Flexible, aqueous-electrolyte supercapacitors based on water-processable dioxythiophene polymer/carbon nanotube textile electrodes

Lang, Augustus W.; Ponder, James F.; Österholm, Anna M.; Kennard, Nicole Josiane; Bulloch, Rayford H.; Reynolds, John R.

doi:10.1039/c7ta07932j

Cited by 42 publications

(42 citation statements)

References 54 publications

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“…However, the Cs values at the scan rates of 10 and 25 mV•s -1 are slightly lower than that of 50 mV•s -1 and deviates from the usual scan rate dependency trend of the Cs (Figure 7a). This behavior has previously been observed for thin conducting polymer or metal/metal oxide based electrodes in aqueous electrolytes [48,49] and deserves to be further investigated.…”

Section: Thin Film Popd Electrodes-half Cell Performance (3-electrodesupporting

confidence: 67%

Correlation between the interfacial ion dynamics and charge storage properties of poly(ortho-phenylenediamine) electrodes exhibiting high cycling stability

Halim

Demir‐Cakan

Perrot

et al. 2019

Journal of Power Sources

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An integrated electrogravimetric study based on electrochemical quartz crystal microbalance (EQCM) unravels the interfacial ion transfer phenomena of the poly(orthophenylenediamine) (PoPD) thin film electrodes. Through a methodology coupling QCM with electrochemical impedance spectroscopy (ac-electrogravimetry), our work indicates that charge compensation process of PoPD in aqueous electrolytes (in acidified NaCl) occurs with the participation of multiple species, each playing a role at different temporal scales. The PoPD films are tested in a 2 electrode Swagelok cell in which Zn is used as both reference and counter electrodes and exhibit excellent stability over 8000 cycles with a relatively high specific capacitance of about 110 F•g-1 at 30 C (0.63 mA•cm-2) current density. The high rate capability and the excellent cycling stability of the PoPD electrodes are correlated to the electrolyte composition and the significant role of H + to the charge compensation process is unravelled, which is made possible with coupled electrogravimetric methods of our study. By determining the interfacial flux dynamics and as well as the relative proportions of species transferred at the electrode/electrolyte interface, our results contribute to the understanding of the charge-discharge process of PoPD polymer, yet underexplored but emerging as a pseudo-capacitive electrode material.

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Section: Thin Film Popd Electrodes-half Cell Performance (3-electrodesupporting

confidence: 67%

Correlation between the interfacial ion dynamics and charge storage properties of poly(ortho-phenylenediamine) electrodes exhibiting high cycling stability

Halim

Demir‐Cakan

Perrot

et al. 2019

Journal of Power Sources

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“…These materials have exceptional electrochromic properties with high contrast in the visible region and, upon reversible electrochemical doping, exhibit color‐neutral oxidized states with rapid switching times . Additionally, the broad electroactive response of the high EDOT content polymers in the ProDOT x –EDOT y (P x E y ) series has led to them being effective as capacitive materials for charge storage applications . In our previous work, we have shown that increasing the EDOT content in the repeat unit of these copolymers lowers the onset of oxidation, increases the capacitance, and lowers the optical gap ( E g ) of the resulting material.…”

Section: Introductionmentioning

confidence: 99%

Conductive, Solution‐Processed Dioxythiophene Copolymers for Thermoelectric and Transparent Electrode Applications

