Water‐Deactivated Polyelectrolyte Hydrogel Electrolytes for Flexible High‐Voltage Supercapacitors

Wei, Junjie; Zhou, Jie; Su, Shasha; Jiang, Jiulei; Feng, Jing; Wang, Qigang

doi:10.1002/cssc.201801277

Cited by 76 publications

(32 citation statements)

References 53 publications

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“…S7, the absorption peak at 964 cm −1 is assigned to the stretching vibration of -N(CH 3 ) 3 + functional groups and the peak at 1540 cm −1 is characteristic of C=O asymmetric stretching of the carboxylate anion. These features clearly confirm the coexistence of positive -N(CH 3 ) 3 + and negative -COO − functional groups in all the samples [32,33]. Compared with the p(MAA-MAPTAC), the CGs feature an absorbance peak of C=O stretching vibration at…”

Section: Resultssupporting

confidence: 64%

Regenerated hydrogel electrolyte towards an all-gel supercapacitor

Shang

et al. 2021

Sci. China Mater.

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Electrolyte regeneration is an important goal for environmental protection and sustainable development efforts. Herein, we report a facile strategy inspired by the transformation of edible dough from flour to regenerate hydrogel electrolytes from their dehydrated copolymer granules (CGs) via direct addition of water or salt solution. With the aid of heating, this procedure is efficient, relatively quick, and easily implemented. The dehydrated CGs are lightweight, reusable and stable under long-term storage. Even after 5 cycles of dehydration and regeneration, the regeneration efficiency of the hydrogel electrolytes, as evaluated based on retention of mechanical strength, is over 60%. The regenerated electrolytes possess considerable ionic conductivity, reprocessability, and 3D-printability. Furthermore, an all-gel supercapacitor assembled from the regenerated hydrogel electrolyte and activated carbon electrode with CGs as binder demonstrates excellent interfacial compatibility. The assembled all-gel supercapacitor can maintain 98.7% of its original specific capacitance after 100 bending tests, and can operate in a wide temperature range spanning from −15 to 60°C. This work may provide a new access to the development of renewable materials for various applications in the fields of intelligent devices, wearable electronics and soft robotics.

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Section: Resultssupporting

confidence: 64%

Regenerated hydrogel electrolyte towards an all-gel supercapacitor

Shang

et al. 2021

Sci. China Mater.

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“…To further improve the crystal‐type composite gel, 3‐dimethyl(methacryloyloxyethyl) ammonium propane sulfonate (DMAPS; Figure S1, Supporting Information) was used as a zwitterionic monomer to prepare the zwitterionic crystal‐type composite gel electrolyte. This is because the zwitterionic gel electrolyte was proven to be a promising gel electrolyte catering for energy storage devices . The crystal‐type composite gel were recorded as “A x D y –NaAc z ” according to the concentration of the two monomers and the mass ratio of NaAc.…”

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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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“…[ 1 ] The hydrogels are polymeric materials that absorb and retain large amounts of water while maintaining their 3D structure. [ 2 ] Owing to their high hydrophilicity, excellent flexibility, [ 3 ] and adjustable porous structure, [ 4 ] they are widely applied in the flexible electronic biosensors, [ 5 ] soft robots, [ 6 ] and catalyst supports. [ 7 ] Especially, it has become the hot spots and frontiers for biomass‐based hydrogels to make full use of abundant biomass resources and develop environment‐friendly green products based on their inherent biocompatibility, biodegradability, and lightweight properties.…”

Section: Introductionmentioning

confidence: 99%

Durable Photoetching Magnetic Biomass‐Based Hydrogel with High Performance

Zhang

et al. 2021

Adv Materials Inter

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Benefiting from the economic raw materials and efficient f abrication process, it is easy to directly scale up the hydrogels for biomedical scaffolds, functional materials, and storage systems. However, it remains challenging to construct stable hydrogel combining photoetching technology with low‐cost, room‐temperature, and low‐pressure fabrication. Here, a novel photoetching microcrystalline cellulose (M C C) @ Fe3O4/lignin‐Ca2+ hydrogel with excellent compressive strength (up to 300 kPa) is reported and its elasticity is well maintained under the temperature (−25–100 °C). Interestingly, the magnetic hydrogel exhibits controllable photoetching patterns based on the photothermal effect of Fe3O4 nanoparticles under near‐infrared irradiation (808 nm), especially in the different circumstances including enclosed space and underwater condition. In addition, the magnetic hydrogel displays the outstanding fire resistance and UV absorption (100%). The photoetching magnetic cellulose‐based hydrogel has great potential toward environmental‐friendly devices and applications in optics, electronics, sensors, and other miniature devices.

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Water‐Deactivated Polyelectrolyte Hydrogel Electrolytes for Flexible High‐Voltage Supercapacitors

Cited by 76 publications

References 53 publications

Regenerated hydrogel electrolyte towards an all-gel supercapacitor

Regenerated hydrogel electrolyte towards an all-gel supercapacitor

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

Durable Photoetching Magnetic Biomass‐Based Hydrogel with High Performance

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