Ultraflexible In‐Plane Micro‐Supercapacitors by Direct Printing of Solution‐Processable Electrochemically Exfoliated Graphene

Liu, Zhaoyang; Wu, Zhong‐Shuai; Yang, Sheng; Dong, Renhao; Feng, Xinliang; Müllen, Kläus

doi:10.1002/adma.201505304

Cited by 385 publications

(312 citation statements)

References 29 publications

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“…The areal capacitance of the L-s-Ti3C2Tx MSC achieved here is superior to most of carbon-based MSCs such as activated carbon (2.3 mF cm -2 ), 9 onion-like carbon (1.7 mF cm -2 ), 10 carbon nanotubes (0.4 mF cm -2 ), 11 reduced graphene oxide (rGO), graphene, porous graphene, and exfoliated graphene (0.1 -5.4 mF cm -2 ), 8,[14][15][16][17]56 graphene/carbon nanotubes composites (2.1 -6.1 mF cm -2 ), 18, 57 cobalt hydroxide/reduced graphene oxide (Co(OH)2/rGO) (6 mF cm -2 ), 25 and comparable to carbon coating of vertically Si nanowire (C@SiNWs) (25.6 mF cm -2 ). 58 The electrochemical capacitive behaviour of the four MSCs was further investigated by electrochemical impedance spectroscopy, as shown in Fig.…”

Section: Resultsmentioning

confidence: 86%

All-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage

Peng

Aküzüm

Kurra

et al. 2016

Energy Environ. Sci.

596

452

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CitationAll-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage 2016 Energy Environ. Sci. On-chip energy storage is a rapidly evolving research topic, opening doors for integration of batteries and supercapacitors at microscales on rigid and flexible platforms. Recently, a new class of two-dimensional (2D) transition metal carbides and nitrides (so-called MXenes) has shown great promise in electrochemical energy storage applications. Here, we report the farbication of all-MXene (Ti3C2Tx) solid-state interdigital microsupercapacitors by employing a solution spray-coating, followed by a photoresist-free direct laser cutting method. Our prototype devices consisted of two layes of Ti3C2Tx with two different flake sizes. The bottom layer was stacked large-size MXene flakes (lateral dimensions of 3-6 μm) serving mainly as current collectors. The top layer was made of small-size MXene flakes (~1 μm) with a large number of defects and edges as the electroactive layer responsible for energy storage. Compared to Ti3C2Tx micro-supercapacitors with platinum current collectors, the all-MXene devices exhibited much lower contact resistance, higher capacitances and better rate-capabilities. The areal and volumetric capacitances of ~27 mF cm -2 and ~357 F cm -3 , respectively, at a scan rate of 20 mV s -1 were achieved. The devices also demonstrated their excellent cyclic stability, with 100 % capacitance retention after 10,000 cycles at a scan rate of 50 mV s -1 . This study opens up a plethora of possible designs for high-performance on-chip devices employing different chemistries, flake sizes and morphologies of MXenes and their heterostructures. Eprint version Broader contextThe continuous development and further miniaturization of portable electronic devices and microelectromechanical systems has led to the increasing demands for micro or nanoscale power sources and energy storage units. Supercapacitors, also called electrochemical capacitors, are energy storage devices with long service life and high power densities that can be fully charged and discharged in seconds. Small-scale supercapacitors, or micro-supercapacitors (MSCs), can be integrated with self-powered microscale devices and provide the required power for a long duration of time without maintenance, serving as ideal stand-alone power sources. The intrinsic properties of electrode materials play a crucially important role in the performance of MSCs. Here, a novel MSC is fabricated by employing a new material, two-dimensional titanium carbide (MXene). The MXene MSCs offer long lifetime and higher areal and volumetric capacities compared to most of the previously reported devices. This work opens up a door for the design of on-chip devices with high energy storage capability by employing a large family (~ 20 members) of 2D MXenes and their heterostructures.

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Section: Resultsmentioning

confidence: 86%

All-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage

Peng

Aküzüm

Kurra

et al. 2016

Energy Environ. Sci.

596

452

View full text Add to dashboard Cite

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“…

The ever-growing demands of portable and wearable electronic devices require continuous development in highly compact and/or flexible energy storage. Therefore, extensive investigation on micro-supercapacitors (μSCs) based on a number of printing, [2,3] lithography, [4][5][6][7][8] and laser (and/or ion) assisted methods [9][10][11][12][13] have been carried out. [1] On the other hand, the microfabrication technology opens up the possibilities for fabrication of microenergy-storage-devices with planar interdigitated structure.

