In situ formation of polyethylene glycol-titanium complexes as solvent-free electrolytes for electrochromic device application

被引:15
作者
Hechavarria, Liliana [1 ]
Mendoza, Narcizo [1 ]
Altuzar, Patricia [1 ]
Hu, Hailin [1 ]
机构
[1] UNAM, Ctr Invest Energia, Temixco 62580, Morelos, Mexico
关键词
Polyethylene glycol; Titanium compound; Hybrid materials; Solvent-free electrolytes; Solid electrochromic devices; SOLID-STATE; SOLAR-CELLS; POLYMER-ELECTROLYTES; GEL ELECTROLYTE; FILMS;
D O I
10.1007/s10008-009-0850-1
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Transparent and ionic conductive polymeric electrolytes have been prepared through sol-gel method by adding titanium isopropoxide into an acidic polyethylene glycol (PEG) solution. After hydrolysis and condensation processes, new associations between titanium cations and ether oxygen atoms of PEG have been formed according to Fourier-transform infrared spectroscopy. Thermogravimetric analysis results of these hybrid materials indicate a better thermal stability with a less polydispersion of the molecular mass distribution in comparison with PEG. For the purpose of electrochromic or photoelectrochromic device applications, LiI was added into the hybrid materials to form solvent-free polymeric electrolytes. Optical transmittance spectra of these electrolytes show a red shift of the cutoff wavelength as a function of titanium isopropoxide percentage in the original sol-gel solutions. It is also observed that the amount of hydroxyl groups in the hybrid materials was reduced in comparison with the PEG one. This makes electrical conductivity of the hybrid electrolytes with LiI salt insensitive to humidity and solvents, which was about 2 x 10(-4) Omega(-1) cm(-1) at room temperature. A solid WO3-based electrochromic device with the hybrid electrolyte keeps the same optical transmittance value after 1,000 cycles of switching polarization potentials between -1 and +1 V.
引用
收藏
页码:323 / 330
页数:8
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