Fast-switching dual-cathode electrochromic smart windows for year-round building energy savings.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41168183.
- Also identified by DOI 10.1038/s41467-025-64962-2 and PMC identifier 12575868.
- Licence recorded as CC BY-NC-ND.
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Abstract
For dual-band electrochromic smart windows to achieve widespread adoption, challenges such as slow switching, poor stability, and high power consumption must be addressed. This study introduces a polyviologen|zinc mesh|WO<sub>3</sub> ⋅ 2H<sub>2</sub>O electrochromic energy storage device (EESD) with a PEDOT: PSS layer to enhance conductivity and prevent polyviologen degradation. By utilizing a dual-cathode design, the EESD enables fast switching and operates in four distinct modes-transparent, visible colored, near-infrared colored, and fully colored-allowing adaptive light regulation (320-2500 nm) to optimize energy efficiency across different seasons and times of day. Its self-operating and energy recovery features achieve zero energy consumption while maintaining functionality similar to conventional glass. Simulations indicate that a large-scale deployment across the U.S. can save 66.87 billion MWh, amounting to $7.35 trillion, and reduce CO<sub>2</sub> emissions by 66.94 billion tons. With its rapid switching, long-term durability, and scalability, this device presents significant economic and environmental advantages for real-world applications.