Evaluation of defects and current kinetics for aging analysis of PEDOT:PSS based supercapacitors

Rehman, Hafeez Ur; Shuja, Ahmed; Ali, Muhammad Umair; Murtaza, Imran; Meng, Hong

doi:10.1016/j.est.2020.101243

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…However, the slow capacitance drop may be ascribed to the PEDOT:PSS aging effect, recently investigated and attributed to electrodes inhomogeneous electrical and morphological properties. [ 67 ] The energy and power averaged on the 10K cycles and normalized on device length and area (considering as active area only the electrodes surface) are 5.5 μWh cm −1 , 177 μWh cm −2 , 290 μW cm −1 , and 950 μW cm −2 (other detailed values are given in Table S3, Supporting Information). Compared to similar works (Table S4, Supporting Information), the surface and volumetric energy and power are much higher meaning that our PEDOT:PSS@KNF fibers are highly performing electrodes for electrochemical capacitors and the proposed synthesis method is a valid alternative to other literature approaches.…”

Section: Resultsmentioning

confidence: 99%

PEDOTS:PSS@KNF Wire‐Shaped Electrodes for Textile Symmetrical Capacitor

Gibertini

Magagnin

2022

Adv Materials Inter

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represent a more reliable, safer, and longer lifecycle alternative. A number of fibers made of graphene, carbon nanotubes, conductive polymer and, more recently, MXenes were successfully obtained by wet-spinning technique and investigated as 1D electrodes for wearable supercapacitors. [17][18][19][20][21][22][23][24][25][26][27][28][29] However, these materials usually involve complex procedure for their synthesis, harmful dispersant solvent or post-treatment steps to produce fibers with sufficient mechanical resistance and electrochemical performances. Aramid nanofibers (ANFs) have been recently proposed as a new nanoscale building block to design new composite materials. [30] Contrary to standard route based on monomer polymerization, ANFs can be easily and quickly obtained through top-down approach by dissolution of aramid polymeric chains and then re-assembled in macroscopic fibers or film by solution processing. [30,31] Aramid polymer is well-known for its mechanical strength but it's not electrically conductive and must be loaded with conductive fillers to achieve electronic transport. Up to date, ANFs have been mainly investigated as filler for polymers reinforcement, [32,33] matrix for multi-purpose membranes, [34][35][36][37] thermal shields, [38,39] and even additive for separators and solid-state electrolyte for Li-ion batteries. [40,41] However, despite the good wet-spinnability of KNF dispersions, only poor attention was paid to the employment of ANFs for making FSCs. In previous work, Cao et al. fabricated fibers with core-shell structure by co wet-spinning a core carbon nanotube dispersion and a sheath ANFs dispersion. [42] The symmetrical FSCs obtained by infiltration with H 3 PO 4 /PVA gel electrolyte showed a remarkable linear capacity up to 0.75 mF cm −1 . Wang et al. loaded graphene nanoplatelets (GNPs) to a ANF dispersion to obtain a ANFs/GNPs composite wire-shaped electrodes by coagulation in a water/acetic acid solution. [43] However, their results showed that GNPs interfered with the ANFs coagulation by hydrogen bonds restoration between terephthalamide units resulting in a consistent decrease of the tensile strength at high GNPs incorporation in the ANFs matrix.In this work, PEDOT:PSS@KNFs composite fibers were produced by a simple two-step process involving the nanofibrillation of Kevlar to Kevlar nanofibers (KNF), wet-spinning of the KNF fiber and the following soaking into a PEDOT:PSS aqueous dispersion. In this way, electrically conductive fibers were obtained due to the conductive PEDOT:PSS chains percolation keeping almost unaltered the mechanical resistance of the KNF matrix. The PEDOT:PSS@KNF fibers were flexible, knittable and sewable, and by coupling adjacent two fibers, a symmetric FSC couldThe emerging wearable electronics and e-textiles have motivated tremendous interests in textile energy storage microdevices. Among them, fiber-shaped capacitors (FSCs) offer unique properties because of their 1D configuration and reliable energy storage. In recent years, many works focused o...

