Electrochromic Performance of Viologen-Modified Periodic Mesoporous Nanocrystalline Anatase Electrodes

We report for the first time on the electrochromic performance of viologen-modified periodic mesoporous nanocrystalline anatase, denoted meso-nc-TiO 2 -V(2+). Electrodes fashioned from meso-nc-TiO 2 -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-TiO 2 -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.