Passive, dynamic, programmable thermal regulation toggles between solar heating/ radiative cooling with no sustained power input

https://www.eurekalert.org/news-releases/1088673

"embedded in building’s water loop system, scalable, low-energy... 5-nm platinum metastructure electrode's short voltage pulse enables reversible copper deposition, switching surface’s IR emissivity which remains in chosen state for >30 days... surface raised internal temperatures up to 45.4°C in summer/ cooled by 5°C at night, annual energy savings up to 21.4%, up to 95.8 GJ reductions in cold climates... industrial HVAC, data centers, off-grid greenhouses, smart buildings... durability, bistability, spectral selectivity"

Related: Anisotropic Hygroscopic Hydrogels Enable High-Power, Self-Sustained Passive Daytime Cooling
https://bioengineer.org/anisotropic-hygroscopic-hydrogels-enable-high-power-self-sustained-passive-daytime-cooling/