The addition of up to 10 mol % cerium(III) during the synthesis of cubic mesoporous titania
thin films significantly increases the degree of mesostructural order in the final material.
Photocurrent measurements, cyclic voltammetry, and spectroelectrochemistry show that the
addition of cerium introduces a large number of interfacial states into the mesoporous
material, which act as electron traps. Electron trapping by individual cerium ions also causes
changes in the electrochemical properties of the mesoporous films. The mesoporous cerium-doped titania films show an increased electrochromic response that is indicated by an increase
in absorbance at 550 nm with respect to pure titania. This effect is counter to the behavior
of sol−gel ceria−titania films, which generally show a loss of electrochromism compared to
pure titania.
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