film is used as the active working electrode in its planar configuration and an acidic polymer gel is used as the electrolyte, which leads to a flexible planar graphene film supercapacitor with a large areal specific capacitance of 773 µF cm −2 and superior retention performance. In order to demonstrate the versatile application of interfacial assembly in ...

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Flexible asymmetric supercapacitors based on ultrathin two-dimensional nanosheets with outstanding electrochemical performance and aesthetic property

Cited by 145 publications

References 54 publications

Design Considerations for Unconventional Electrochemical Energy Storage Architectures

Design Considerations for Unconventional Electrochemical Energy Storage Architectures

Two‐Dimensional Metal Oxide Nanomaterials for Next‐Generation Rechargeable Batteries

A Planar Graphene‐Based Film Supercapacitor Formed by Liquid–Air Interfacial Assembly

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