Effect of different acid and lithium salt used in polyethylene glycol-titanium oxide based solvent-free electrolytes on electrochromic performance of WO3 thin films
Por:
Mendoza N., Paraguay-Delgado F., Hu H.
Publicada:
1 abr 2012
Resumen:
Polymeric nanocomposites of polyethylene glycol (PEG) with titanium oxide compound, PEG-Ti, are solvent-free viscous materials obtained by sol gel method in acidic medium. Lithium salt (LiX) has been added into PEG-Ti to form PEG-Ti-LiX polymeric electrolytes. Electrochromic devices based on tungsten oxide thin films and PEG-Ti-LiX electrolyte may show excellent optical contrast in the wavelength range from 300 to 2500 nm, however it depends on the type of lithium salt as well as the acid source used during the sol gel process. With LiI, the color change speed of the devices is very fast, but they show a yellow color at bleaching state. The use of LiClO4 makes the devices totally transparent in visible region, and the optical contrast is small. On the other hand, hydrochloric acid is good catalyst for hydrolysis of the titanium precursor during the sol gel process, but it also originates the yellowish appearance of the devices. The substitution of HCl by acetic acid makes the devices m
Filiaciones:
UNAM, Ctr Invest Energia, Temixco 62580, Morelos, Mexico
Centro de Investigación en Materiales Avanzados, Miguel de Cervantes 120, Chihuahua, Chih 31109, Mexico
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