Abstract
Abstract In an attempt to increase the room temperature ionic conductivity of a crystalline poly(ethylene oxide) (PEO)-based electrolyte, while maintaining its macromolecular characteristics, we used a liquid low molecular weight (LMW) analogue. This electrolyte has been studied in the photoelectrochemical cell n-CdSe//LMW-PEO/Na2S4//ITO, and investigated by ac impedance spectroscopy at temperatures between 0 and 60°C. The conductivity values are at least 1000 times larger than those of a high molecular weight (HMW) polymer electrolyte-based system, although the apparent activation energies for the ionic conductivity (Ea) are the same (0.4 eV) when amorphous phases are studied. The semiconductor flat-band potential (−0.74 V/NHE) and carrier concentration (3 × 1017 cm−3) were determined from the n-CdSe impedance diagrams.
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