Investigation of supercapacitor cyclic degradation through impedance spectroscopy and Randles circuit model

Poonam,; Vyas, Mayank; Jangid, Dinesh Kumar; Rohan, Rupesh; Pareek, Kapil

doi:10.1002/est2.355

Cited by 16 publications

(6 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The smaller semicircular diameter at higher frequencies is attributed to the electrode‘s lower charge transfer resistance ( R ct ~38.03 Ω) in the ether‐based electrolyte solution. The straight line at lower frequencies in the Nyquist plot is related to ion transport and ion interactions, which also supports the capacitive behavior of the MoS 2 electrode [71] . The intercept on the real axis at higher frequencies is related to the equivalent series resistance ( ESR ) of the developed LIC.…”

Section: Supercapacitor Performancesupporting

confidence: 62%

Molybdenum Sulfide Nanoflowers as Electrodes for Efficient and Scalable Lithium‐Ion Capacitors

Mir,

Hoseini,

Hansen

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

Hybrid supercapacitors (HSCs) bridge the unique advantages of batteries and capacitors and are considered promising energy storage devices for hybrid vehicles and other electronic gadgets. Lithium‐ion capacitors (LICs) have attained particular interest due to their higher energy and power density than traditional supercapacitor devices. The limited voltage window and the deterioration of anode materials upsurged the demand for efficient and stable electrode materials. Two‐dimensional (2D) molybdenum sulfide (MoS2) is a promising candidate for developing efficient and durable LICs due to its wide lithiation potential and unique layer structure, enhancing charge storage efficiency. Modifying the extrinsic features, such as the dimensions and shape at the nanoscale, serves as a potential path to overcome the sluggish kinetics observed in the LICs. Herein, the MoS2 nanoflowers have been synthesized through a hydrothermal route. The developed LIC exhibited a specific capacitance of 202.4 F g‑1 at 0.25 A g‑1 and capacitance retention of > 90% over 5,000 cycles. Using an ether electrolyte improved the voltage window (2.0 V) and enhanced the stability performance. The ex‐situ material characterization after the stability test reveals that the storage mechanism in MoS2‐LICs is not diffusion‐controlled. Instead, fast surface redox reactions, especially intercalation/deintercalation, are more prominent for charge storage.

show abstract

Section: Supercapacitor Performancesupporting

confidence: 62%

Molybdenum Sulfide Nanoflowers as Electrodes for Efficient and Scalable Lithium‐Ion Capacitors

Mir,

Hoseini,

Hansen

et al. 2024

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…In addition, since the density of the composite MnO@WAC is higher than the one for WAC, 0.35 and 0.25 g cm −3 respectively, the volumetric capacitance of the nanocomposite is higher than the carbon material in the whole range of current density (Figure 5c). More benefits of the incorporation of 1 % of MnO can be evidenced by electrochemical impedance spectroscopy (EIS) which provides the resistance and capacitance of a supercapacitor from the frequency response [28] …”

Section: Resultsmentioning

confidence: 99%

“…More benefits of the incorporation of 1 % of MnO can be evidenced by electrochemical impedance spectroscopy (EIS) which provides the resistance and capacitance of a supercapacitor from the frequency response. [28] The Nyquist plots obtained from potentiostatic electrochemical impedance spectroscopy (PEIS) measurements are depicted in Figure 5d, showcasing the typical curves associated with porous carbon electrodes. Since the construction of the two supercapacitors only differs in the nature of the electrode materials, the electrical series resistance (ESR) calculated from the intersection on the real axis of the Nyquist plot in the highfrequency region primarily reflects the bulk electrode conductivity.…”

Section: Electrochemical Characterizationmentioning

confidence: 98%

Enhancing Electrochemical Properties of Walnut Shell Activated Carbon with Embedded MnO Clusters for Supercapacitor Applications

Esteban,

Chamocho,

Carretero González

et al. 2024

Batteries & Supercaps

View full text Add to dashboard Cite

Activated carbon (AC) materials from renewable sources are widely used in electrochemical applications due to their well‐known high surface area. However, their application as electrode material in double‐layer electrochemical devices may be limited due to their relatively low electrical conductivity and lightweight. To overcome these limitations, the incorporation of pseudocapacitance metal oxide nanoparticles is an optimum approach. These nanoparticles can provide a second energy storage mechanism to the composite, mitigating the loss of surface area associated with their incorporation. As a result, the composite material is endowed with increased conductivity and higher density, making it more suitable for practical implementation in real devices. In this study, we have incorporated a fine dispersion of 1% of MnO clusters into a highly porous activated carbon synthesized from walnut shells (WAC). The high‐resolution electron microscopy studies, combined with their related analytical techniques, allow us to determine the presence of the cluster within the matrix carbon precisely. The resulting MnO@WAC composite demonstrated significantly improved capacitive behavior compared with the WAC material, with increased volumetric capacitance and higher charge retention at higher current densities. The composite's electrochemical performance suggests its potential as a promising electrode material for supercapacitors, addressing drawbacks associated with traditional AC materials.

show abstract

“…Impedance models (actually equivalent circuits) for EDLC-type supercapacitors have been critically compared, and a multi-pore model was recommended [ 15 ]. Using a simple Randles circuit [ 16 ], impedance measurement data from an EDLC device were fitted [ 17 ]. Unfortunately, no option to verify the quality of the fits was provided in the report; the list of fitted parameters does not even show units.…”

Section: Introductionmentioning

confidence: 99%

Ag(e)ing and Degradation of Supercapacitors: Causes, Mechanisms, Models and Countermeasures

Chen

Holze

2023

Molecules

View full text Add to dashboard Cite

The most prominent and highly visible advantage attributed to supercapacitors of any type and application, beyond their most notable feature of high current capability, is their high stability in terms of lifetime, number of possible charge/discharge cycles or other stability-related properties. Unfortunately, actual devices show more or less pronounced deterioration of performance parameters during time and use. Causes for this in the material and component levels, as well as on the device level, have only been addressed and discussed infrequently in published reports. The present review attempts a complete coverage on these levels; it adds in modelling approaches and provides suggestions for slowing down ag(e)ing and degradation.

show abstract

Investigation of supercapacitor cyclic degradation through impedance spectroscopy and Randles circuit model

Cited by 16 publications

References 32 publications

Molybdenum Sulfide Nanoflowers as Electrodes for Efficient and Scalable Lithium‐Ion Capacitors

Molybdenum Sulfide Nanoflowers as Electrodes for Efficient and Scalable Lithium‐Ion Capacitors

Enhancing Electrochemical Properties of Walnut Shell Activated Carbon with Embedded MnO Clusters for Supercapacitor Applications

Ag(e)ing and Degradation of Supercapacitors: Causes, Mechanisms, Models and Countermeasures

Contact Info

Product

Resources

About