Revisited insights into charge storage mechanisms in electrochemical capacitors with Li2SO4-based electrolyte

Fic, Krzysztof; Płatek, Anetta; Piwek, Justyna; Menzel, Jakub; Ślesiński, Adam; Bujewska, Paulina; Galek, Przemysław; Frąckowiak, Elżbieta

doi:10.1016/j.ensm.2019.08.005

Cited by 50 publications

(57 citation statements)

References 153 publications

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“…Although the stability windows of both salts are bounded by H 2 and O 2 evolution reactions, they are much wider than the typical 1.2 V in acid or base electrolytes. The wide voltage window in neutral pH electrolytes has been largely attributed to the greater overpotential from the lacking of protons and hydroxyl ions or local pH change due to hydrogen adsorption at the negative electrode . However, the former may be more dominant in polymer electrolytes due to much slower movement of species within the polymeric structure.…”

Section: Resultsmentioning

confidence: 99%

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Virya

Abella

Grindal

et al. 2019

Batteries & Supercaps

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A highly ionic-conductive and high-performance neutral pH polymer electrolyte comprises of Na 2 SO 4 and polyacrylamide (PAM) was developed for solid electrochemical double-layer capacitors (EDLCs). Na 2 SO 4 was compared with Li 2 SO 4 baseline in liquid electrolyte and exhibited higher ionic conductivity and identical stability window. Na 2 SO 4 À PAM electrolytes were optimized by varying their salt-to-polymer ratio. While all compositions show excellent stability for over 30-day tracking period, an ionic conductivity of ca. 30 mS cm À 1 was attained at 10,000 : 1 molar ratio of Na 2 SO 4 :PAM, among the highest reported for neutral pH polymer electrolytes. Raman spectroscopy verified that the electrolyte maintained well-hydrated ions throughout the 30 days monitoring period. Solid EDLCs were constructed using activated carbon electrodes and Na 2 SO 4 À PAM electrolyte. They exhibited a wide 1.9 V operating window at 50 mV s À 1 CV scan rate, with comparable capacitance to its liquid baseline. The solid EDLCs outperformed many symmetric devices in terms of energy and power densities. They also displayed good rate capability (up to 500 mV s À 1 ) and excellent cycle life (> 8,000 cycles).

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Section: Resultsmentioning

confidence: 99%

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Virya

Abella

Grindal

et al. 2019

Batteries & Supercaps

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“…The shi of the potential towards more negative values is caused by hydrogen sorption overpotential. 26,61,62 In the case of anodic polarization, the shi of the potential is marginal, and it is in the same range of values as in the case of the glassy carbon electrode. The situation is somewhat different in the case of microporous YP-80F carbon, where during cathodic polarization, the potential limitation is shied towards less negative values.…”

Section: Resultsmentioning

confidence: 96%

“…21 In some cases, it is possible to achieve a voltage of up to 1.8 V. [22][23][24] However, the latest research on "water-in-salt" electrolytes shows that even more than 2 V can be achieved for very concentrated electrolytes. 25,26 The third group of electrolytes is ionic liquids; their advantages include the possibility of reaching high voltages, up to 4 V; [27][28][29][30][31] non-ammability; and environmental friendliness. However, their high production cost and poor conductivity limit their application ability in high-power devices.…”

Section: Introductionmentioning

confidence: 99%

Peculiar role of the electrolyte viscosity in the electrochemical capacitor performance

et al. 2021

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“…For aqueous systems, the cathodic and anodic limits of the potential region where the electrolyte does not undergo electrochemical reactions are set by the hydrogen evolution (HER) and the oxygen evolution (OER) reactions, respectively, displaying a stability window of at least 1.23 V. This window can be enlarged by use of "water-insalt"-type electrolytes to achieve stability windows as large as 3 V [24,25]. However, the potential window suitable for determining double layer capacitance is shortened considerably by the presence of any species in the electrolyte that may undergo redox processes at the electrode/electrolyte interface [26], e.g. reduction of dissolved oxygen (ORR), or adsorption/desorption of ions in the solution as shown in Figure 2b.…”

Section: Determination Of Double Layer Capacitancementioning

confidence: 99%

Seven Steps to Reliable Cyclic Voltammetry Measurements for the Determination of Double Layer Capacitance

Morales¹,

Risch

2021

Preprint

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Discovery of electrocatalytic materials for high-performance energy conversion and storage applications relies on the adequate characterization of their intrinsic activity, which is currently hindered by the dearth of a protocol for consistent and precise determination of double layer capacitance (CDL). Herein, we propose a seven-step method that aims to determine CDL reliably by scan rate-dependent cyclic voltammetry. The method considers three aspects that strongly influence the outcome of the analysis: measurement settings, data collection, and data processing. To illustrate the proposed method, two systems were studied: a resistor-capacitor electric circuit and a glassy carbon disk in an electrochemical cell. With these studies it is demonstrated that when any of the mentioned aspects of the procedure are neglected, substantial deviations of the results are observed with misestimations as large as 61% in the case of the investigated electrochemical system. Moreover, we propose allometric regression as a more suitable model than linear regression for the determination of CDL for both the ideal and the non-ideal systems investigated. We stress the importance of assessing the accuracy of not only highly specialized electrochemical methods, but also of those that are well-known and commonly used as it is the case of the voltammetric methods. The methodology proposed herein is not limited to the determination of CDL, but can be effectively applied to any other voltammetry-based analysis that aims to deliver quantitative results.

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Revisited insights into charge storage mechanisms in electrochemical capacitors with Li2SO4-based electrolyte

Cited by 50 publications

References 153 publications

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Peculiar role of the electrolyte viscosity in the electrochemical capacitor performance

Seven Steps to Reliable Cyclic Voltammetry Measurements for the Determination of Double Layer Capacitance

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Revisited insights into charge storage mechanisms in electrochemical capacitors with Li2SO4-based electrolyte

Cited by 50 publications

References 153 publications

Na2SO4‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Na2SO4‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Peculiar role of the electrolyte viscosity in the electrochemical capacitor performance

Seven Steps to Reliable Cyclic Voltammetry Measurements for the Determination of Double Layer Capacitance

Contact Info

Product

Resources

About

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors

Na₂SO₄‐Polyacrylamide Electrolytes and Enabled Solid‐State Electrochemical Capacitors