A Repeated Halving Approach to Fabricate Ultrathin Single‐Walled Carbon Nanotube Films for Transparent Supercapacitors

Niu, Zhiqiang; Zhou, Weiya; Chen, Jun; Feng, Guoxing; Li, Hong; Hu, Yong‐Sheng; Ma, Wu; Dong, Haibo; Li, Jinzhu; Xie, Sishen

doi:10.1002/smll.201201587

Cited by 94 publications

(73 citation statements)

References 46 publications

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“…Moreover, high T simultaneously results in reduced CA, hence a reduction in the energy which can be stored by a device with a given footprint. 27,32 Quantifying these trade-offs using the described figures of merit will greatly assist with the development of high performance transparent SCs.…”

Section: mentioning

confidence: 99%

“…Whilst examples of the former are presently scarce, 16 significant efforts are underway to develop transparent/flexible SCs. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] The electrode materials under investigation for this purpose are numerous, including carbon nanotubes, 27,[32][33] graphene, 21,29,34 transition metal oxides 17, 19-20, 23, 25 and conducting polymers. 17,22,30 In some transparent SC reports, the capacitive charge storage materials have been supported by an underlying transparent indium-tin oxide (ITO) layer to provide efficient current collection.…”

Section: Introductionmentioning

confidence: 99%

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Avoiding Resistance Limitations in High-Performance Transparent Supercapacitor Electrodes Based on Large-Area, High-Conductivity PEDOT:PSS Films

Higgins

Coleman

2015

ACS Appl. Mater. Interfaces

145

135

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This work describes the potential of thin, spray-deposited, large-area poly(3,4-ethylenedioxythiophene)/poly(styrene-4-sulfonate) (PEDOT:PSS) conducting polymer films for use as transparent supercapacitor electrodes. To facilitate this, we provide a detailed explanation of the factors limiting the performance of such electrodes. These films have a very low optical conductivity of σop = 24 S/cm (at 550 nm), crucial for this application, and a reasonable volumetric capacitance of C V = 41 F/cm3. Secondary doping with formic acid gives these films a DC conductivity of σDC = 936 S/cm, allowing them to perform both as a transparent conductor/current collector and transparent supercapacitor electrode. Small-area films (A ∼ 1 cm2) display measured areal capacitance as high as 1 mF/cm2, even for reasonably transparent electrodes (T ∼ 80%). However, in real devices, the absolute capacitance will be maximized by increasing the device area. As such, here, we measure the electrode performance as a function of its length and width. We find that the measured areal capacitance falls dramatically with scan rate and sample length but is independent of width. We show that this is because the measured areal capacitance is limited by the electrical resistance of the electrode. We have derived an equation for the measured areal capacitance as a function of scan rate and electrode lateral dimensions that fits the data extremely well up to scan rates of ∼1000 mV/s (corresponding to charge/discharge times > 0.6 s). These results are self-consistent with independent analysis of the electrical and impedance properties of the electrodes. These results can be used to find limiting combinations of electrode length and scan rate, beyond which electrode performance falls dramatically. We use these insights to build large-area (∼100 cm2) supercapacitors using electrodes that are 95% transparent, providing a capacitance of ∼12 mF (at 50 mV/s), significantly higher than that of any previously reported transparent supercapacitor.

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Section: mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Avoiding Resistance Limitations in High-Performance Transparent Supercapacitor Electrodes Based on Large-Area, High-Conductivity PEDOT:PSS Films

Higgins

Coleman

2015

ACS Appl. Mater. Interfaces

145

135

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“…Recently, interest in making transparent and flexible EDLCs has risen due to several applications in displays, touch sensors, photovoltaics, OLED, etc., which hold promise to change the way we use electronics. Carbon nanotubes and other carbon materials can be used to fabricate electrodes for these novel transparent and flexible EDLC (Table 1) [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, to achieve high optical transparency one should use ultrathin films, which limits the conductivity of the electrodes and sets a requirement for a very high mass specific capacitance to achieve adequate performance.…”

Section: Introductionmentioning

confidence: 99%

Transparent and flexible high-performance supercapacitors based on single-walled carbon nanotube films

Kanninen

Luong

et al. 2016

Nanotechnology

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Transparent and flexible energy storage devices have gathered great interest due to their suitability for display, sensor and photovoltaic applications. In this paper, we report the application of aerosol synthesized and dry deposited single-walled carbon nanotube (SWCNT) thin films as electrodes for electrochemical double-layer capacitor (EDLC). SWCNT films exhibit extremely large specific capacitance (178 F g -1 or 552 µF cm -2 ), high optical transparency (92%) and stability for 10000 charge/discharge cycles. A transparent and flexible EDLC prototype is constructed with a polyethylene casing and a gel electrolyte.

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“…[174] In addition, ultrathin SWNT films were fabricated as transparent electrodes, which can be directly used for supercapacitors. [175] On the strength of such merits, the first stretchable transparent supercapacitor was demonstrated from the vertically aligned CNT forest. [38] The electrode was formed by drawing a transparent CNT sheet from the highly aligned multiwalled CNT forest onto a PDMS substrate as illustrated in Figure 10a.…”

Section: Supercapacitorsmentioning

confidence: 99%

Deformable and Transparent Ionic and Electronic Conductors for Soft Energy Devices

Park

Parida

Lee

2017

Advanced Energy Materials

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The recent boom in deformable or stretchable electronics, flexible transparent displays/screens, and their integration into the human body has facilitated the development of multifunctional energy devices that are stretchable, transparent, wearable, and/or biocompatible while meeting the energy or power requirements. The development of soft energy systems begins with the preparation of relevant conductors and the design of innovative device configurations. In this study, recent advances and trends in stretchable and transparent electronic and ionic conductors are reviewed coupled with the growing efforts to use them for soft energy storage and conversion systems. Stretchable transparent ionic conductors present possibilities for use as current collectors and electrolytes in soft electronic/energy devices, providing novel insight into biofriendly systems for an effective human–machine interaction. Moreover, representative examples that demonstrate soft energy devices based on stretchable transparent ionic/electronic conductors are discussed in detail. Furthermore, the challenges and perspectives of developing novel stretchable transparent conductors and device configurations with tailored features are also considered.

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A Repeated Halving Approach to Fabricate Ultrathin Single‐Walled Carbon Nanotube Films for Transparent Supercapacitors

Abstract: Ultrathin SWCNT transparent and conductive films on flexible and transparent substrates are prepared via repeatedly halving the directly grown SWCNT films and flexible and transparent supercapacitors with excellent performance were fabricated.

Cited by 94 publications

References 46 publications

Avoiding Resistance Limitations in High-Performance Transparent Supercapacitor Electrodes Based on Large-Area, High-Conductivity PEDOT:PSS Films

Avoiding Resistance Limitations in High-Performance Transparent Supercapacitor Electrodes Based on Large-Area, High-Conductivity PEDOT:PSS Films

Transparent and flexible high-performance supercapacitors based on single-walled carbon nanotube films

Deformable and Transparent Ionic and Electronic Conductors for Soft Energy Devices

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