Synthesis of layered birnessite-type manganese oxide thin films on plastic substrates by chemical bath deposition for flexible transparent supercapacitors

Hu, Yu; Zhu, Hongwei; Wang, Jun; Chen, Zhenxing

doi:10.1016/j.jallcom.2011.08.080

Cited by 70 publications

(35 citation statements)

References 47 publications

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“…The calculated ratio between Na and Mn (Na:Mn) was found to be 0.32:1, which also agrees with the layered birnessite structure [32]. TGA result shows a total weight loss of 18 % until about 500°C that corresponds, first, to the evaporation of adsorbed water molecules (14 %, until 300°C) and then to the loss of structural water (another 4 %) (Fig.…”

Section: Structural Characterizationsupporting

confidence: 83%

Synthesis of nanosized MnO2 prepared by the polyol method and its application in high power supercapacitors

Goikolea

Daffos

Taberna

et al. 2013

Mater Renew Sustain Energy

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Over the last years, the different polymorphs of MnO 2 have been intensely studied as alternative compounds to amorphous hydrous RuO 2 as supercapacitor electrode materials. In the present work, nanosized birnessite-type MnO 2 platelets were synthesized via the polyol method followed by a subsequent ligand removal with NaOH. The resulting compound is easily dispersible in polar solvents, thus allowing the preparation of stable dispersions (2-3 days) that could be used in thin electrode preparation. The capacitance of the synthesized product was 130 F g -1 in a potential window of 0.8 V at a scan rate of 2 mV s -1 . The synthesized material was also studied using a cavity microelectrode to evaluate the electrochemical performance of the nanostructured oxide at high scan rates. Cyclic voltammetry measurements were successfully carried out both in the previous potential window between 0.1 and 0.9 V (vs. SHE) and in a larger potential window between -0.6 and 1.1 V (vs. SHE) from 0.1 and up to 1,000 mV s -1 . Therefore, herein prepared material could be potentially used for high power applications, although further work should be carried out to upscale such compound without compromising the performance.

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Section: Structural Characterizationsupporting

confidence: 83%

Synthesis of nanosized MnO2 prepared by the polyol method and its application in high power supercapacitors

Goikolea

Daffos

Taberna

et al. 2013

Mater Renew Sustain Energy

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“…Provided V C is indeed constant for all film thicknesses, these data should be described [18][19][20][21][22][23][24][25] We highlight that other than this work and that of King et al, 27 to our knowledge no other data has been presented for electrodes with T> 90%, the region of interest for transparent devices. SI Figure S4 contains a reproduction of Figure 2D indicating the authors of the literature data, which weren't included for clarity.…”

Section: Electrochemical Properties Of Small Area Electrodesmentioning

confidence: 82%

“…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%

“…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. [19][20][21][22][23][24][25] However, due to its brittle nature, the growing cost of indium and need for both high-vacuum and high-temperature processing, 36 it is unlikely this material will be 4 compatible with future printed electronics. Rather, we believe it is more likely that future transparent/flexible SCs will contain ITO-free electrodes deposited directly on plastic substrates.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

140

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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“…In addition to power and energy densities, supercapacitors in portable electronics require optical transparency and mechanical flexibility. 8,9 Supercapacitors store energy directly through the electrostatic charge accumulated at the electrode/electrolyte interfaces. 10 Carbon materials, including carbon nanotubes, 6 activated carbon, 5 carbon aerogels, 11 carbon nanofibers, 12 and templated porous carbon 13 have been extensively studied as supercapacitor electrodes because of their large specific surface area (SSA), high conductivity, lightweight, controllable pore size distribution, and chemical stability.…”

mentioning

confidence: 99%

Transparent, flexible, and solid-state supercapacitors based on graphene electrodes

et al. 2013

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In this study, graphene-based supercapacitors with optical transparency and mechanical flexibility have been achieved using a combination of poly(vinyl alcohol)/phosphoric acid gel electrolyte and graphene electrodes. An optical transmittance of ∼67% in a wavelength range of 500-800 nm and a 92.4% remnant capacitance under a bending angle of 80° have been achieved for the supercapacitors. The decrease in capacitance under bending is ascribed to the buckling of the graphene electrode in compression. The supercapacitors with high optical transparency, electrochemical stability, and mechanical flexibility hold promises for transparent and flexible electronics

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Synthesis of layered birnessite-type manganese oxide thin films on plastic substrates by chemical bath deposition for flexible transparent supercapacitors

Cited by 70 publications

References 47 publications

Synthesis of nanosized MnO2 prepared by the polyol method and its application in high power supercapacitors

Synthesis of nanosized MnO2 prepared by the polyol method and its application in high power supercapacitors

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

Transparent, flexible, and solid-state supercapacitors based on graphene electrodes

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