Inorganic salt grafted ionic liquid gel electrolytes for efficient solid state supercapacitors: Electrochemical and dielectric studies

Pilathottathil, Shabeeba; Kottummal, Thasneema Kannan; Thayyil, Mohamed Shahin; Perumal, Pillai Mahadevan; Purakakath, Jemshihas Ambichi

doi:10.1016/j.molliq.2018.05.014

Cited by 23 publications

(8 citation statements)

References 19 publications

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“…The main reason was that the gel crosslinking agent used contained more crosslinking sites, which increased the crosslinking density of the gel, and the three-dimensional network structure of the gel was stable and the structural force was strong [58]. Meanwhile, the crosslinking site weakened the blocking effect of inorganic metal salt ions on the molecular chain, and the loss modulus changed little [59]. It can be found from Figure 14 that the storage modulus of the gel was larger than the loss modulus at the same angular frequency, indicating that the gel was dominated by elasticity and had a good gelation effect under the condition of univalent salt ion concentration.…”

Section: Effect Of Univalent Salt Ion Concentration On Gelationmentioning

confidence: 99%

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

Yang

Bai

Sun

et al. 2022

Gels

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Polymer gel lost circulation control technology is a common and effective technique to control fractured lost circulation. The performance of a lost circulation control agent is the key to the success of lost circulation control techniques. In this study, rheological tests were used to study the physical and chemical properties of a shear thixotropic polymer gel system, such as anti-dilution, high temperature resistance and high salt resistance. The results showed that the shear thixotropic polymer gel system had the ability of anti-dilution, and the gel could be formed under a mixture of 3 times volume of heavy salt water and 3/7 volume white oil, and could keep the structure and morphology stable. Secondly, the gel formation time of shear thixotropic polymer gel system could be controlled and had good injection performance under the condition of 140 °C and different initiator concentrations. Meanwhile, the shear thixotropic polymer gel system had the ability of high temperature and high salt resistance, and the gel formation effect was good in salt water. When the scanning frequency was 4 Hz and the temperature was 140 °C, the storage modulus (G′) of the gel was 4700 Pa. The gel was dominated by elasticity and had excellent mechanical properties. By scanning electron microscope observation, it was found that the shear thixotropic polymer gel system had a stable three-dimensional reticular space skeleton under the condition of high salt, indicating that it had excellent ability to tolerate high salt. Therefore, the shear thixotropic polymer gel had high temperature and high salt resistance, dilution resistance and good shear responsiveness. It is believed that the results presented in this work are of importance for extending real-life applications of shear thixotropic polymer gel systems.

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Section: Effect Of Univalent Salt Ion Concentration On Gelationmentioning

confidence: 99%

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

Yang

Bai

Sun

et al. 2022

Gels

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“…1–3 However, the need for high-ionic conductivity and excellent mechanical properties makes SPEs a relevant research subject in the industrial application of ASSCs. 4–8…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] However, the need for highionic conductivity and excellent mechanical properties makes SPEs a relevant research subject in the industrial application of ASSCs. [4][5][6][7][8] Polyethylene oxide (PEO) is a commonly used material in SPEs owing to its low weight, excellent exibility, and good interfacial compatibility. It is highly porous and provides channels for ionic transport, thus enabling salt ions to ll the pores.…”

Section: Introductionmentioning

confidence: 99%

Solid polymer electrolytes reinforced with porous polypropylene separators for all-solid-state supercapacitors

Liu,

Li,

Pan

et al. 2023

RSC Adv.

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“…12 Interestingly, poly(vinyl alcohol) (PVA), which is a cheap, colorless, nontoxic, noncorrosive, biodegradable, and water-soluble polymer, has been widely applied as an organic matrix toward solid electrolytes containing inorganic materials (KOH, NaOH, H 2 SO 4 , LiCl, and so on). 13 In the gelation process, the typical chain structure of PVA favors the uniform molecule-level location of these inorganic materials in the hydrogel via binding interactions. 14 With the comprehensive considerations above, in this work we developed a simple yet efficient activation methodology from the inside out for scalable fabrication of porous carbons by using a PVA-KOH hydrogel as a precursor.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Besides the activators, the rational choice of carbon precursors is also of great significance to efficient fabrication of advanced porous carbons because of their special functional group, element composition, and microstructures . Interestingly, poly(vinyl alcohol) (PVA), which is a cheap, colorless, nontoxic, noncorrosive, biodegradable, and water-soluble polymer, has been widely applied as an organic matrix toward solid electrolytes containing inorganic materials (KOH, NaOH, H 2 SO 4 , LiCl, and so on) . In the gelation process, the typical chain structure of PVA favors the uniform molecule-level location of these inorganic materials in the hydrogel via binding interactions …”

Section: Introductionmentioning

confidence: 99%

Efficient Activation Engineering from the Inside Out toward Hierarchically Porous Carbon Framework as Electrode Materials for Supercapacitors

Zhang

Chen

et al. 2022

ACS Appl. Energy Mater.

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Over the past decades, the KOH-involved activation has been established to obtain porous carbons for supercapacitors. However, from the perspective of economic efficiency and practicability, it is significant yet urgent to explore a simple way to minimize the use of corrosive KOH for efficient fabrication of supercapacitive carbons without sacrificing electrochemical properties. Herein, we first develop a simple yet efficient activation strategy from the inside out, where the KOH activator (∼40 wt %) is uniformly located in poly(vinyl alcohol) (PVA) hydrogel as the precursor, to fabricate a three-dimensional hierarchically porous carbon framework (denoted as PC-K). Compared with the porous carbon obtained by physically mixing KOH and PVA, the PC-K with hydrophilic surface is endowed with an even larger specific surface area, a higher pore volume, and higher-content mesopores, ensuring abundant active sites and rapid ion/electron transport. Such attractive merits result in encouraging electrochemical capacitances of the PC-K electrode with a loading of 5 mg cm–2 both in symmetric devices and three-electrode systems with 6 M KOH and 1 M H2SO4 as aqueous electrolytes, which is particularly better than other carbons synthesized with more KOH addition. More significantly, the contribution here provides a guiding methodology for the feasible commercial synthesis of advanced porous carbons toward next-generation supercapacitors.

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Inorganic salt grafted ionic liquid gel electrolytes for efficient solid state supercapacitors: Electrochemical and dielectric studies

Cited by 23 publications

References 19 publications

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

Experimental Study on Physicochemical Properties of a Shear Thixotropic Polymer Gel for Lost Circulation Control

Solid polymer electrolytes reinforced with porous polypropylene separators for all-solid-state supercapacitors

Efficient Activation Engineering from the Inside Out toward Hierarchically Porous Carbon Framework as Electrode Materials for Supercapacitors

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