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2018 ; 9
(1
): 1945
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Molecular solar thermal energy storage in photoswitch oligomers increases energy
densities and storage times
#MMPMID29769524
Mansø M
; Petersen AU
; Wang Z
; Erhart P
; Nielsen MB
; Moth-Poulsen K
Nat Commun
2018[May]; 9
(1
): 1945
PMID29769524
show ga
Molecular photoswitches can be used for solar thermal energy storage by
photoisomerization into high-energy, meta-stable isomers; we present a molecular
design strategy leading to photoswitches with high energy densities and long
storage times. High measured energy densities of up to 559?kJ?kg(-1)
(155?Wh?kg(-1)), long storage lifetimes up to 48.5 days, and high quantum yields
of conversion of up to 94% per subunit are demonstrated in
norbornadiene/quadricyclane (NBD/QC) photo-/thermoswitch couples incorporated
into dimeric and trimeric structures. By changing the linker unit between the NBD
units, we can at the same time fine-tune light-harvesting and energy densities of
the dimers and trimers so that they exceed those of their monomeric analogs.
These new oligomers thereby meet several of the criteria to be met for an optimum
molecule to ultimately enter actual devices being able to undergo closed cycles
of solar light-harvesting, energy storage, and heat release.