Infrared Electrochromic Devices Based on Thin Metal Films

Tunable emissivity technology is promising for the dynamic regulation of infrared radiation. Herein, electrochromic devices based on thin metal films that operate via a novel hydrogen-induced metal–insulator transition are demonstrated. The use magnesium–nickel (MgxNi) alloy as both variable material and top conductive electrode simplifies device structure ensures large changes in can be achieved. constructed sandwich-structured also have polyethyleneimine (PEI) middle proton-conducting electrolyte layer hydrogen tungsten bronze (HxWO3)/indium tin oxide (ITO) bottom ion-storage layer. Upon application voltage ±2.6 V, MgxNi/Pd/PEI/HxWO3/ITO reversibly regulated, with 0.48 0.43 3–5 7.5–14 µm atmospheric windows, respectively. Under open-circuit conditions, high-emissivity state stably maintained 3 h. change affected by composition thickness MgxNi film failure mechanism involves breakage oxidation this after cycling. Corresponding flexible exhibit electrochromism visible region great potential adaptive thermal camouflage, smart management, information displays.