Evaluating Dihydroazulene/Vinylheptafulvene Photoswitches for Solar Energy Storage Applications
Artikel i vetenskaplig tidskrift, 2017

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 photo-conversion 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)CN4] P-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.

solvent effects

flow systems



energy conversion


Zhihang Wang

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

J. Udmark

Kobenhavns Universitet

Karl Börjesson

Göteborgs universitet

Rita Rodrigues

Kemi och kemiteknik, Kemi och biokemi, Fysikalisk kemi

Anna Roffey

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Maria Abrahamsson

Kemi och kemiteknik, Kemi och biokemi, Fysikalisk kemi

M. B. Nielsen

Kobenhavns Universitet

Kasper Moth-Poulsen

Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi


1864-5631 (ISSN) 1864-564X (eISSN)

Vol. 10 3049-3055


Fysikalisk kemi