Redox-Active Hydrogel Polymer Electrolytes with Different pH Values for Enhancing the Energy Density of the Hybrid Solid-State Supercapacitor

Tang, Xiaohui; Lui, Yu Hui; Merhi, Abdul Rahman; Chen, Bolin; Ding, Shaowei; Zhang, Bowei; Hu, Shan

doi:10.1021/acsami.7b11849

Cited by 48 publications

(34 citation statements)

References 54 publications

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“…Moreover, the energy density can still be maintained at 11.3 Wh kg −1 when the power density increases to 6.5 KW kg −1 . The energy density is markedly superior to the LiClO 4 solution electrolyte with 8.2 Wh kg −1 at a power density of 6.2 KW kg −1 and those previously reported hydrogel‐based supercapacitors …”

Section: Resultsmentioning

confidence: 64%

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

et al. 2020

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Excellent mechanical properties are indispensable for the wide application of supercapacitors and various wearable devices. In this article, a novel double‐crosslinked hydrogel electrolyte (DC‐GPE) is prepared by the combination of the hydrophobic association of acrylamide with the amphiphilic monomer AEO‐9‐AC and the ionic complexation of acrylic acid with Fe3+ for the first time by a two‐step method. Owing to the dual energy dissipation network, the DC‐GPE exhibits an excellent tensile strength of up to 3.1 MPa, an elongation at break of more than 900 % and a toughness of 18.1 MJ m−3, which is far beyond the currently reported hydrogel electrolyte. Moreover, the ionic conductivity of the DC‐GPE achieves as high as 40.1 mS cm−1, which is 3 times higher than the corresponding LiClO4 solution electrolyte (12.3 mS cm−1). Besides, the activated carbon‐based supercapacitor assembled by the DC‐GPE shows excellent electrochemical performance, which is superior to most activated carbon‐based supercapacitors. These results demonstrate that the DC‐GPE shows a great application prospect in wearable devices like supercapacitors. Significantly, the new dual physical cross‐linking strategy improves the contradiction between the strength and the toughness of the gel electrolyte materials. And provides a new solution for preparing high‐strength as well as high‐toughness gel electrolyte.

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Section: Resultsmentioning

confidence: 64%

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

et al. 2020

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“…Furthermore, among the three supercapacitors, the A 0 D 15 –NaAc 1.2 based supercapacitor presents an excellent energy density of 28.3 Wh kg −1 at a power density of 200 W kg −1 , much greater than that of the A 15 D 0 –NaAc 1.2 based supercapacitor (19.0 Wh kg −1 ) and the A 7.5 D 7.5 –NaAc 1.2 based supercapacitor (25.7 Wh kg −1 ) (Figure g). All these supercapacitors offer better performance than most aqueous supercapacitors in energy density because of their higher operating voltage . For practical application purposes, we also evaluated the leakage current and self‐discharge of the A 0 D 15 –NaAc 1.2 based supercapacitor.…”

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confidence: 99%

Dissolution–Crystallization Transition within a Polymer Hydrogel for a Processable Ultratough Electrolyte

et al. 2019

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to be faced. Therefore, it's necessary to develop a new nonliquid electrolyte with comprehensive performance for fulfilling various energy devices.Hydrogel electrolyte with hydrated salt crystal may be a new candidate to solve the above requirements by the introduction of new phase. The hydrated salt crystals, as one kind of industrial liquid-solid phase change materials, can be immobilized into hydrogel by the facile dissolution-crystallization transition. The demonstrated polymer gel electrolyte with NaAc·3H 2 O crystal as aligned porous template was designed by the in situ supersaturated crystallization of NaAc. [16,17] The introduction of inorganic crystal into polymer hydrogel can form the inorganic-organic composite with enhanced mechanical strength due to hydrogen bond or other synergistic effects. [18,19] The bound hydrated salt can suppress the electrochemical activity of water and broaden operating voltage of aqueous electrolyte [20] due to the strong interaction with water molecules, similar to the solvation sheath in "waterin-salt" electrolyte. [21][22][23] The high-concentrated salts within crystal-type gel can also efficiently reduce the freezing point and increase the boiling point of aqueous solutions. [24] At last, the hydrated salt crystal can endow gel electrolytes with thermalresistant performance through liquid-solid phase transition accompanied by endothermic and exothermic phenomena. [25,26] All in all, the crystal-type composite gel electrolyte can realize the comprehensive performance, including ultrahigh toughness, high operating voltage, extreme temperature tolerance, and good interfacial compatibility by a facile dissolution-crystallization transition approach.In this work, the pioneering crystal-type composite gel with excellent performance was prepared using a facile method that employed the crystallization of NaAc. There are only three main components in the precursor solution (Figure 1a,b): distilled water, abundant soluble salt, and a certain amount of monomer (or macromolecule). First, a high concentration of the salt solution was prepared by dissolving excessive soluble salt in the distilled water at high temperature. Then, the hydrogel was formed by UV irradiation for monomer solution (Figure 1c). Finally, the supersaturated salt within hydrogel was initiated to crystallize by placing a small crystal particle as seed on the surface of the hydrogel, and soon the crystal-type composite gel with extensive soluble salt crystals was obtained (Figure 1d). Typically, the crystal-type composite gel containing 15 wt% acrylamide (AAm) monomer and a certain quality of

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“…4e), which was much larger than that of the supercapacitors based on PAANa-DPDH 6 (17.2 Wh kg −1 ) or PAANa-NaAc 6 (15.6 Wh kg −1 ). Furthermore, the PAANa-ST 6 -based supercapacitor offered better performance than most aqueous supercapacitors in terms of energy density because of its higher operating voltage and the hydrated salts containing faradic capacitance in the PCCE [47][48][49][50][51] . The comprehensive performance of the composite electrolyte developed in this work was an objective improvement over conventional solid electrolytes ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Water-mediated crystallohydrate–polymer composite as a phase-change electrolyte

et al. 2020

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With the world's focus on wearable electronics, the scientific community has anticipated the plasticine-like processability of electrolytes and electrodes. A bioinspired composite of polymer and phase-changing salt with the similar bonding structure to that of natural bones is a suitable electrolyte candidate. Here, we report a water-mediated composite electrolyte by simple thermal mixing of crystallohydrate and polymer. The processable phase-change composites have significantly high mechanical strength and high ionic mobility. The wide operating voltage range and high faradic capacity of the composite both contribute to the maximum energy density. The convenient assembly and high thermal-shock resistance of our device are due to the mechanical interlocking and endothermic phase-change effect. As of now, no other non-liquid electrolytes, including those made from ceramics, polymers, or hydrogels, possess all of these features. Our work provides a universal strategy to fabricate various thermally manageable devices via phase-change electrolytes.

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Redox-Active Hydrogel Polymer Electrolytes with Different pH Values for Enhancing the Energy Density of the Hybrid Solid-State Supercapacitor

Cited by 48 publications

References 54 publications

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

Highly Strong and Tough Double‐Crosslinked Hydrogel Electrolyte for Flexible Supercapacitors

Dissolution–Crystallization Transition within a Polymer Hydrogel for a Processable Ultratough Electrolyte

Water-mediated crystallohydrate–polymer composite as a phase-change electrolyte

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