Electrochromic performance of Zn-Ti-O composite thin film with electrolyte dependence

Zn-Ti-O composite thin film prepared on FTO by sol-gel technique is discovered presenting electrochromic behavior in electrolytes with Li + ion (LiClO 4 ) and K + (KCl) as well. The observed EC colored/bleached switching is electrolyte dependent which is blue-green/transparent in LiClO 4 and gray-blue/transparent in KCl, respectively. Accordantly, the respective most optical modulation (Δ T ) between colored and bleached states is ~ 32% (710 nm) in LiClO 4 and ~ 37% (600 nm) in KCl. The finding of appreciable steady EC durability with appealing visual optical contrast (Δ T ) in conventionally fabricated Zn-Ti-O thin film using with bigger/heavier K + electrolyte helps expanding the applicable components in EC device.