Cerium‐Modified Mesoporous Antimony Doped Tin Oxide as Intercalation‐Free Charge Storage Layers for Electrochromic Devices

Charge storage layers are an important component of electrochromic devices, which expected to exhibit high capacity and transparency as well fast electron transfer rates. However, these often rely on the (de)intercalation ions into crystal lattice material therefore require optimization be compatible with non-intercalating electrolytes. In this report, post-modification mesoporous antimony-doped tin oxide (ATO) nanoparticle a redox-active cerium compound is described. particular, switching Ce3+/Ce4+ couple conductive scaffold demonstrated using tetrabutylammonium perchlorate electrolyte. Remarkably, capacities up 27 mC cm−2 transmittance values ≈90% achieved. Variation antimony doping concentration revealed that doped 15% Sb highest capacity, can attributed increased conductivity in potential range where Ce3+ oxidized. Finally, cerium-modified ATO films show promising performance charge device viologen-anchored layer working electrode. Switching times ≈0.4 s highlight capability cerium-decorated layer, even when electrolyte used.