Electrical and electrochemical properties of imidazolium and phosphonium-based pNIPAAM ionogels

Gil-González, Nerea; Benito‐Lopez, Fernando; Castaño, E.; Morant‐Miñana, Maria C.

doi:10.1016/j.electacta.2020.136167

Cited by 4 publications

(7 citation statements)

References 52 publications

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“…As can be seen, the changes in resistance are negligible for the tested relative humidity. This effect is in agreement with the low diffusion values measured for the IL when it is encapsulated in the polymeric matrix [16] corroborating the protective role of the pNIPAAM without the need of using hydrophobic or highly viscous anions. In addition, the use of the IL overcome the limitations of the traditional gas sensors towards hot and dry environments since do not suffer evaporation effects like water or organic containing simplifying the sensor design.…”

Section: Resultssupporting

confidence: 87%

“…As can be seen in Fig. S1, the baselines of both materials present a drift towards higher resistance which could be produced by the adsorption of anions and/or cations at the IL-metal surfaces [16]. As a consequence, the number of ions responsible for charge transport is reduced, increasing the baseline resistance.…”

Section: Resultsmentioning

confidence: 94%

“…The excellent electrical con-tact between the IO and the sensing electrode has been proven by monitoring morphology changes caused by an external stimulus [15]. Moreover, the presence of the polymeric matrix protects the IL from moisture making it suitable for to normal ambient conditions [16].In this work, we report the use of a IO gas sensor consisting of a [C2mim][EtSO4] IL immobilized in a pNIPAAM matrix for the detection of common air pollutants such as C6H6andHCHO at room temperature. The film sensor is integrated onto interdigitated electrodes, and its sensing performance was investigated in the presence of two carrier gases and com-pared with the neat IL.…”

Section: Introductionmentioning

confidence: 99%

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Imidazole-based ionogel as room temperature benzene and formaldehyde sensor

et al. 2020

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A room temperature benzene and formaldehyde gas sensor system with an ionogel as sensing material is presented. The sensing layer is fabricated employing poly(Nisopropylacrylamide) polymerized in the presence of 1-ethyl-3-methylimidazolium ethylsulfate ionic liquid onto gold interdigitated electrodes. When the ionogel is exposed to increasing formaldehyde concentrations employing N2as a carrier gas, a more stable response is observed in comparison to the bare ionic liquid, but no difference insensitivity occurs. On the other hand, when air is used as carrier gas the sensitivity of the system towards formaldehyde is decreased by one order of magnitude. At room temperature, the proposed sensor exhibited in air higher sensitivities to benzene, at concentrations ranging between 4 and 20 ppm resulting, in a limit of detection of 47 ppb, which is below the standard permitted concentrations. The selectivity of the IL towards HCHO and C6H6is demonstrated by the absence of response when another IL is employed. Humidity from the ambient air slightly affects the resistance of the system proving the protective role of the polymeric matrix. Furthermore, the gas sensor system showed fast response/recovery times considering the thickness of the material, suggesting that ionogel materials can be used as novel and highly efficient volatile organic compounds sensors operating at room temperature.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Imidazole-based ionogel as room temperature benzene and formaldehyde sensor

et al. 2020

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“…[ 20,34,35 ] More recently, polyelectrolyte complexes that are composed of polyanions (or polycations) and counterions exhibited great promise to be used as polymer electrolyte for flexible supercapacitors with high performance, due to their high ionic conductivity and mechanical flexibility. [ 6–8 ] Due to the strong electrostatic interaction between polyelectrolytes and their counterions, the heterogeneous polyelectrolyte formed by a polyanion complex and a polycation complex showed an interesting current rectification effect, [ 36–41 ] which may be used to prolong the self‐discharge time of ASCs. Therefore, it is highly worthy to investigate the possibility of the heterogeneous polyelectrolyte to suppress the self‐discharge behavior in ASCs with high energy density.…”

Section: Introductionmentioning

confidence: 99%

“…[1,2] Supercapacitors not only have high power density, ultralong lifetime, and excellent safety, but also can be easily fabricated into flexible formats. [3][4][5] Until now, most of the flexible polyelectrolyte formed by a polyanion complex and a polycation complex showed an interesting current rectification effect, [36][37][38][39][40][41] which may be used to prolong the self-discharge time of ASCs. Therefore, it is highly worthy to investigate the possibility of the heterogeneous polyelectrolyte to suppress the self-discharge behavior in ASCs with high energy density.…”

Section: Introductionmentioning

confidence: 99%

Flexible Asymmetric Supercapacitors with Extremely Slow Self‐Discharge Rate Enabled by a Bilayer Heterostructure Polymer Electrolyte

Wan

Liu

et al. 2021

Adv Funct Materials

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Asymmetric supercapacitors (ASCs) with high working voltages, power density, and long cyclic life have attracted widespread interest. Along with their rapid charge process, the ASCs also exhibit fast self-discharge behavior, which remains a big challenge. Unfortunately, very limited studies have been focused on this crucial issue. Here, a flexible asymmetric supercapacitor with excellent electrochemical performance and ultra-long self-discharge time is reported, which is enabled by designing a bilayer heterogeneous polymer electrolyte (HPE) of polyanions/polycations between the positive electrode and the negative electrode. The developed HPE-based ASCs exhibit comparable electrochemical performance with those of ASCs by using homogeneous polymer electrolytes. The existing repulsive force between the charged polyelectrolytes and the movable ions can efficiently restrict the diffusion and the redistribution of the small ions, which gives the fully charged HPE-based ASC an extremely long self-discharge time of 110 h as the open-circuit voltage decreases to half of its original value, over ten times longer than the devices based on homogeneous polymer electrolytes. This work indicates that the self-discharge rate of ASCs can be efficiently suppressed by using the heterogeneous polymer electrolyte, which is helpful in the context of broadening their applications in the field of flexible electronics.

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