Solid-state supercapacitor with impressive performance characteristics, assembled using redox-mediated gel polymer electrolyte

Jinisha, B.; Anilkumar, K. M.; Mani, Manoj; Ashraf, Chowdhury; Pradeep, V. S.; Jayalekshmi, S.

doi:10.1007/s10008-019-04428-w

Cited by 42 publications

(28 citation statements)

References 46 publications

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“…The charged ions formed by the electrochemical Faradaic redox reaction of the HQ-RMs were strongly adsorbed on the electrodes and had a low free diffusion rate into the bulk electrolyte under the polymer-gel electrolyte; therefore, the HQ-MSCs can exhibit low self-discharge rate behavior. Previous studies reported that a polymer-gel electrolyte with limited moisture exhibited a superiorly suppressed self-discharge rate compared to aqueous electrolytes because the limited moisture condition decreased the level of ion mobility from the surface of the electrode to the bulk electrolyte solution [46][47][48][49][50]. In addition, the charged species of the HQ-RMs formed during electrochemical capacitive behavior were adsorbed on the electrode surface, thereby suppressing the self-discharge process [49].…”

Section: Resultsmentioning

confidence: 99%

A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate

Kim

Lee

et al. 2021

Nanomaterials

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To effectively improve the energy density and reduce the self-discharging rate of micro-supercapacitors, an advanced strategy is required. In this study, we developed a hydroquinone (HQ)-based polymer-gel electrolyte (HQ-gel) for micro-supercapacitors. The introduced HQ redox mediators (HQ-RMs) in the gel electrolyte composites underwent additional Faradaic redox reactions and synergistically increased the overall energy density of the micro-supercapacitors. Moreover, the HQ-RMs in the gel electrolyte weakened the self-discharging behavior by providing a strong binding attachment of charged ions on the porous graphitized carbon electrodes after the redox reactions. The micro-supercapacitors with HQ gel (HQ-MSCs) showed excellent energy storage performance, including a high energy volumetric capacitance of 255 mF cm−3 at a current of 1 µA, which is 2.7 times higher than the micro-supercapacitors based on bare-gel electrolyte composites without HQ-RMs (b-MSCs). The HQ-MSCs showed comparatively low self-discharging behavior with an open circuit potential drop of 37% compared to the b-MSCs with an open circuit potential drop of 60% after 2000 s. The assembled HQ-MSCs exhibited high mechanical flexibility over the applied external tensile and compressive strains. Additionally, the HQ-MSCs show the adequate circuit compatibility within series and parallel connections and the good cycling performance of capacitance retention of 95% after 3000 cycles.

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Section: Resultsmentioning

confidence: 99%

A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate

Kim

Lee

et al. 2021

Nanomaterials

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“…Amorphous materials are required to improve the performance of supercapacitor electrolytes. [13,34,35] Here, the genetic DNA extracted from salmon sperm has been used as a model system. A fibrous DNA substance is easily constructed into an amorphous gel material by adding excess salt and temperatureinduced transitions of single strands.…”

Section: Synthesis and Physicochemical Characteristics Of Dna Gel Ele...mentioning

confidence: 99%

Flexible Supercapacitor with a Pure DNA Gel Electrolyte

Mitta¹,

Rana

Kim³

et al. 2022

Adv Materials Inter

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of charge storage has been driven by the advancement of batteries and supercapacitors applied for a variety of eco-friendly electronics and vehicles. [1,2] Supercapacitors are representative electrochemical systems that are attractive as advanced energy storage devices due to their higher power density, long cycle life, low cost, and easy fabrication. [3][4][5] Either organic [6] or inorganic [5,7] materials have been used in electrodes and electrolytes, which are major components in the electrochemical energy storage and conversion system. The development of electrolyte materials has been less emphasized than electrodes despite their importance. Due to

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“…Jinisha's group [23] reported a poly(vinyl alcohol) (PVA)potassium hydroxide-hydroquinone GPE that displayed superior ionic conductivity and flexibility. The assembled super-capacitor offered a high electrode specific capacitance of approximately 326.53 F g −1 and capacity retention of 84.2% after 1000 charge-discharge cycles.…”

Section: Introductionmentioning

confidence: 99%

Tough, self-healable, antifreezing and redox-mediated gel polymer electrolyte with three-role K3[Fe(CN)]6 for wearable flexible supercapacitors

et al. 2023

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Supercapacitors exhibiting toughness, selfhealing, and high specific capacitance have practical significance for use in flexible and wearable electronic equipment. To meet these requirements, a novel multifunctional gel polymer electrolyte (GPE) consisting of polyvinyl alcohol (PVA)-sodium alginate (SA)-K 3 [Fe(CN)] 6 -Na 2 SO 4 was prepared. In this GPE, K 3 [Fe(CN)] 6 plays three crucial roles by serving as a carrier donor, ionic crosslinking agent and redoxactive mediator. Consequently, the usual conflict between the conductivity and mechanical properties of GPEs is alleviated to some extent. In addition, the electrode specific capacitance and the energy density of the assembled supercapacitor are obviously improved because of the pseudocapacitance generated from the redox reaction of K 3 [Fe(CN)] 6 . Based on this GPE, the supercapacitor exhibits outstanding bending and stretching stabilities, significant self-healing, and anti-freezing properties. Therefore, the prepared GPE and supercapacitor are promising for application in flexible and wearable electronic equipment with complex service conditions.

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Solid-state supercapacitor with impressive performance characteristics, assembled using redox-mediated gel polymer electrolyte

Cited by 42 publications

References 46 publications

A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate

A Redox-Mediator-Integrated Flexible Micro-Supercapacitor with Improved Energy Storage Capability and Suppressed Self-Discharge Rate

Flexible Supercapacitor with a Pure DNA Gel Electrolyte

Tough, self-healable, antifreezing and redox-mediated gel polymer electrolyte with three-role K3[Fe(CN)]6 for wearable flexible supercapacitors

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