Ponder

Menon

Dasari

et al. 2019

Advanced Energy Materials

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Conjugated polymers with high electrical conductivities are attractive for applications in capacitors, biosensors, organic thermoelectrics, and transparent electrodes. Here, a series of solution processable dioxythiophene copolymers based on 3,4‐propylenedioxythiophene (ProDOT) and 3,4‐ethylenedioxythiophene (EDOT) is investigated as thermoelectric and transparent electrode materials. Through structural manipulation of the polymer repeat unit, the conductivity of the polymers upon oxidative solution doping is tuned from 1 × 10−3 to 3 S cm−1, with a polymer consisting of a solubilizing alkylated ProDOT unit and an electron‐rich biEDOT unit (referred to as PE2) showing the highest electrical conductivity. Optimization of the film casting method and screening of dopants result in AgPF6‐doped PE2 achieving a high electrical conductivity of over 250 S cm−1 and a thermoelectric power factor of 7 μW m−1 K−2. Oxidized spray cast films of PE2 are also assessed as a transparent electrode material for use with another electrochromic polymer. This bilayer shows reversible electrochemical switching from a colored charge‐neutral state to a highly transmissive color‐neutral, oxidized state. These results demonstrate that dioxythiophene‐based copolymers are a promising class of materials, with ProDOT–biEDOT serving as a soluble analog to the well‐studied PEDOT as a p‐type thermoelectric and electrode material.

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“…The effect of various aqueous electrolytes has been extensively studied with various carbon powder composite electrodes [17][18][19]. A few studies have been performed with fibrous electrodes [20] or electrospun carbon-containing electrodes [21] in aqueous electrolytes but, to our knowledge, no studies have directly electrospun fibrous electrodes of CDCs. The most fundamental studies have been performed with H 2 SO 4 -H 2 O and KOH-H 2 O electrolytes, but these electrolytes are corrosive and have a working voltage range up to 1.0 V [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

The Performance of Fibrous CDC Electrodes in Aqueous and Non-Aqueous Electrolytes

Malmberg

Arulepp

Laanemets

et al. 2021

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The aim of this study was to investigate the electrochemical behaviour of aqueous electrolytes on thin-layer (20 µm) nanoporous carbide-derived carbon (CDC) composite fibrous directly electrospun electrodes without further carbonisation. There have been previously investigated fibrous electrodes, which are produced by applying different post-treatment processes, however this makes the production of fibrous electrodes more expensive, complex and time consuming. Furthermore, in the present study high specific capacitance was achieved with directly electrospun nanoporous CDC-based fibrous electrodes in different neutral aqueous electrolytes. The benefit of fibrous electrodes is the advanced mechanical properties compared to the existing commercial electrode technologies based on pressure-rolled or slurry-cast powder mix electrodes. Such improved mechanical properties are preferred in more demanding applications, such as in the space industry. Electrospinning technology also allows for larger electrode production capacities without increased production costs. In addition to the influence of aqueous electrolyte chemical composition, the salt concentration effects and cycle stability with respect to organic electrolytes are investigated. Cyclic voltammetry (CV) measurements on electrospun electrodes showed the highest capacitance for asymmetrical cells with an aqueous 1 M NaNO3-H2O electrolyte. High CV capacitance was correlated with constant current charge–discharge (CC) data, for which a specific capacitance of 191 F g−1 for the positively charged electrode and 311 F g−1 for the negatively charged electrode was achieved. The investigation of electrolyte salt concentration on fibrous electrodes revealed the typical capacitance dependence on ionic conductivity with a peak capacitance at medium concentration levels. The cycle-life measurements of selected two-electrode test cells with aqueous and non-aqueous electrolytes revealed good stability of the electrospun electrodes.

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Flexible, aqueous-electrolyte supercapacitors based on water-processable dioxythiophene polymer/carbon nanotube textile electrodes

Abstract: Water soluble-solvent resistant approach for aqueous supercapacitors.

Cited by 42 publications

References 54 publications

Correlation between the interfacial ion dynamics and charge storage properties of poly(ortho-phenylenediamine) electrodes exhibiting high cycling stability

Correlation between the interfacial ion dynamics and charge storage properties of poly(ortho-phenylenediamine) electrodes exhibiting high cycling stability

Conductive, Solution‐Processed Dioxythiophene Copolymers for Thermoelectric and Transparent Electrode Applications

The Performance of Fibrous CDC Electrodes in Aqueous and Non-Aqueous Electrolytes

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