Interfacial aspects induced by saturated aqueous electrolytes in electrochemical capacitor applications

Galek, Przemysław; Frąckowiak, Elżbieta; Fic, Krzysztof

doi:10.1016/j.electacta.2019.135572

Cited by 24 publications

(14 citation statements)

References 64 publications

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“…It is worth noting that devices fabricated with commercial ACs have a specific capacitance of about 100–150 F/g (depending on the electrolyte in the system) [ 30 ]. Lupo et al report values of C S for single electrode ranged between 32 and 52 F/g for similar devices fabricated with chitosan as a binder and by using the same aqueous electrolyte 1 M NaCl [ 17 ].…”

Section: Resultsmentioning

confidence: 99%

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

et al. 2021

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Environmentally friendly energy storage devices have been fabricated by using functional materials obtained from completely renewable resources. Gelatin, chitosan, casein, guar gum and carboxymethyl cellulose have been investigated as sustainable and low-cost binders within the electrode active material of water-processable symmetric carbon-based supercapacitors. Such binders are selected from natural-derived materials and industrial by-products to obtain economic and environmental benefits. The electrochemical properties of the devices based on the different binders are compared by using cyclic voltammetry, galvanostatic charge/discharge curves and impedance spectroscopy. The fabricated supercapacitors exhibit series resistance lower than a few ohms and values of the specific capacitance ranged between 30 F/g and 80 F/g. The most performant device can deliver ca. 3.6 Wh/kg of energy at a high power density of 3925 W/kg. Gelatin, casein and carboxymethyl cellulose-based devices have shown device stability up to 1000 cycles. Detailed analysis on the charge storage mechanisms (e.g., involving faradaic and non-faradaic processes) at the electrode/electrolyte interface reveals a pseudocapacitance behavior within the supercapacitors. A clear correlation between the electrochemical performances (e.g., cycle stability, capacitance retention, series resistance value, coulombic efficiency) ageing phenomena and charge storage mechanisms within the porous carbon-based electrode have been discussed.

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Section: Resultsmentioning

confidence: 99%

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

et al. 2021

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“…2,8 Recently, super-concentrated salt solutions have been considered as electrolytes for supercapacitors (SCs) with an expanded electrochemical stability window and reduced selfdischarge. [15][16][17] However, in typical gel electrolytes for SSSCs, concentrations of salts are in the range of 0.5 to 4 M. 4,12,14,18,19 Gel electrolytes with super-concentrated salt content larger than 10 M for SCs have been rarely reported. 20 This may be because most reported gel electrolytes for SCs are based on polymers such as polyvinyl alcohol (PVA), which are usually prepared via dissolution followed by coagulation in electrolyte solutions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogels with highly concentrated salt solution as electrolytes for solid-state supercapacitors with a suppressed self-discharge rate

et al. 2022

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“…After the floating process, the I D /I G ratio increased to 1.33, leading to a greater number and/or size of sp 2 clusters. The Ragone plots for the SCs comprising the two eutectic mixtures are on par with SC comprising organic [4,20,37] media and superior to SCs with aqueous [38–41] and DES media [24,26,27] …”

Section: Resultsmentioning

confidence: 93%

Non‐Flammable Sodium Asymmetric Imide Salt‐Based Deep Eutectic Solvent for Supercapacitor Applications

et al. 2022

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This study reports two deep eutectic solvents (DESs) based on alkaline imide salts with asymmetric anions as functional electrolytes for supercapacitor (SC) application. The eutectic mixture of sodium (fluorosulfonyl) (trifluoromethanesulfonyl) imide (NaFTFSI) or sodium cyano-trifluoromethanesulfonyl imide (NaTFSICN) with ethylene carbonate (EC) delivers a nonflammable and stable liquid. The eutectic diagrams of the electrolytes directed to an optimal composition (w salt = 0.25), hinging to that of conventional carbonate-based electrolytes, i. e., 1 mol L À 1 . The volumetric properties of the DESs revealed a "stacking" effect, reflecting a strong coordination bond between the imide and EC anions without solvating the Na + cations. The DES transport properties (i. e., viscosity, conductivity, and ionicity) and temperature variations designate a high organization, similar to ionic liquids. The DESs, when coupled with activated carbon electrodes in a two-electrode symmetric configuration, yield specific capacities of 150 F g À 1 at a normalized current density of 0.5 A g À 1 (and 120 F g À 1 at 2 A g À 1 ). The SC maintained 80 % of its initial capacity beyond 100 h of floating at an operating voltage of 2.4 V and showed a 150 mV per hour potential loss under self-discharge. The devised eutectic mixtures offer a promising new pathway for simple, safe, and effective electrolytes for SC applications.

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Interfacial aspects induced by saturated aqueous electrolytes in electrochemical capacitor applications

Cited by 24 publications

References 64 publications

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

A Comparative Evaluation of Sustainable Binders for Environmentally Friendly Carbon-Based Supercapacitors

Hydrogels with highly concentrated salt solution as electrolytes for solid-state supercapacitors with a suppressed self-discharge rate

Non‐Flammable Sodium Asymmetric Imide Salt‐Based Deep Eutectic Solvent for Supercapacitor Applications

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