Electrochromic Properties of Asymmetric 4,4′-Bipyridinium Nanocomposites with Inorganic Nanoparticles
Asymmetric mono cationic 4,4′-bipyridiniums, 1-butyl-4,4′-bipyridinium bromide (BUBP) and 1-methyl-4,4′-bipyridinium iodide (MEBP) showed electrochromic properties from blue to transparent yellow. The electrochromic bipyridiniums, BUBP and MEBP, were introduced to solid state electrochromic cells by using a solution of the bipyridinium, TiO2, and polymer electrolyte composite. The 4,4′-bipyridinium derivatives was attached to TiO2 nanoparticles and decreased aggregation of TiO2 to afford EC dye-TiO2 nanoparticles with average diameter smaller than 20 nm, as determined by FE-SEM. An all solid state electrochromic cells prepared from the dye-TiO2 nanoparticles showed improved electrochromic response compared to that without TiO2. Thus the cell from the BUBP- TiO2 nanoparticles responded to a step potential of ±2 V within 7 sec with coloration efficiency of 117. The redox cyclability of the bipyridinium-TiO2 nanoparticles cell was longer than that of the TiO2 free cells. The enhanced properties were attributed to the conductivity and the large surface area of TiO2 nanoparticles.
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Document Type: Research Article
Publication date: 2010-01-01
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