Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 119, Issue 17, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2120557119
Keywords
radiative cooling; solar thermal; atmospheric window; self-adaptive spectrum; thermochromism
Categories
Funding
- National Science Foundation of China [52130601, 52106276, 51776193, 11574279]
- Youth Innovation Promotion Association, Chinese Academy of Sciences
- Fundamental Research Funds for the Central Universities [108-4115100092]
- research center for multi-energy complementation and conversion
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The sun and outer space are significant renewable thermodynamic resources for human beings. A spectrally self-adaptive absorber/emitter (SSA/E) has been developed to combine the functions of photothermal conversion and radiative cooling, allowing efficient energy harvesting from the sun and rejecting energy to the universe.
The sun (similar to 6,000 K) and outer space (similar to 3 K) are two significant renewable thermodynamic resources for human beings on Earth. The solar thermal conversion by photothermal (PT) and harvesting the coldness of outer space by radiative cooling (RC) have already attracted tremendous interest. However, most of the PT and RC approaches are static and monofunctional, which can only provide heating or cooling respectively under sunlight or darkness. Herein, a spectrally self-adaptive absorber/emitter (SSA/E) with strong solar absorption and switchable emissivity within the atmospheric window (i.e., 8 to 13 mu m) was developed for the dynamic combination of PT and RC, corresponding to continuously efficient energy harvesting from the sun and rejecting energy to the universe. The as-fabricated SSA/E not only can be heated to similar to 170 degrees C above ambient temperature under sunshine but also be cooled to 20 degrees C below ambient temperature, and thermal modeling captures the high energy harvesting efficiency of the SSA/E, enabling new technological capabilities.
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