Textural, Structural and Electrical Characterizations of EMIMAc Silica Ionogels and Their Corresponding Aerogels

Bengourna, Nadjette; Despetis, Florence; Bonnet, Laurent; Courson, Rémi; Solignac, Pierre; Satha, Hamid; Olivi-Tran, Nathalie

doi:10.5539/apr.v6n4p16

Cited by 4 publications

(5 citation statements)

References 21 publications

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“…the hydrolysis and condensation processes, counterbalancing the fast gelation tendency at high temperatures (to some extent). We rationalise that the presence of stable ≡Si-CH 3 groups in the silica monolith partially offsets the mechanical stress and thus the overall brittleness of the ionogels [19]. Fig.…”

Section: Resultssupporting

confidence: 68%

Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

Janani

Mader

Roberts

et al. 2018

Journal of Power Sources

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Fast-cure 1-ethyl-3-methylimidazolium trifluoromethanesulfonate based ionogels have been realised for the first time. The influence of curing temperature on the structure of ionogels and their performance as the electrolyte for electric doublelayer capacitors (EDLCs) has been investigated. Hybrid ionogels were synthesised via a non-hydrolytic sol-gel route and were fully gelled post heat-treating at 125, 150, 175 and 200 °C for 60 min with minimal shrinkage. Charge-transfer resistance (a rate-limiting parameter in cell kinetics during charge/discharge cycles) was reduced by ∼80% by increasing the heat-treatment temperature; this was partially attributed to the interlocking effect facilitated by high curing temperature. We report a maximum areal capacitance of 95 mF cm −2. Due to ∼40% increase in the penetrability coefficient of the ionic liquid, the electrode 'full' wetting time dropped from 48 to 5 h when the curing temperature was increased above 150 °C. These results were supported by SEM and Raman spectroscopy to characterise the effect of high temperature heat-treatment on the electrode-ionogel interface and the degree of electrode wetting by the ionic liquid. The fast-cure fabrication process for ionogels removes one of the major hurdles in their industrial application while the improved room temperature ion transport kinetics expands the potential application of ionic liquid-based electrochemical systems.

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Section: Resultssupporting

confidence: 68%

Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

Janani

Mader

Roberts

et al. 2018

Journal of Power Sources

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“…However, extensive shrinkage of these ionogels over time (Figure 8e and f ) can result in the loss of electrode-ionogel contact and jeopardize the lifetime of the resultant EDLC. Mixing different alkoxysilanes together is often a way to improve the mechanical properties of the resultant ionogel 12,14 . However, attention must be paid to the compatibility of the precursors, as poor choice can result in heterogeneity in the gel (the more reactive precursor forms silica networks f aster).…”

mentioning

confidence: 99%

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

Janani

Farmilo

Roberts

et al. 2021

Journal of Non-Crystalline Solids

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“…By removing MTMS from the formulation the gelation period dropped to 1 hour. It has also been shown that gel scaffolds containing higher molar ratio of MTMS to TMOS, possess higher BET surface area [108]. This shows that the slight variations in the formulation can induce significant changes in the structure of the gel network.…”

Section: Influence Of Formulation On Ionogelsmentioning

confidence: 96%

Synthesis and characterisation of sol- gel based ionogels as electrolyte for supercapacitors

Janani¹

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vanced patent was awarded to R. A. Rightmire who was a chemist at Standard Oil Company of Ohio (SOHIO) [11]. In 1971, SOHIO licenced the double-layer capacitor technology to Nippon Electric Company (NEC) and by 1978, NEC's supercapacitor was commercialised. Rapid development of electric vehicles and mobile electronics called for more advancements in the battery and supercapacitor industry, and in 1990s more research funding was advocated by United States Department of Energy (DOE) due to an increasing awareness of the extensive applications of battery and supercapacitors [7]. Today, the application of supercapacitors in the fields of electronics and electrochemistry are diverse. They can be used to generate power and be a peak assist in industry or for automotive applications [4]. They can also replace or supplement batteries in consumer electronics. In addition, micro-sized supercapacitors are widely utilized in biosensors and microelectromechanical systems as an on-chip element [6]. Depending on the type of application, the requirements and thus, supercapacitor cell design may vary. Based on the mechanism of charge storage, supercapacitors are divided into three major types, namely electric double-layer capacitors, pseudocapacitors and hybrid cells. The following sections (2.2-2.4) provide an overview of their working principles. 2.2 Electric double-layer capacitors (EDLCs) 2.2.1 Electric double-layer models An EDLC consists of two electrodes separated by an ion permeable separator. The space between the electrodes is filled with a liquid or quasi-solid electrolyte and it usually consists of solvated positive and negative ions suspended in solvent(s), or moving inside the quasi-solid backbone. When an EDLC is charged, two layers with opposite charges form at each electrode-electrolyte interface; these layers are commonly described as electric double-layers and they resemble two capacitors in series (Figure 2.2).

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Textural, Structural and Electrical Characterizations of EMIMAc Silica Ionogels and Their Corresponding Aerogels

Cited by 4 publications

References 21 publications

Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

Fast-cure ionogel electrolytes with improved ion transport kinetics at room temperature

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

Synthesis and characterisation of sol- gel based ionogels as electrolyte for supercapacitors

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