Sol-gel synthesis pathway and electrochemical performance of ionogels: A deeper look into the importance of alkoxysilane precursor

Janani, Ronak; Farmilo, Nicholas; Roberts, Alexander J.; Sammon, Chris

doi:10.1016/j.jnoncrysol.2021.120971

Cited by 6 publications

(5 citation statements)

References 63 publications

(91 reference statements)

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“…The impedance responses consist of a straight line in the low frequency region and a semicircle in the high frequency region. The intercept of suppressed semicircle in the high‐frequency region was related to the movements of ions in the bulk electrolyte 42 . The values of ionic conductivity calculated from the EIS response were consistent with that determined by R s .…”

Section: Resultssupporting

confidence: 78%

“…[37][38][39] Figure 8B presents the Nyquist plot of IPPy-Br-1 in the frequency of ions in the bulk electrolyte. 42 The values of ionic conductivity calculated from the EIS response were consistent with that determined by R s . For all the ILCP films, the conductivity increased with increase of temperature.…”

Section: Thermal Analysis and Liquid-crystalline Propertysupporting

confidence: 79%

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Self‐assembly and antistatic property of ionic liquid crystalline polymers

Tang

Yan

Wang

et al. 2022

Polymers for Advanced Techs

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Series of ionic liquid crystalline polymers (ILCPs) containing bipyridinium groups were synthesized by ionic self-assembly technology, and the chemical structure, selfassembly behavior, liquid crystalline property, and antistatic property were investigated by various techniques. All the polymers exhibit good thermotropic liquid crystal on heating cycle. The precursor bromo-polyesters displayed nematic phase, but the ILCPs (IPPy-Br, IPP-BF 4 and IPP-PF 6 series) containing bipyridine groups and different counter-anions showed smectic C phase. The effects of different counter-ions on liquid crystalline behavior were discussed in this study. The antistatic properties of these ILCPs were investigated by a four-probe measuring instrument. The surface resistivity was slight sensitivity to the surface water absorption due to the special structure of conductive channels of these ILCPs. It was found that all these ILCPs exhibited superior antistatic performance and ionic conductivity properties. In these ILCPs containing Br À , BF 4 À and PF 6 À counter-ions, the IPPy-BF 4 series of polymers with BF 4 À showed the maximum conductivity due to the influence of the BF 4 À anion in the ordered structure.

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Section: Resultssupporting

confidence: 78%

Section: Thermal Analysis and Liquid-crystalline Propertysupporting

confidence: 79%

Self‐assembly and antistatic property of ionic liquid crystalline polymers

Tang

Yan

Wang

et al. 2022

Polymers for Advanced Techs

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“…It was claimed that this results from the aggregation of ionic liquid. Meanwhile, the distorted CV plots could be due to the increasing internal resistance [ 47 ], Fontaine and Janani suggest that the deformed CV plots imply the resistive behavior of ionogel, behaving more like a resistor than a supercapacitor [ 48 , 49 ]. Moreover, the electrolyte–electrode charge transfer would also result in deviation from rectangular shape, while the reactions are considered pseudocapacitive provided that the charge transfer is reversible [ 50 ].…”

Section: Resultsmentioning

confidence: 99%

Investigating the Correlation between Electrolyte Concentration and Electrochemical Properties of Ionogels

et al. 2023

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Ionogels are hybrid materials comprising an ionic liquid confined within a polymer matrix. They have garnered significant interest due to their unique properties, such as high ionic conductivity, mechanical stability, and wide electrochemical stability. These properties make ionogels suitable for various applications, including energy storage devices, sensors, and solar cells. However, optimizing the electrochemical performance of ionogels remains a challenge, as the relationship between specific capacitance, ionic conductivity, and electrolyte solution concentration is yet to be fully understood. In this study, we investigate the impact of electrolyte solution concentration on the electrochemical properties of ionogels to identify the correlation for enhanced performance. Our findings demonstrate a clear relationship between the specific capacitance and ionic conductivity of ionogels, which depends on the availability of mobile ions. The reduced number of ions at low electrolyte solution concentrations leads to decreased ionic conductivity and specific capacitance due to the scarcity of a double layer, constraining charge storage capacity. However, at a 31 vol% electrolyte solution concentration, an ample quantity of ions becomes accessible, resulting in increased ionic conductivity and specific capacitance, reaching maximum values of 58 ± 1.48 μS/cm and 45.74 F/g, respectively. Furthermore, the synthesized ionogel demonstrates a wide electrochemical stability of 3.5 V, enabling diverse practical applications. This study provides valuable insights into determining the optimal electrolyte solution concentration for enhancing ionogel electrochemical performance for energy applications. It highlights the impact of ion pairs and aggregates on ion mobility within ionogels, subsequently affecting their resultant electrochemical properties.

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“…Ionogels are a new hybrid material class that confines the ionic liquids in a solid structure. [ 1 ] Ionic liquids (IL) are liquid salts comprised of anions and cations, exhibiting high thermal stability and negligible vapor at ambient temperature, thus responsible for the low flammability of ionic liquids. [ 2 ] The chemical composition and type of ionogel govern the properties of ionogel.…”

Section: Introductionmentioning

confidence: 99%

“…Confining ionic liquid will leverage the leakage issue incurred by ionic liquid while maintaining the high ionic conductivity. [ 1 ] Ionogels demonstrate high stability over time, even under reduced pressure, and retain the specific properties of IL, except for outflow. [ 3 ] In short, ionogels integrate the superiority of conductivity, nonvolatility and transparentness, enhancing their suitability in several energy‐related applications, such as solid electrolytes for lithium batteries, electrochemical actuators and capacitors.…”

Section: Introductionmentioning

confidence: 99%

The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications

Suen

Elumalai

Debnath

et al. 2022

Adv Materials Inter

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Ionogels have established themselves as an intriguing type of composites, owing to their distinctive properties, including superior thermal stability, non‐flammability, tunable electrochemical stability window, and high ionic conductivity. Hybrid materials based on ionic liquids (ionogels) are held together by interfaces arising out of intermolecular interactions, including electrostatic, van der Waals, solvophobic, steric, and hydrogen bonding. The interfaces within the ionic liquid (ILs) and its multifaceted interplay with the encapsulating matrix greatly influence the physicochemical and electronic/ionic interactions within the composite resulting in exceptional characteristics, allowing for the design of ionogels for targeted applications. Though ionogels have shown superior properties comparable to neat ILs, they still exhibit relatively low mechanical strength, limiting their application in several practical technologies. Simultaneous enhancement of mechanical durability while retaining high ionic conductivity is indispensable, which requires understanding interfaces and related influencing parameters. This review provides a synergetic comprehension, focusing on the interactive forces and factors affecting the conductivity, stability, and robustness of ionogels. Correlating with interfaces, several strategies, including the implications of nanofiller incorporation on the electromechanical properties of ionogel, are also elaborated. Finally, a primer is provided on the application of ionogels in sensors and energy harvesting technologies.

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Sol-gel synthesis pathway and electrochemical performance of ionogels: A deeper look into the importance of alkoxysilane precursor

Cited by 6 publications

References 63 publications

Self‐assembly and antistatic property of ionic liquid crystalline polymers

Self‐assembly and antistatic property of ionic liquid crystalline polymers

Investigating the Correlation between Electrolyte Concentration and Electrochemical Properties of Ionogels

The Role of Interfaces in Ionic Liquid‐Based Hybrid Materials (Ionogels) for Sensing and Energy Applications

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