Electroanalytical characterization of electrochemical capacitor systems

McCarthy, Julien; Mavroudis, Helena; Donne, Scott W.

doi:10.1016/j.electacta.2019.135010

Cited by 7 publications

(3 citation statements)

References 44 publications

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“…The origin of these side redox reactions in carbon-based electrodes in the organic medium is believed to have a number of possible sources, including the consumption of an electroactive species at the surface and bulk of electrode, the presence of water, molecular oxygen and impurities in the organic salt. These impurities, which can cause ongoing redox reactions, have been previously observed using a sensing electrode [45,48]. In a short period of equilibration time (~ 1 min), the contribution of the residual current is insignificant; however, at longer times when eventually other processes decayed to zero, it becomes more significant due to its non-zero constant current.…”

Section: Deconvolution Of the Specs Currentmentioning

confidence: 77%

Application of step potential electrochemical spectroscopy in pouch cell prototype capacitors

Roberts

2021

Electrochimica Acta

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Section: Deconvolution Of the Specs Currentmentioning

confidence: 77%

Application of step potential electrochemical spectroscopy in pouch cell prototype capacitors

Roberts

2021

Electrochimica Acta

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“…We have also used techniques to deconvolute voltametric data into contributions from capacitive, mass transport and residual processes to provide insight into charge storage mechanisms. 28 Examples of full cell cyclic voltammograms are shown in Fig. 1a, in this case for a GCE electrode spacing of 10 mm in 0.5 M K 2 SO 4 , at various sweep rates.…”

Section: Resultsmentioning

confidence: 99%

Electrode Spacing Effects on the Capacitance of Glassy Carbon Electrodes in Aqueous Electrolytes

Wilson,

Callahan,

Cameron

et al. 2024

J. Electrochem. Soc.

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Matched glassy carbon electrodes in aqueous K2SO4 electrolytes were used to examine the effects of opposing electrode spacing on capacitive performance. Planar non-porous glassy carbon electrodes were used to avoid complications with porosity and roughness. Electrode spacing effects were examined in terms of device and individual electrode performance, using cyclic voltammetry, coupled with its deconvolution into residual, diffusional, and capacitive processes. Decreasing the spacing between electrodes led to a decrease in capacitive contributions, and a relative increase in diffusional and residual contributions, implying that individual electrodes were influencing the behaviour of each other. This is also consistent with the use of more dilute electrolytes. Electrode behaviour was modelled using the Poisson-Boltzmann equation, together with its integrated outputs of electric field and potential difference. For electrodes with the same amount of charge and a similar diffuse layer thickness, the electric field and potential drop was diminished because of their charge interaction. Conversely, it is shown that for a similar potential drop across the electrodes, the variable controlled in a cyclic voltammetry experiment, more charge accumulation is needed at the electrode-electrolyte interface to compensate for the counter charge generate from the opposing electrode.

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“…These properties can be manipulated by changing the nanostructure and material fabrication methods to achieve high energy and power densities. There are three types of supercapacitors, namely, electrochemical double-layer capacitors (EDLC), pseudocapacitors, and hybrid capacitors [5][6][7][8][9]. Among them, pseudocapacitor has attained much progress due to its high-power density, good stability, long life cycle and low-cost.…”

Section: Introductionmentioning

confidence: 99%

High performing Zn-embedded Ni9S8 nanosphere electrodes for Pseudo-supercapacitors

Dhilipkumar¹,

Jeganathan

Joseph³

et al. 2021

J Mater Sci: Mater Electron

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Highly electroactive Zn-embedded Ni 9 S 8 nanosphere and its ZnS/Ni x S 6 -based nanocomposites were prepared by a simple hydrothermal route. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transformed infrared spectra (FTIR), high-resolution scanning electron microscope (HR-SEM), transmission electron microscope (TEM), energy-dispersive X-ray spectral (EDX) techniques. The XRD analysis revealed the formation of orthorhombic phase of Zn-embedded Ni 9 S 8 nanosphere for hydrothermally treated sample. The supercapacitance behavior of crystalline Zn-embedded Ni 9 S 8 nanosphere and ZnS/Ni x S 6 nanocomposite modified electrodes were investigated using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and galvanostatic charge-discharge (GCD) techniques. Zn-embedded Ni 9 S 8 nanosphere prepared by hydrothermal route achieved highest specific capacitance value of 145 F/g in 1 A/g compared to the calcined sample modified electrodes. The maximum capacity retention of 100, 96 and 90% at 2000 cycles @1 A/g were observed for the pristine Zn-Ni 9 S 8 and calcined Zn-Ni 9 S 8 at 200 and 300 °C, respectively.

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Electroanalytical characterization of electrochemical capacitor systems

Cited by 7 publications

References 44 publications

Application of step potential electrochemical spectroscopy in pouch cell prototype capacitors

Application of step potential electrochemical spectroscopy in pouch cell prototype capacitors

Electrode Spacing Effects on the Capacitance of Glassy Carbon Electrodes in Aqueous Electrolytes

High performing Zn-embedded Ni9S8 nanosphere electrodes for Pseudo-supercapacitors

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