Visible Light–Near-Infrared Dual-Band Electrochromic Device

We herein propose a proof of concept full dual-band electrochromic (EC) device able to selectively modulate solar light between 300 and 1600 nm. Dual-band control was achieved by exploiting the complementarity cooperation two earth-abundant nontoxic transition metal oxide nanocrystalline materials absorb different spectral regions when electrochemically charged. The active were obtained through microwave-based synthetic protocol produce massive amounts ligand-free water-soluble TiO2@WO3–x colloidal heterostructured nanocrystals. inorganic heterostructures deposited via spray-coating airbrushing method. Graphene adopted as near-infrared (NIR) transparent material for realization conductive substrates. nano-dimensions stable solubility during deposition process endorse development scattering-free nanostructured electrodes high transparency under open-circuit conditions, respectively. spectro-electrochemical properties as-made evaluated in relation pure WO3–x TiO2 single nanomaterials blend these. architecture ensures lower optical haze (around 8% total radiation) against blend, contributing improving overall EC performance. TiO2@WO3–x-based shows 67% NIR shielding while preserving 60% visible (VIS) cool-mode conditions 89% screening VIS radiation dark mode. These results represent an important step forward scalable devices.