New design of electric double layer capacitors with aqueous LiOH electrolyte as alternative to capacitor with KOH solution

Stępniak, Izabela; Ciszewski, Aleksander

doi:10.1016/j.jpowsour.2009.10.094

Cited by 21 publications

(14 citation statements)

References 28 publications

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“…The equivalent series resistance R esr,eis [ ] (summarized in Table II) also can be estimated from the intercept of the extended vertical lines with Z' -axis. Appealingly, the R esr,eis values obtained from the EIS measurement are very close to those from galvanostatic measurement with the lowest value belonging to the glass wool-based capacitor (12 ), evidencing the correspondence of both measurements in reliably evaluating the tested capacitors.…”

Section: Galvanostatic Measurement Voltage Responses Ofsupporting

confidence: 64%

Noncorrosive separator materials for electric double layer capacitor

Noorden

Sugawara

Matsumoto

2014

IEEJ Trans Elec Electron Eng

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The paper evaluates noncorrosive and inexpensive materials, namely polypropylene sheet, fiberglass, and glass wool, as potential separator materials for electric double-layer capacitor (EDLC) application. Using these materials as separators and the same activated carbon electrodes, properties of two-electrode capacitors filled with aqueous sulfuric acid (H 2 SO 4 ) were investigated by cyclic voltammetry (CV) as well as galvanostatic and electrochemical impedance spectroscopy (EIS) measurements. Performance comparison of the tested capacitors with an identical capacitor with conventional cellulose separator was also carried out. As a benchmark, the noncorrosive-separator-based capacitors demonstrate comparable power and energy densities to those of a cellulose separator, with the highest specific capacitance of 131 F/g and lowest equivalent series resistance of 13 for the glass wool separator. Application of such noncorrosive separators may realize the utilization of high-concentration aqueous electrolytes, leading to higher rating EDLCs at lower cost compared to organic-solution-based capacitors.

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Section: Galvanostatic Measurement Voltage Responses Ofsupporting

confidence: 64%

Noncorrosive separator materials for electric double layer capacitor

Noorden

Sugawara

Matsumoto

2014

IEEJ Trans Elec Electron Eng

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“…[49][50][51][52][53][54][55] Comparing the aqueous electrolytes of acidic, basic and neutral nature in presence of carbon-based electrodes, the working potential window seems to be slightly narrower than 1.0 V for the acidic and basic electrolytes and 1.6-2.2 V for the neutral electrolytes. [56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72] The specific capacitance seems to be higher for the acidic than for the basic electrolyte and higher for the basic than for the neutral electrolyte. 57-61, 63-67, 70, 71 A pseudo capacitance in addition to the double layer capacitance has been reported for the three types of aqueous electrolytes.…”

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confidence: 91%

Contribution of Cations and Anions of Aqueous Electrolytes to the Charge Stored at the Electric Electrolyte/Electrode Interface of Carbon-Based Supercapacitors

et al. 2017

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For their use in supercapacitors, aqueous electrolytes of acidic (H 2 SO 4 ), neutral (Na 2 SO 4 , K 2 SO 4 ) and basic (NaOH, KOH) nature are studied, using two microporous binder-free and self-standing carbon cloths as electrodes. The carbon cloths show similar porosities and specific surface areas, but different contents in surface oxygen groups. The working potential window and the specific capacitance associated with the cations and anions are measured. From these parameters, the charges stored by the cations and anions at the electric electrolyte/electrode interface are deduced. The charge stored by the cations is higher than that stored by the anions for the three types of electrolytes. The differences between cations and anions are higher for the acidic and basic electrolyte than for the neutral electrolytes, and also higher for the carbon cloth with the highest content in surface oxygen groups. The charge stored by the cations follows the sequence H 3 O + > Na + or K + from the basic electrolytes > Na + or K + from the neutral electrolytes. The charge stored by the anions follows the sequence SO 4 2-The results here reported provide a better understanding on the electric double layer of carbon-based supercapacitors. Those results are also of interest for asymmetric and hybrid supercapacitors.

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“…Practically, there are three types of electrolytes that have been employed in supercapacitor construction: aqueous, ionic, and organic solutions. Many researchers have focused on formulating supercapacitor electrolytes with good stability and elevated capacity [3,4]. For instance, a previous study conducted by Lewandowski et al . showed that the use of an organic solution (ionic liquid in solvent) results in a higher potential window and comparable power density for higher energy rating applications.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of hydrocarbon‐derived electrolytes for supercapacitors

Noorden

Sugawara

Matsumoto

2012

IEEJ Transactions Elec Engng

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The paper evaluates the essential electrical properties-capacitance and equivalent series resistance (ESR)-of hydrocarbonderived electrolytes for supercapacitors using galvanostatic, constant resistance charge-discharge, cyclic voltammetry, and AC impedance measurements. The electrolytes were systematically prepared from six hydrocarbon-derived compounds, which have different carbon chains and functional groups, with the treatment of concentrated sulfuric acid (H 2 SO 4 ). Both electrical properties seem to be in conformity throughout these measurements, with the longer main carbon chain compounds giving higher capacitance and lower ESR values. Comparison between these electrolytes and the typically used aqueous solutions in supercapacitor research-1M H 2 SO 4 , 5M potassium hydroxide, and 5M sodium hydroxide-showed that the produced electrolytes give the highest capacitance value up to 30 times more than that of typical aqueous solutions. It is believed that with further treatment these hydrocarbon-derived electrolytes can potentially be used in supercapacitors as better performing electrolytes than aqueous solutions and at a relatively low cost compared to organic solutions.

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New design of electric double layer capacitors with aqueous LiOH electrolyte as alternative to capacitor with KOH solution

Cited by 21 publications

References 28 publications

Noncorrosive separator materials for electric double layer capacitor

Noncorrosive separator materials for electric double layer capacitor

Contribution of Cations and Anions of Aqueous Electrolytes to the Charge Stored at the Electric Electrolyte/Electrode Interface of Carbon-Based Supercapacitors

Electrical properties of hydrocarbon‐derived electrolytes for supercapacitors

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