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Section: Resultsmentioning

confidence: 99%

PEDOTS:PSS@KNF Wire‐Shaped Electrodes for Textile Symmetrical Capacitor

Gibertini

Magagnin

2022

Adv Materials Inter

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“…The collected angle difference between the charging voltage and the current is presented as phase degree in Table 2 . The negative angle degree is related to the leading current from voltage by 90 degrees [ 49 ]. Another parameter that was calculated from the bode plot was the average electrons lifetime (τ) by peak frequency (f p ) as shown in Equation (2) [ 50 ].…”

Section: Resultsmentioning

confidence: 99%

Nano Carbon Doped Polyacrylamide Gel Electrolytes for High Performance Supercapacitors

et al. 2021

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Novel polyacrylamide gel electrolytes (PGEs) doped with nano carbons with enhanced electrochemical, thermal, and mechanical properties are presented. Carboxylated carbon nanotubes (fCNTs), graphene oxide sheets (GO), and the hybrid of fCNT/GO were embedded in the PGEs to serve as supercapacitor (SC) electrolytes. Thermal stability of the unmodified PGE increased with the addition of the nano carbons which led to lower capacitance degradation and longer cycling life of the SCs. The fCNT/GO-PGE showed the best thermal stability, which was 50% higher than original PGE. Viscoelastic properties of PGEs were also improved with the incorporation of GO and fCNT/GO. Oxygen-containing functional groups in GO and fCNT/GO hydrogen bonded with the polymer chains and improved the elasticity of PGEs. The fCNT-PGE demonstrated a slightly lower viscous strain uninform distribution of CNTs in the polymer matrix and the defects formed within. Furthermore, ion diffusion between GO layers was enhanced in fCNT/GO-PGE because fCNT decreased the aggregation of GO sheets and improved the ion channels, increasing the gel ionic conductivity from 41 to 132 mS cm−1. Finally, MnO2-based supercapacitors using PGE, fCNT-PGE, GO-PGE, and fCNT/GO-PGE electrolytes were fabricated with the electrode-specific capacitance measured to be 39.5, 65.5, 77.6, and 83.3 F·g−1, respectively. This research demonstrates the effectiveness of nano carbons as dopants in polymer gel electrolytes for property enhancements.

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“…During this time span, whenever the voltage drops, we call it as ''Dead Zone'' because in this time interval, no voltage can be sensed at the load terminals. After the ''Dead Zone'' interval, the extent of charge is going to decrease at the internal self-discharge resistance [44]; thus, the voltage magnitude at the anode/cathode terminals falls. The stored charge in form of voltage sustains 0.64 V to 0.2 V at * 10 min duration which is called ''Operation Zone'' of the supercapacitor.…”

Section: Resultsmentioning

confidence: 99%

Investigation of charge and current dynamics in PVA–KOH gel electrolyte-based supercapacitor

Rehman

Shuja

Ali

et al. 2021

J Mater Sci: Mater Electron

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Poly-vinyl alcohol (PVA)-based electrolytes can play a vital role in the development of supercapacitors by providing a desirable charge separator layer with an added advantage of stretchable nature. These properties enable them as a global contender in wearable electronics and charge storage applications. In this study, the PVA-based electrolyte has been synthesized with potassium hydrooxide (KOH) as ionic migration agent, which may enhance the electronic double-layers capacitance (EDLC) phenomena. In order to mechanically strengthen the graphene-based activated carbon, larger pore fabric is utilized for its encapsulation. Post-fabrication analysis of the supercapacitor using the standard imaging/microscopy techniques (scanning electron microscopy, electron-dispersive electroscope, and atomic force microscopy) are carried out as initial diagnostic test. For detailed electrical, optical, and charge-based evaluation, electrochemical impedance spectroscopy (EIS), Nyquist plot analysis, currentvoltage (I-V) measurements, charged deep-level transient spectroscopy (Q-DLTS), and photoluminescence spectroscopy (PLs) are performed. The fabricated supercapacitor took * 30 min to completely discharge itself at ''full load operation.'' The band diagram, at carrier transport levels, has also revealed the presence of two possible trap centers which may be responsible for the degradation and/or overall stability of the supercapacitor.

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Evaluation of defects and current kinetics for aging analysis of PEDOT:PSS based supercapacitors

Cited by 15 publications

References 32 publications

PEDOTS:PSS@KNF Wire‐Shaped Electrodes for Textile Symmetrical Capacitor

PEDOTS:PSS@KNF Wire‐Shaped Electrodes for Textile Symmetrical Capacitor

Nano Carbon Doped Polyacrylamide Gel Electrolytes for High Performance Supercapacitors

Investigation of charge and current dynamics in PVA–KOH gel electrolyte-based supercapacitor

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