Spatially confined building of environmental-adaptive hydrogel electrolyte for supercapacitors

Yang, Leyi; Zhou, Guanbing; Jin, Yijie; Sun, Yan; Liu, Qiao; Chen, Chongyi

doi:10.1016/j.jpowsour.2022.232015

Cited by 8 publications

(4 citation statements)

References 51 publications

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“…Calculated parameters of equivalent circuit components for the device swollen with 0.5 m Na 2 SO 4 . PVA: Alg Freeze-thawed (10:1) 0.5 m Na 2 SO 4 (swollen) Graphite threads modified with PPy nanotubes 66 F g −1 @ 0.5 A g −1 Present work PVA-TA 2.8 m H 3 PO 4 (swollen) PANI@CNT 58 F g −1 @ 0.3 A g −1 [47] PVA-potassium Borate 30…”

Section: Quasi-solid-state Assembly and Electrochemical Characterizationmentioning

confidence: 95%

“…Alg/EMImBF 4 EMimBF 4 Alg/ACFC 88 F g −1 @ 10 mA cm −2 [49] PAA-D-S 2 m H 2 SO 4 (in situ) PANI@CNTs 39 F g −1 @ 0.2 mA cm −2 [47] Additionally, the spectra suggest an ejection of the ionic aqueous solution from the hydrogel, reflected as a rise in the ionic diffusion resistance values, represented by the W on the equivalent circuit. [41] As shown in Figure 4C, the osmotic pressure removes water from the hydrogel and modifies its mechanical and electrochemical properties.…”

Section: Quasi-solid-state Assembly and Electrochemical Characterizationmentioning

confidence: 98%

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Hydrogel‐Based Flexible Energy Storage Using Electrodes Based on Polypyrrole and Carbon Threads

Ruthes

Deller

Yambou

et al. 2023

Adv Materials Inter

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Developing new flexible and electroactive materials is a significant challenge to producing safe, reliable, and environmentally friendly energy storage devices. This study introduces a promising electrolyte system that fulfills these requirements. First, polypyrrole (PPy) nanotubes are electropolymerized in graphite‐thread electrodes using methyl orange (MO) templates in an acidic medium. The modification increases the conductivity and does not compromise the flexibility of the electrodes. Next, flexible supercapacitors are built using hydrogel prepared from poly(vinyl alcohol) (PVA)/sodium alginate (SA) obtained by freeze–thawing and swollen with ionic solutions as an electrolyte. The material exhibits a homogenous and porous hydrogel matrix allowing a high conductivity of 3.6 mS cm−1 as‐prepared while displaying great versatility, changing its electrochemical and mechanical properties depending on the swollen electrolyte. Therefore, it allows its combination with modified graphite‐thread electrodes into a quasi‐solid electrochemical energy storage device, achieving a specific capacitance (Cs) value of 66 F g−1 at 0.5 A g−1. Finally, the flexible device exhibits specific energy and power values of 19.9 W kg−1 and 3.0 Wh kg−1, relying on the liquid phase in the hydrogel matrix produced from biodegradable polymers. This study shows an environment friendly, flexible, and tunable quasi‐solid electrolyte, depending on a simple swell experiment to shape its properties according to its application.

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Section: Quasi-solid-state Assembly and Electrochemical Characterizationmentioning

confidence: 95%

Section: Quasi-solid-state Assembly and Electrochemical Characterizationmentioning

confidence: 98%

Hydrogel‐Based Flexible Energy Storage Using Electrodes Based on Polypyrrole and Carbon Threads

Ruthes

Deller

Yambou

et al. 2023

Adv Materials Inter

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show abstract

“…Hydrogel electrolyte (HE) composed of polymer material, water, salts and other components can inherit the advantages of liquid and solid state electrolytes such as relatively higher ionic conductivity, close contact with electrodes and high security. [109,110] Water as the main solvent is used to dissolve polymer and inorganic salts during preparation process. Inorganic salts provide the charge carriers during cycling.…”

Section: Polymer Introductionmentioning

confidence: 99%

Design Strategies and Recent Advancements for Low‐Temperature Aqueous Rechargeable Energy Storage

