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Thermochromic Hydrogel Smart Window for Iron-Chromium Flow Batteries: Dual Band Modulation and Efficient Energy
Xi Zeng1, Kairan Chen1, RuiChen Zhou1
1State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing, 102249, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 6, 2025
Summary
This novel smart window integrates solar modulation and energy storage. It efficiently manages solar heat gain and stores renewable energy, reducing building energy consumption.
Area of Science:
- Materials Science: Development of advanced hydrogel-based smart windows.
- Electrochemistry: Integration of thermochromic technology with Iron-Chromium Redox Flow Batteries (Fe-Cr RFBs).
- Sustainable Energy: Novel solutions for building-integrated energy storage and solar energy management.
Background:
- Conventional thermochromic windows suffer from slow response times and limited privacy control.
- Integrating energy storage into building envelopes is crucial for managing intermittent renewable energy sources.
- Existing building energy systems often have significant spatial footprints and inefficiencies.
Purpose of the Study:
- To introduce the HydroTherm-Flow Smart Window (HTF Window), a dual-function device for solar modulation and energy storage.
- To overcome limitations of traditional thermochromic systems with ultrafast optical switching and nighttime opacity.
- To enhance energy efficiency and reduce the spatial footprint of energy storage systems in buildings.
Main Methods:
- Integration of tunable hydroxypropyl cellulose (HPC) hydrogels with Fe-Cr RFBs within a single window component.
- Utilizing dual-band (visible and near-infrared) modulation for dynamic solar control.
- Employing molecular dynamics simulations to understand hydrogel-electrolyte interactions and ionic transport.
Main Results:
- Achieved dual functionalities: dynamic solar modulation and high-efficiency (77%) energy storage.
- Demonstrated ultrafast optical switching and autonomous nighttime opacity via HPC hydrogels.
- Reduced solar heat gain coefficient by 40% and enhanced ionic conductivity by 30% through hydrogel 'ion highways'.
Conclusions:
- The HTF Window offers a scalable, long-lasting (20+ years) solution for net-zero buildings.
- It effectively stores surplus renewable energy, balances building-grid demand, and reduces HVAC energy consumption by 25%.
- This innovation bridges sustainable infrastructure with global decarbonization goals by enhancing building energy performance.
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