Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

Wu, Silong; Cao, Yanfei; Li, Yaqi; Sun, Wei

doi:10.1002/adom.202202163

Cited by 39 publications

(14 citation statements)

References 263 publications

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“…To achieve the desired RSC function, the simple and direct monolayer coating structure is adopted in this study to screen suitable materials, instead of the popular designs of double-layer and embedded particles, which are the commonly used structures for RSC enhancement. [33] Meanwhile, minimizing the changes to the original design of the PV module can reduce introducing uncertain factors that might affecting the PV performance. This strategy is also conducive to the further study of coating application on the existing PV.…”

Section: Results Of Rscm Selectionmentioning

confidence: 99%

Bioinspired Antireflection Double‐Layer Coatings Design Method and Light Management to Realize Radiative Sky Cooling in Photovoltaic Module

Lyu

Gao

et al. 2023

Energy Tech

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Recent research on combining photovoltaic (PV) modules with radiative sky cooling (RSC) technology has elicited much interest. Such cross‐disciplinary technology coupling provides a feasible approach to solar cells’ nighttime applications. However, current commonly used radiative sky cooling materials’ (RSCMs) conflict with the solar light harvesting and utilizing of PV module. The spectral selectivity characteristics of the strong transmission in the solar spectrum range (0.3–1.1 μm) and the enough emissivity within the atmosphere transparency window (8–13 μm) are the essential to develop the PV module‐usable RSC coating. Herein, antireflection (AR) structure optimize method and RSC coating design method are proposed to achieve nighttime RSC capacity with high solar radiation transmission property via the RSCM selection and light management, in the visible, near‐infrared, and midinfrared wavelength range, originating from the subwavelength optical effects of bioinspired AR design. A kind of double‐layer coating consisting of the PDMS substrate layer and SiO2 close‐packed hexagonal rotating parabolic body‐bioinspired moth‐eye structure cover layer is designed in this research. The coating has 0.997 average transmissivity characteristic in solar spectrum and can lower the PV cell temperature over 10.5 K than ambient at night.

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Section: Results Of Rscm Selectionmentioning

confidence: 99%

Bioinspired Antireflection Double‐Layer Coatings Design Method and Light Management to Realize Radiative Sky Cooling in Photovoltaic Module

Lyu

Gao

et al. 2023

Energy Tech

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“…[ 30 ] Nevertheless, these advanced radiative cooling materials are confronted with at least one of the following restraints: (1) expensive and time‐consuming processes; (2) limitation in scalable fabrication; (3) inadequate optical modulation ability; (4) requirement of additional energy cost. [ 7,31‐32 ]…”

Section: Background and Originality Contentmentioning

confidence: 99%

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management^†

et al. 2023

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Comprehensive SummaryAdvanced radiative cooling materials with both heating and cooling mode is of pivotal importance for all‐season energy‐saving in buildings. In this work, we report the design and fabrication of bacterial cellulose‐based Janus films (J‐BC) with radiative cooling and solar heating properties, which were developed by two‐step vacuum‐assisted filtration of modified MXene‐doped bacterial cellulose and modified silicon nitride (Si3N4)‐doped bacterial cellulose, followed by hot‐pressing and drying treatments. The as‐prepared J‐BC films show a unique Janus structure where modified MXene nanosheets and cellulose nanofibers are on the bottom surface, and modified silicon nitride (Si3N4) nanoparticles and cellulose nanofibers are on the top surface. The radiative cooling effect of J‐BC films is enabled by the Si3N4‐doped bacterial cellulose due to the high mid‐infrared emissivity of Si3N4 nanoparticles, which shows a high solar reflection of ~98.1% and high emissivity of ~93.6% in the atmospheric transparency window (8—13 μm). Thanks to the enhanced photothermal conversion of the modified MXene nanosheets, a reduced solar reflection (6.6%) and relatively low thermal emissivity in the atmospheric window (71.4%) are achieved, making sure the solar heating effect of J‐BC films. In the outdoor tests, J‐BC films achieve a sub‐ambient temperature drop of ~3.8 °C and an above‐ambient temperature rise of ~14.2 °C. Numerical prediction demonstrated that the J‐BC films with dual modes have great potential of all‐season energy saving for buildings and a corresponding energy‐saving map in China is also created. The work disclosed herein can provide an avenue for the shaping of advanced radiative cooling materials for emerging applications of personal thermal management, sustainable energy‐efficient buildings, and beyond.

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“…This requirement demands precise control over a material's optical characteristics across an extensive range of wavelengths spanning nearly two orders of magnitude. [10,11] In recent years, researchers have made significant progress in the field of radiative cooling by leveraging advancements in photonic structures. The designed photonic structures are capable of reflecting incident photons to minimize heat gain while emitting infrared photons toward the cold universe.…”

Section: Introductionmentioning

confidence: 99%

Flexible Photonic Radiative Cooling Films: Fundamentals, Fabrication and Applications

Xie

Xiao

Sun

et al. 2023

Adv Funct Materials

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Photonic structures designed at sub‐wavelength scales have emerged as a promising avenue for various energy applications, including cooling devices, water harvesting, photovoltaics, and personal thermal management, which have significantly transformed the global energy landscape. Particularly, flexible photonic radiative cooling films, which facilitate heat dissipation from surfaces by emitting it into outer space via infrared radiation, have achieved great progress in recent years. In this review, the different approaches used to design photonic structures for manipulating solar reflectance and optimizing thermal emittance are summarized. On this basis, this review discusses advancements in flexible radiative cooling films that have been meticulously adhere to these design principles, alongside their cooling effects over recent years. Furthermore, a comprehensive overview of the progress is presented in the photonic integration with new functionality and the fabrication techniques of photonic structures. Lastly, this review highlights the remarkable potential of radiative coolers in various fields. In prospect, the widespread adoption of flexible photonic radiative cooling films holds immense promise for diverse applications.

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Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

Cited by 39 publications

References 263 publications

Bioinspired Antireflection Double‐Layer Coatings Design Method and Light Management to Realize Radiative Sky Cooling in Photovoltaic Module

Bioinspired Antireflection Double‐Layer Coatings Design Method and Light Management to Realize Radiative Sky Cooling in Photovoltaic Module

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management^†

Flexible Photonic Radiative Cooling Films: Fundamentals, Fabrication and Applications

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Recent Advances in Material Engineering and Applications for Passive Daytime Radiative Cooling

Cited by 39 publications

References 263 publications

Bioinspired Antireflection Double‐Layer Coatings Design Method and Light Management to Realize Radiative Sky Cooling in Photovoltaic Module

Bioinspired Antireflection Double‐Layer Coatings Design Method and Light Management to Realize Radiative Sky Cooling in Photovoltaic Module

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management†

Flexible Photonic Radiative Cooling Films: Fundamentals, Fabrication and Applications

Contact Info

Product

Resources

About

Bacterial Cellulose‐Based Janus Films with Radiative Cooling and Solar Heating Properties for All‐Season Thermal Management^†