A Visible Light-Near-Infrared Dual-Band Smart Window with Internal Energy Storage

By Sheng Cao, Shengliang Zhang, Tianran Zhang, Qiaofeng Yao, Jong‐Min Lee. Joule, 2019

233 citations recorded by the source corpus.

Summary The integration of electrochromic smart windows with energy storage is an appealing concept for green building development. Herein, we report a dual-band electrochromic energy storage (DEES) window capable of independent control of visible light (VIS) and near-infrared (NIR, solar heat) transmittance with a high internal charge storage. The key design feature is the use of composition-optimized Ta-doped nano-TiO2 nanocrystals as a multifunctional active material to deliver a high charge-storage capability concurrently with high bistability and long-cycle-life electrochromism in three distinct operating modes: (1) the VIS and NIR transparent “bright” mode; (2) the VIS transparent and NIR opaque “cool” mode; and (3) the completely opaque “dark” mode. The independent control of VIS (sunlight) and NIR (solar heat) modulation was successfully demonstrated in a DEES prototype with a high charge-storage capacity of 466.5 mA hr m−2 at 150 mA m−2 of current density.

Subfields: Electrical and Electronic Engineering, Polymers and Plastics

View Paper: https://www.semanticscholar.org/paper/4614c6c610398ae78ae91c78db7f365bcec0e37b