…”

mentioning

confidence: 99%

A Highly Durable, Transferable, and Substrate‐Versatile High‐Performance All‐Polymer Micro‐Supercapacitor with Plug‐and‐Play Function

et al. 2017

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“…However, if the electrode is transferred with an adhesive tape, the electrical resistance of the electrode increases. [8][9][10]21,22] Figure 5b provides the relative electrical resistivity modifications of four cases measured with a bending radius of 2.0 mm, with many bending cycles for each sample. However, the line resistance of the transferred electrode somewhat increased due to the fractured interparticle space being filled with 1D silver nanoparticles.…”

Section: Figurementioning

confidence: 99%

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mentioning

confidence: 99%

Fabrication of a Quasicrystal Electrode at a Low Processing Temperature via Electrohydrodynamic and Transfer Printing for use in Multifunctional Electronics

Park

et al. 2017

Adv Elect Materials

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temperature or with heating at less than 60 °C for 1 h. This is not only one of the important conditions for determining the degree of aggregation of silver, but also for controlling the binding energy of silver or the density of silver that would be higher at the bottom. [18,19] We can also transfer print from the receiver to the adhesive tape, which results in a quasicrystal morphology (R a = nanoscale) with truly excellent flexibility and durability. [8][9][10]21,22] With this approach, we can fabricate flexible tiled circuits, water-proof light emitting diodes (LEDs) without any additional restricting condition, and this transferred electrode would be freestanding, attached to various uneven interface operated LEDs. A merit of this method is that, without adaptive printing on the 3D circuits, we can apply the electrodes on 3D structures by using the projected electrodes.Furthermore, these electrodes are connected to each other to produce long-ranged line pattern arrays, and the soldering disconnection of a wire can be achieved with the nonpatterned residue of the adhesive region.Based on this study, e-NDP can be considered as a new method, which is different from the existing EHD method that needs the condition of a nozzle-to-substrate distance of less than 500 µm for the near-field electrospinning jet. In the existing EHD method, only the Si wafer and the glass substrate through which charged electrons can be transferred to the ground and only their parts in which the solution is aligned after taylorcone formation at the nozzle tip have been used. [11][12][13]15,16,20] We propose a patterning mechanism that offers a closer nozzleto-substrate distance than conventional EHD printing operating at less than 100 µm to easily charge the electron moving nozzle with ground (GNR) in spite of using an insulated PET substrate (Figure 1a,b, inset). This method can be used to fabricate a silver micropatterned electrode that can be printed in ≈4 s (20 mm s −1 is the optimized speed for formation of the electrode) with a 70 mm parallel line pattern. This electrode resolution was controlled by increasing the printing speed ( Figure S1a,b, Supporting Information). Figure 1 shows a schematic to fabricate a silver micropatterned electrode using the e-NDP process. The first step is to pattern a silver trace after printing the e-NDP solution on a PET substrate coated with silver trifluoroacetate (STA) (18 wt%) dissolved in volatile tetrahydrofuran (THF). The second step is to reduce the silver trace pattern using a hydrazine monohydrate solution with ethyl alcohol (30 wt%). This solution is overpatterned on the position of the silver trace at a low temperature of 60 °C for 1 h. As the experimental equipment has a function of automatically performing overpatterning, misalignment could not occur during same-trace-position printing.Pattern formation is a complex technology that has resulted from a collaborative effort by researchers in chemistry and industrial processing. Bath processing has been implemented by a myriad of organiza...

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Ultraflexible In‐Plane Micro‐Supercapacitors by Direct Printing of Solution‐Processable Electrochemically Exfoliated Graphene

Cited by 385 publications

References 29 publications

All-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage

All-MXene (2D titanium carbide) solid-state microsupercapacitors for on-chip energy storage

A Highly Durable, Transferable, and Substrate‐Versatile High‐Performance All‐Polymer Micro‐Supercapacitor with Plug‐and‐Play Function

Fabrication of a Quasicrystal Electrode at a Low Processing Temperature via Electrohydrodynamic and Transfer Printing for use in Multifunctional Electronics

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