We report for the first time on the electrochromic performance of viologen-modified periodic mesoporous nanocrystalline anatase, denoted meso-nc-TiO2-V(2+). Electrodes fashioned from meso-nc-TiO2-V(2+) were found to display enhanced color contrast yet have similar conduction band edge energy level and electron percolation ability as electrodes made from viologen-modified nanocrystalline titania, nc-TiO2-V(2+). This performance can be attributed to the uniform and ordered mesopore architecture, the nanocrystalline anatase wall structure, and the large accessible surface area for tethering viologen molecules.
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