Mo addition for improved electrochromic properties of V2O5 thick films

Issam Mjejri (1) , Manuel Gaudon (1) , Aline Rougier (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

Transition metal oxides (TMOs) have attracted considerable attention due to their variety of chromogenic properties. Among them, vanadium pentoxide (V2O5) has gained significant interest in respect of multichromism associated with orange, green and blue colors. Herein, we report a simple and easy method for the fabrication of Mo doped V2O5 thick films, leading to improved cyclability. Molybdenum doped vanadium pentoxide powders were synthesized from one single polyol route through the precipitation of an intermediate precursor: molybdenum doped vanadium ethyleneglycolate (Mo doped VEG). The as-synthesized Mo-doped V2O5 exhibits improved electrochromic performance in terms of capacity, cycling stability, and color contrast compared to single-component V2O5 in lithium as well as sodium based electrolyte. The improvement in EC performances lies in films of higher porosity as well as higher diffusion coefficients. To conclude, an electrochromic device combining Mo-V2O5 to WO3.2H2O, via a PMMA-lithium based electrolyte membrane exhibits simultaneously reversible color change from yellow to green for Mo-V2O5 and from blue to yellow white for WO3.2H2O with a cycling stability up to 10 000 cycles.

Mots clés: Polyol synthesis; Vanadium oxide; Electrochromism; Mo-doping; Device

Domaines: Matériaux

Issam Mjejri, Manuel Gaudon, Aline Rougier. Mo addition for improved electrochromic properties of V2O5 thick films. Solar Energy Materials and Solar Cells, 2019, 198, pp.19-25. ⟨10.1016/j.solmat.2019.04.010⟩. ⟨hal-02143521⟩