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2017 ; 10
(15
): 3049-3055
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Evaluating Dihydroazulene/Vinylheptafulvene Photoswitches for Solar Energy
Storage Applications
#MMPMID28644559
Wang Z
; Udmark J
; Börjesson K
; Rodrigues R
; Roffey A
; Abrahamsson M
; Nielsen MB
; Moth-Poulsen K
ChemSusChem
2017[Aug]; 10
(15
): 3049-3055
PMID28644559
show ga
Efficient solar energy storage is a key challenge in striving toward a
sustainable future. For this reason, molecules capable of solar energy storage
and release through valence isomerization, for so-called molecular solar thermal
energy storage (MOST), have been investigated. Energy storage by photoconversion
of the dihydroazulene/vinylheptafulvene (DHA/VHF) photothermal couple has been
evaluated. The robust nature of this system is determined through multiple energy
storage and release cycles at elevated temperatures in three different solvents.
In a nonpolar solvent such as toluene, the DHA/VHF system can be cycled more than
70?times with less than 0.01?% degradation per cycle. Moreover, the [Cu(CH(3)
CN)(4) ]PF(6) -catalyzed conversion of VHF into DHA was demonstrated in a flow
reactor. The performance of the DHA/VHF couple was also evaluated in prototype
photoconversion devices, both in the laboratory by using a flow chip under
simulated sunlight and under outdoor conditions by using a parabolic mirror.
Device experiments demonstrated a solar energy storage efficiency of up to 0.13?%
in the chip device and up to 0.02?% in the parabolic collector. Avenues for
future improvements and optimization of the system are also discussed.