Preparation and electrochromic properties of Li-doped MoO3 films fabricated by the peroxo sol–gel process

Molybdenum oxide (MoO3) films were prepared by the sol–gel process, using a lithium-doped peroxo-polymolybdate precursor solution. The highest quality films were obtained from precursor solutions containing 10% lithium. The structural properties of the films were characterized by TG-DTA and FTIR. The electrochemical and electrochromic properties were measured by cyclic voltammetry and an in-situ transmittance technique in 1 M LiClO4/propylene carbonate electrolyte. The results show that the Li-doped MoO3 films possess excellent electrochemical stability and reversibility, a remarkable change of transmittance (ΔT=32.3%) in visible region after coloration, and good electrochromic performance.