Molybdenum-doped vanadium pentoxide (Mo-doped V(2)O(5)) thin films with doping levels of 3-10 mol% were prepared by dip-coating technique from a stable Mo-doped V(2)O(5) films had a layered V(2)O(5) matrix structure along c-axis orientation with Mo(6+) as substitutes. Values of the inserted and extracted charge density of 21.4 and 21.3 mC.cm(-2) and the transmission variation (Delta T at 640 nm) between anodic (+1.0V) and cathodic (-1.0V) colored states of 41% were observed for the films with 5 mol% Mo(6+) doping. Above this dopant concentration, the charge capacity and Delta T decreased. The enhancement of the electrochemical and electrochromic properties of the films is related to changes in the electronic properties of V(2)O(5) films due to the creation of energy levels in the band gap of V(2)O(5) by the Mo doping, accompanied by the reduction of the forbidden-band width and the increase of the conductivity. (C) 2008 Elsevier B.V. All rights reserved.