Journal
ADVANCED SCIENCE
Volume 6, Issue 12, Pages -Publisher
WILEY
DOI: 10.1002/advs.201900367
Keywords
heat release; solar energy storage; solar thermal; solid state materials
Categories
Funding
- Knut and Alice Wallenberg Foundation through project Mastering Morphology for Solution-borne Electronics
- Knut and Alice Wallenberg Foundation through a Wallenberg Fellow grant
- Swedish Strategic Research Foundation
- Australian Research Council [LE0989336]
- Australian Research Council [LE0989336] Funding Source: Australian Research Council
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Devices that can capture and convert sunlight into stored chemical energy are attractive candidates for future energy technologies. A general challenge is to combine efficient solar energy capture with high energy densities and energy storage time into a processable composite for device application. Here, norbornadiene (NBD)-quadricyclane (QC) molecular photoswitches are embedded into polymer matrices, with possible applications in energy storing coatings. The NBD-QC photoswitches that are capable of absorbing sunlight with estimated solar energy storage efficiencies of up to 3.8% combined with attractive energy storage densities of up to 0.48 MJ kg(-1). The combination of donor and acceptor units leads to an improved solar spectrum match with an onset of absorption of up to 529 nm and a lifetime (t(1/2)) of up to 10 months. The NBD-QC systems with properties matched to a daily energy storage cycle are further investigated in the solid state by embedding the molecules into a series of polymer matrices revealing that polystyrene is the preferred choice of matrix. These polymer devices, which can absorb sunlight and over a daily cycle release the energy as heat, are investigated for their cyclability, showing multicycle reusability with limited degradation that might allow them to be applied as window laminates.
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