Sun

Liu

et al. 2023

Advanced Energy Materials

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Therefore, it is increasingly urgent to develop novel unfrozen aqueous electrolytes to balance electrochemical performance and demand under lowtemperature. Hence, we comprehensively discuss the anti-freezing mechanisms and the composition of low-temperature electrolytes, as well as summarizing recently related reports in a timeline of milestones in the development process of low-temperature ARES (Figure 1a). Inspired by those reported works, how to modulate and optimize the component of aqueous electrolytes to remain unfrozen under ultralow temperature with ideal ionic conductivity is of particular importance to enlarge their application scope.As the ionic transport mediums, electrolytes play a crucial role in ionic migration between cathode and anode electrodes during the electrochemical processes, which are generally composed of appropriate salts and solvents. [12,13] Compared with most frequently-used organic solvents, the high solidification point (0 °C, 1 atm) of pure water as the main solvent for aqueous electrolytes primarily leads to inferior ion transfer under low temperature, restricting the broad application of ARES. [11,14] Thus, understanding the root cause of the abnormal freezing point for water among chalcogen hydrides is an essential precondition to develop lowtemperature aqueous electrolytes. The most apparent difference in various pure chalcogen hydrides is the unique existence of hydrogen bonds (H-bonds) in the pure water system. [15,16] H-bond is the essence of the coordinate bond between lonepair electrons in the strongly electronegativity N, O, or F atoms and hydrogen atom with partial positive charge rather than the shared electron pair effect (Figure 1b). From the chemical composition, the polar water molecules containing two atoms of hydrogen and one atom of oxygen in per chemical formula are H-bonds acceptors and donors at the same time, because the oxygen side with two lone-pair electrons has negative charge and the hydrogen side has positive charge, which provide the condition for H-bonds formation. Subsequently, the viscosity of liquid water increases and H-bonds restrict the vibration of water molecules, boosting the formation of longrange ordered crystalline structure under subzero temperature. Theoretically, one water molecule can effectively interact with up to four nearest neighbor water molecules by H-bonds interaction to generate the self-associated water clusters, which has the short-range ordering in the form of tetrahedral H-bonds within the water clusters due to the sp 3 hybridization of O Aqueous rechargeable energy storage (ARES) has received tremendous attention in recent years due to its intrinsic merits of low cost, high safety, and environmental friendliness. However, the relatively higher freezing point of conventional aqueous electrolytes results in sluggish kinetics and inferior ion transport efficiency under low temperature, severely restricting their further development and practical applications. In order to deal with the existing issues, the design principles ...

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“…However, as hydrogel electrolytes are not sufficiently tolerant to subzero temperatures, their application in supercapacitors is presently limited. , To address this shortcoming, glycerol (a nontoxic, biodegradable, nonflammable, and eco-friendly agent) can be introduced into the polymer matrix. − In this context, PVA-based borate complexes (PVA/H 3 BO 3 ) have been shown to be particularly useful in the preparation of electrolytes, owing to the good chemical stability and noncombustibility of H 3 BO 3 . In general, boron-based GPEs (B-GPE) exhibit exceptional thermal stability and mechanical strength as well as remarkably low flammability …”

Section: Introductionmentioning

confidence: 99%

Nonflammable Supramolecular Polymer Electrolytes for Flexible and High-Performance Supercapacitor Applications

Gunday,

Cevik,

Bozkurt

et al. 2023

Energy Fuels

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Spatially confined building of environmental-adaptive hydrogel electrolyte for supercapacitors

Cited by 8 publications

References 51 publications

Hydrogel‐Based Flexible Energy Storage Using Electrodes Based on Polypyrrole and Carbon Threads

Hydrogel‐Based Flexible Energy Storage Using Electrodes Based on Polypyrrole and Carbon Threads

Design Strategies and Recent Advancements for Low‐Temperature Aqueous Rechargeable Energy Storage

Nonflammable Supramolecular Polymer Electrolytes for Flexible and High-Performance Supercapacitor Applications

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