Daytime passive radiative cooling is a promising electricity-free pathway for cooling terrestrial buildings. Current research interest in this cooling strategy mainly lies in tailoring the optical spectra of materials for strong thermal emission and high solar reflection. However, environmental heat gain poses a crucial challenge to building cooling at subambient temperatures. Herein, we devise a scalable thermal insulating cooler (TIC) consisting of hierarchically hollow microfibers as the building envelope that simultaneously achieves passive daytime radiative cooling and thermal insulation to reduce environmental heat gain. The TIC demonstrates efficient solar reflection (94%) and long-wave infrared emission (94%), yielding a temperature drop of about 9 °C under sunlight of 900 W/m2. Notably, the thermal conductivity of the TIC is lower than that of air, thus preventing heat flow from external environments to indoor space in the summer, an additional benefit that does not sacrifice the radiative cooling performance. A building energy simulation shows that 48.5% of cooling energy could be saved if the TIC is widely deployed in China.

Hierarchically Hollow Microfibers as a Scalable and Effective Thermal Insulating Cooler for Buildings.

Toward Stable and Efficient Perovskite Light-Emitting Diodes

A passive cooling strategy without any electricity input has shown a significant impact on overall energy consumption globally. However, designing tunable daytime radiative cooler to meet requirement of different weather conditions is still a big challenge, especially in hot, humid regions. Here, a novel type of tunable, thermally insulating and compressible cellulose nanocrystal (CNC) aerogel coolers is prepared via chemical cross-linking and unidirectional freeze casting process. Such aerogel coolers can achieve a subambient temperature drop of 9.2 °C under direct sunlight and promisingly reached the reduction of ∼7.4 °C even in hot, moist, and fickle extreme surroundings. The tunable cooling performance can be realized via controlling the compression ratio of shape-malleable aerogel coolers. Furthermore, energy consumption modeling of using such aerogel coolers in buildings in China shows 35.4% reduction of cooling energy. This work can pave the way toward designing high-performance, thermal-regulating materials for energy consumption savings.

Dynamically Tunable All-Weather Daytime Cellulose Aerogel Radiative Supercooler for Energy-Saving Building.

With the aggravation of global warming and extreme weather, cooling demand has witnessed a continuous increase and is expected to increase tenfold by 2050. Radiative sky cooling (RSC) without any pollution and energy consumption has drawn worldwide attention in the past few years. Large‐scale and scalable porous cooling materials have greatly advanced the progress of this technology. Herein, a critical review on porous cooling materials with the goal of advancing their commercial applications is presented. The detailed design principles of daytime radiative cooling are first discussed to clarify the critical factors of porous structures for great cooling performance. What follows are detailed discussions on porous cooling materials from pore‐forming methods. Subsequently, the recent progress of the promising particle‐embedding porous structures, mainly including white and colorful coolers for various applications, is outlined. Additionally, some special cooling materials are highlighted to further broaden the applications of RSC technology. Last but not the least, the remaining open challenges and the insights are presented for the further advance of the commercialization progress.

Micro‐Nano Porous Structure for Efficient Daytime Radiative Sky Cooling

Passive daytime radiative cooling: Fundamentals, material designs, and applications

Perovskite Single Crystals: Synthesis, Optoelectronic Properties, and Application

Radiative cooling, a passive cooling technique, has shown great potentials in recent years to lower the power consumption of air conditioning. With the ever-increasing cooling power being reported,...

Plasmon-Enhanced Infrared Emission Approaching the Theoretical Limit of Radiative Cooling Ability

A membrane reflector, polymer hybrid infrared emitter for better radiative cooling performance

Although research progress on mimicking natural photosynthesis for solar-to-fuel conversion has been continuously made, exploring broadband spectral-responsive materials with suitable band position...

P-Type AsP Nanosheet as an Electron Donor for Stable Solar Broad-Spectrum Hydrogen Evolution.

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Perovskite Single Crystals: Synthesis, Optoelectronic Properties, and Application

Plasmon-Enhanced Infrared Emission Approaching the Theoretical Limit of Radiative Cooling Ability

A membrane reflector, polymer hybrid infrared emitter for better radiative cooling performance

P-Type AsP Nanosheet as an Electron Donor for Stable Solar Broad-Spectrum Hydrogen Evolution.