Design of phase-transition molecular solar thermal energy storage compounds: compact molecules with high energy densities

Qiu, Qianfeng; Gerkman, Mihael A.; Shi, Yuran; Han, Grace G. D.

doi:10.1039/d1cc03742k

Cited by 38 publications

(45 citation statements)

References 31 publications

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“…80 Later on, using a series of further optimized phase-change AZO systems a maximum energy storage density up to 0.3 MJ kg À1 was achieved, showing that the molecular size and polarity can also significantly affect the energy storage capacity. 81 Recently, arylazopyrazole-based photoswitches were reported to undergo efficient PCLT with nearly complete photoconversion ($97%) at room ll OPEN ACCESS temperature. 62 High energy densities of 0.32-0.37 MJ kg À1 were achieved after combining 0.16-0.19 MJ kg À1 of photochemical energy and 0.14-0.21 MJ kg À1 of latent heat stored during E/Z isomerization and crystal melting, respectively.…”

Section: Ll Open Accessmentioning

confidence: 99%

Storing energy with molecular photoisomers

Wang

Erhart

et al. 2021

Joule

129

162

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Section: Ll Open Accessmentioning

confidence: 99%

Storing energy with molecular photoisomers

Wang

Erhart

et al. 2021

Joule

129

162

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“…Furthermore, Xu et al reported a novel photochromic dendrimer obtained by grafting Azo units onto dendrimers, which exhibited excellent solar energy storage, controlled heat release, self-repair and controllable adhesive switching properties [22,23] . Moreover, the research group of Han successfully designed new photoliquefiable Azo molecules featuring photocontrolled latent heat storage [24] . Therefore, Azo photoswitches with PCLT capacities have been investigated as promising energy harvest and storage materials.…”

Section: Introductionmentioning

confidence: 99%

An azobenzene-based photothermal energy storage system for co-harvesting photon energy and low-grade ambient heat via a photoinduced crystal-to-liquid transition

Dong¹,

Zhai²,

Wang³

et al. 2022

Energy Mater

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Ambient heat, slightly above or at room temperature, is a ubiquitous and inexhaustible energy source that has typically been ignored due to difficulties in its utilization. Recent evidence suggests that a class of azobenzene (Azo) photoswitches featuring a reversible photoinduced crystal-to-liquid transition could co-harvest photon energy and ambient heat. Thus, a new horizon has been opened for recovering and regenerating low-grade ambient heat. Here, a series of unilateral para-functionalized photoinduced liquefiable Azo derivatives is presented that can co-harvest and convert photon energy and ambient heat into chemical bond energy and latent heat in molecules and eventually release them in the form of high-temperature utilizable heat. A straightforward crystalline-to-liquid phase transition achieved with ultraviolet light irradiation (365 nm) is enabled by appending a halogen/alkoxy group on the para-position of the Azo photoswitches, and the release of thermal energy is triggered by short-wavelength visible-light irradiation (420 nm). The phase transition properties of the trans- and cis-isomers and the energy density, storage lifetime and heat release performance of the cis-liquid are investigated with differential scanning calorimetry, ultraviolet-visible absorption spectroscopy, and an infrared (IR) thermal camera. The experimental results indicate a high energy density of 335 J/g, a long lifetime of 5 d and a heat release of up to 6.3 °C due to the coupled photochemical-thermophysical mechanism. This work presents a new model for utilizing renewable energy, i.e., the photoinduced conversion of ambient thermal energy.

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“…The isomerization is sometimes accompanied by a solid-liquid transition, 25,26 and the transition energy can be stored by light irradiation. [27][28][29][30] The combination of cold crystallization and photoisomerization is a promising method for nding new functional energy storage systems.…”

Section: Introductionmentioning

confidence: 99%

Cold crystallization and photo-induced thermal behavior of alkyl-derivatized diarylethene molecules

et al. 2022

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Design of phase-transition molecular solar thermal energy storage compounds: compact molecules with high energy densities

Abstract: Compact azobenzene derivatives with various functional groups are investigated to realize total photon and thermal energy storage over 300 J g−1.

Cited by 38 publications

References 31 publications

Storing energy with molecular photoisomers

Storing energy with molecular photoisomers

An azobenzene-based photothermal energy storage system for co-harvesting photon energy and low-grade ambient heat via a photoinduced crystal-to-liquid transition

Cold crystallization and photo-induced thermal behavior of alkyl-derivatized diarylethene molecules

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