Modular theory for DC-biased electrochemical impedance response of supercapacitor

Mishra, Gaurav Kumar; Kant, Rama

doi:10.1016/j.jpowsour.2020.228467

Cited by 37 publications

(29 citation statements)

References 76 publications

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“…The magnitude of impedance and phase angle of impedance shows slight changes in the frequency range. According to Singh et al., 45 ,46 these changes are mainly depending on the heterogeneity of these electrodes 47 . The diameter of the semicircle increased in the inhibited test solution in comparison with that have obtained in the uninhibited.…”

Section: Resultsmentioning

confidence: 86%

“…According to Singh et al, 45,46 these changes are mainly depending on the heterogeneity of these electrodes. 47 The diameter of the semicircle increased in the inhibited test solution in comparison with that have obtained in the uninhibited. Moreover, the diameter of the semicircle increased with increasing of the inhibitor concentration.…”

Section: Eis Measurementsmentioning

confidence: 77%

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Hexadecyl trimethyl ammonium bromide‐modified 4‐mercaptopyridinde mixture for enhancement of corrosion resistance: Experimental and molecular dynamics simulation study

Han

Wang

et al. 2021

Int J of Chemical Kinetics

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The synergistic effect between 4-mercaptopyridine (4MP) and hexadecyl trimethyl ammonium bromide (C 16 TAB) was studied using electrochemical method combined with weight loss measurements. The spontaneous adsorption of the inhibitor follows Langmuir isotherm. They work as mix-type inhibitor with predominant control of the cathodic process. The inhibition efficiency of the inhibitor mixture (C 16 TAB-MP) is higher than those of the individual component and increases with increasing of the inhibitor concentration. 4MP molecule adsorb on metal chemically through N and S atom, whereas C 16 TAB molecule through physisorption of N atom, after they coadsorbed on the iron surface, both of them adsorb through chemisorption. The distance between N-Fe and S-Fe in C 16 TAB-MP is shorter than that in the 4MP or C 16 TAB containing system. C 16 TAB and 4MP show good synergistic effect.

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Section: Resultsmentioning

confidence: 86%

Section: Eis Measurementsmentioning

confidence: 77%

Hexadecyl trimethyl ammonium bromide‐modified 4‐mercaptopyridinde mixture for enhancement of corrosion resistance: Experimental and molecular dynamics simulation study

Han

Wang

et al. 2021

Int J of Chemical Kinetics

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“…So, to understand the difference on the voltammograms in Figure 7, we must therefore imagine what is happening in the inner Helmholtz layer at the AC interface in positive and negative electrodes. [71,72] In EC/PC/3DMC, the unsolvated FTFSI À anions have a dimension (~0.6 nm) close to that of solvated cations with a double solvation sphere (~0.65 nm). Their access to porosity therefore balances the charges adsorbed on the carbon surface of the two electrodes and would not cause polarization.…”

Section: Effect Of Aftfsi Salt Nature (A = LI Na K) On Sc Performancementioning

confidence: 99%

Role of FTFSI Anion Asymmetry on Physical Properties of AFTFSI (A=Li, Na and K) Based Electrolytes and Consequences on Supercapacitor Application

2021

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This study compares the physicochemical properties of six electrolytes comprising of three salts: LiFTFSI, NaFTFSI and KFTFSI in two solvent mixtures, the binary (3EC/7EMC) and the ternary (EC/PC/3DMC). The transport properties (conductivity, viscosity) as a function of temperature and concentration were modeled using the extended Jones-Dole-Kaminsky equation, the Arrhenius model, and the Eyring theory of transition state for activated complexes. Results are discussed in terms of ionicity, solvation shell, and cross-interactions between electrolyte components. The application of the six formulated electro-lytes in symmetrical activated carbon (AC)//AC supercapacitors (SCs) was characterized by cyclic voltammetry (CV), galvanostatic cycling with potential limitation (GCPL), electrochemical impedance spectroscopy (EIS) and accelerated aging. Results revealed that the geometrical flexibility of the FTFSI anion allows it to access and diffuse easily in AC whereas its counter ions (Li + , Na + or K + ) can remain trapped in porosity. However, this drawback was partially resolved by mixing LiFTFSI and KFTFSI salts in the electrolyte.

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“…7 [52][53][54][55]; for instance, the extrapolated resistance in the limit of infinite f corresponds to the total series resistance of the electrode and electrolyte combination, Rin, whilst the electric double-layer capacitance, Cdl, and the effective resistance of charge-transfer processes, Rct, are commonly estimable from the diameter and peak position of the semi-circular relationship between imaginary and real impedance at intermediate frequencies. As one approaches the direct-current mode of operation, the EIS behaviour is predominantly dictated by pseudocapacitance mechanisms; this contribution can often be described by a finite-space Warburg impedance, ZW, given by [53][54][55][56][57][58][59][60][61]…”

Section: Electrochemical Impedance Measurementsmentioning

confidence: 99%

Electrochemical Characterisations to Elucidate the Pseudocapacitance Mechanisms of a CdS/WOx Nanocomposite Photoanode in Acidic Aqueous Electrolytes

Jones

Dunnill²

2021

Preprint

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The electrochemical properties of a cadmium sulphide/tungsten(VI) sub-oxide (CdS/WOx) nanocomposite have been explored using aqueous solutions of acetic acid (pH 2.2) and acidified sodium acetate (pH 5.0), for the purpose of evaluating the origin of pseudocapacitance within the material. Through transient photocurrent response, galvanostatic charge/discharge and electrochemical impedance measurements, it was established that cation-intercalation phenomena were principally responsible for charge-accumulation in the composite and that the incorporation of ionic species into interstitial surface sites was more energetically favourable for protons than for sodium ions. The composite displayed promising capacitive performance in the tested electrolytes, exhibiting Coulombic efficiencies of up to 88% under galvanostatic cycling at 1.0 mA cm-2 alongside a peak differential capacitance value of 560 mF cm-2 during the discharge phase. From electrochemical impedance spectroscopy data it was further determined that whilst illumination by white light acted to decrease the series resistance of the photoanode, all other resistive and capacitive components of the impedance characteristics were affected negligibly by the irradiation. In combination, the investigations detailed herein provide an instructive resource for the development of CdS/WOx composites and the optimisation of electrolytes to improve the performance and chemical stability of such materials. Furthermore, the study serves as a potential foundation from which to advance the concept of integrating the conversion and storage of solar energy into a single dual-functional electrode, in turn facilitating a new generation of photo-supercapacitor devices.

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Modular theory for DC-biased electrochemical impedance response of supercapacitor

Cited by 37 publications

References 76 publications

Hexadecyl trimethyl ammonium bromide‐modified 4‐mercaptopyridinde mixture for enhancement of corrosion resistance: Experimental and molecular dynamics simulation study

Hexadecyl trimethyl ammonium bromide‐modified 4‐mercaptopyridinde mixture for enhancement of corrosion resistance: Experimental and molecular dynamics simulation study

Role of FTFSI Anion Asymmetry on Physical Properties of AFTFSI (A=Li, Na and K) Based Electrolytes and Consequences on Supercapacitor Application

Electrochemical Characterisations to Elucidate the Pseudocapacitance Mechanisms of a CdS/WOx Nanocomposite Photoanode in Acidic Aqueous Electrolytes

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