Photochemical Phase Transitions Enable Coharvesting of Photon Energy and Ambient Heat for Energetic Molecular Solar Thermal Batteries That Upgrade Thermal Energy

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Zhang, Zhao YangShanghai Jiao Tong University (author)

Photochemical Phase Transitions Enable Coharvesting of Photon Energy and Ambient Heat for Energetic Molecular Solar Thermal Batteries That Upgrade Thermal Energy

Article/chapterEnglish2020

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2020-06-17
American Chemical Society (ACS),2020

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LIBRIS-ID:oai:research.chalmers.se:6a681957-1b9d-4930-b99e-3a7350c99e63
https://doi.org/10.1021/jacs.0c03748DOI
https://research.chalmers.se/publication/518440URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype

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Discovering physicochemical principles for simultaneous harvesting of multiform energy from the environment will advance current sustainable energy technologies. Here we explore photochemical phase transitions - a photochemistry-thermophysics coupled regime - for coharvesting of solar and thermal energy. In particular, we show that photon energy and ambient heat can be stored together and released on demand as high-temperature heat, enabled by room-temperature photochemical crystal↔liquid transitions of engineered molecular photoswitches. Integrating the two forms of energy in single-component molecular materials is capable of providing energy capacity beyond that of traditional solar or thermal energy storage systems based solely on molecular photoisomerization or phase change, respectively. Significantly, the ambient heat that is harvested during photochemical melting into liquid of the low-melting-point, metastable isomer can be released as high-temperature heat by recrystallization of the high-melting-point, parent isomer. This reveals that photon energy drives the upgrading of thermal energy in such a hybrid energy system. Rationally designed small-molecule azo switches achieve high gravimetric energy densities of 0.3-0.4 MJ/kg with long-term storage stability. Rechargeable solar thermal battery devices are fabricated, which upon light triggering provide gravimetric power density of about 2.7 kW/kg and temperature increases of >20 °C in ambient environment. We further show their use as deicing coatings. Our work demonstrates a new concept of energy utilization - combining solar energy and low-grade heat into higher-grade heat - which unlocks the possibility of developing sustainable energy systems powered by a combination of natural sunlight and ambient heat.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
TEKNIK OCH TEKNOLOGIER Naturresursteknik Energisystem hsv//swe
ENGINEERING AND TECHNOLOGY Environmental Engineering Energy Systems hsv//eng
TEKNIK OCH TEKNOLOGIER Samhällsbyggnadsteknik Husbyggnad hsv//swe
ENGINEERING AND TECHNOLOGY Civil Engineering Building Technologies hsv//eng

Added entries (persons, corporate bodies, meetings, titles ...)

He, YixinShanghai Jiao Tong University (author)
Wang, Zhihang,1989Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)zhihang (author)
Xu, JialeShanghai Jiao Tong University (author)
Xie, MingchenShanghai Jiao Tong University (author)
Tao, PengShanghai Jiao Tong University (author)
Ji, DeyangTianjin University (author)
Moth-Poulsen, Kasper,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mkasper (author)
Li, TaoShanghai Jiao Tong University (author)
Shanghai Jiao Tong UniversityChalmers tekniska högskola (creator_code:org_t)

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In:Journal of the American Chemical Society: American Chemical Society (ACS)142:28, s. 12256-122641520-51260002-7863

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By the author/editor: Zhang, Zhao Yang; He, Yixin; Wang, Zhihang, 1 ...; Xu, Jiale; Xie, Mingchen; Tao, Peng; show more...; Ji, Deyang; Moth-Poulsen, Ka ...; Li, Tao; show less...

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Environmental En ...; and Energy Systems

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Civil Engineerin ...; and Building Technol ...

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By the university: Chalmers University of Technology

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