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Vibrational, electrical, dielectric and optical properties of PVA-LiPF6 solid polymer electrolytes

Abarna S., Hirankumar G.

Materials Science Poland

2019

Vol. 37, No. 3

331--337

Solid polymer electrolytes based on polyvinyl alcohol (PVA) doped with LiPF6 have been prepared using solution casting technique. Electrical properties of prepared electrolyte films were analyzed using AC impedance spectroscopy. The ionic conductivity was found to increase with increasing salt concentration. The maximum conductivity of 8.94 × 10-3 S∙cm-1 was obtained at ambient temperature for the film containing 20 mol% of LiPF6. The conductivity enhancement was correlated to the enhancement of available charge carriers. The formation of a complex between the polymer and salt was confirmed by Fourier transform infrared spectroscopy (FT-IR). The optical nature of the polymer electrolyte films was analyzed through UV-Visspectroscopy.

Current Fluctuation Measurements of Amperometric Gas Sensors Constructed with Three Different Technology Procedures

Sedlak P., Kubersky P., Skarvada P., Hamacek A., Sedlakova V., Majzner J., Nespurek S., Sikula J.

Metrology and Measurement Systems

2016

Vol. 23, nr 4

531--543

Electrochemical amperometric gas sensors represent a well-established and versatile type of devices with unique features: good sensitivity and stability, short response/recovery times, and low power consumption. These sensors operate at room temperature, and therefore have been applied in monitoring air pollutants and detection of toxic and hazardous gases in a number of areas. Some drawbacks of classical electrochemical sensors are overcome by the solid polymer electrolyte (SPE) based on ionic liquids. This work presents evaluation of an SPE-based amperometric sensor from the point of view of current fluctuations. The sensor is based on a novel three-electrode sensor platform with solid polymer electrolytes containing ionic liquid for detection of nitrogen dioxide − a highly toxic gas that is harmful to the environment and presenting a possible threat to human health even at low concentrations. The paper focuses on using noise measurement (electric current fluctuation measurement) for evaluation of electrochemical sensors which were constructed by different fabrication processes: (i) lift-off and drop-casting technology, (ii) screen printing technology on a ceramic substrate and (iii) screen printing on a flexible substrate.

Trifluorooctan 1-butylo-3-metyloimidazoliowy jako czynnik przewodzący w stałych elektrolitach polimerowych

Dembna A., Andrzejewska E., Stępniak I.

Przemysł Chemiczny

2013

T. 92, nr 9

1582-1584

Otrzymano stałe elektrolity polimerowe (SEP) zawierające 80% mas. cieczy jonowej trifluorooctanu 1-butylo-3-metyloimidazoliowiego ([BMIm] [ATf]) oraz 20% matrycy polimerowej na bazie di(met)akrylanów etoksylowanych bisfenoli A i F. SEP otrzymano in situ techniką fotopolimeryzacji. Uzyskane SEP wykazują znacznie większe wartości przewodności elektrolitycznej (1,1–1,6·10-2 S/cm) niż użyta w nich jako czynnik przewodzący IL (0,326·10-2 S/cm). Otrzymane SEP zastosowano jako elektrolit i separator w kondensatorze elektrochemicznym. Pojemności właściwe dla kondensatorów elektrochemicznych z SEP mieściły się w zakresie 50–70 F/g.

1-Butyl-3-methylimidazolium trifluoroacetate ionic liq. and ethoxylated bisphenol F diacrylate and ethoxylated bisphenol A dimethacrylate crosslinking monomers (80:20 mass ratio) were used to prep. in situ solid polymer electrolytes by photopolymerization. Ionic cond. of the prepd. electrolyte 1.1–1.6·10-2 S/cm was significantly higher than the ionic cond. of the neat ionic liq. (0.326·10-2 S/cm). The specific capacity of electric double layer capacitors based on electrolyte was 50–70 F/g.