Abstract
Vanadium pentoxide(V2O5)with a layered structure is of great interest in the field of electrochromic(EC)due to its abundance of color variations.However,there are still a series of problems such as slow ion diffusion,poor electronic conductivity and cyclic stability in the reaction process.Herein,we success-fully prepared a stable and fast multi-color electrochromic material V2O5-PEDOT by a simple"one-pot"method.The layer space of V2O5 could be tuned by 3,4-ethylenedioxythiophene(named V2O5-PEDOT)during the dissolution and recrystallization of vanadium oxide.The expanded layer spacing facilitates rapid ion insertion and extraction.PEDOT serves as an internal conductive pillar to improve the over-all conductivity of the material.The obtained intercrossing structure of the nanobelts shortens the ion diffusion distance and ensures electrolyte penetration.The V2O5-PEDOT exhibits the fast response time(1.1s for coloration and 3.5 s for bleaching at 422 nm),high optical contrast(△T=45％at 422 nm and△T=35.2％at 1000 nm),great coloration efficiency(CE=97.1 cm2/C),and high cyclic stability(86％pre-served after 3000 cycles).The electrochromic devices(ECD)were successfully assembled by using V2O5-PEDOT films as ion storage layers and electrochromic layers,demonstrating remarkable performance.
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