Wang Zhihang, Udmark Jonas, Börjesson Karl, Rodrigues Rita, Roffey Anna, Abrahamsson Maria, Nielsen Mogens Brøndsted, Moth-Poulsen Kasper
Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.
Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark.
ChemSusChem. 2017 Aug 10;10(15):3049-3055. doi: 10.1002/cssc.201700679. Epub 2017 Jul 19.
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 CN) ]PF -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.
高效的太阳能储存是迈向可持续未来的一项关键挑战。因此，人们对能够通过价键异构化进行太阳能储存和释放的分子，即所谓的分子太阳能热能储存（MOST）进行了研究。二氢薁/乙烯基七富烯（DHA/VHF）光热对通过光转换进行能量储存的性能已得到评估。该系统的稳定性通过在三种不同溶剂中高温下的多次能量储存和释放循环得以确定。在甲苯等非极性溶剂中，DHA/VHF系统可循环70多次，每次循环的降解率低于0.01%。此外，在流动反应器中证明了[Cu(CH₃CN)₄]PF₆催化VHF转化为DHA。还在原型光转换装置中对DHA/VHF对的性能进行了评估，在实验室中使用流动芯片在模拟阳光下进行评估，在户外条件下使用抛物面镜进行评估。器件实验表明，芯片装置中的太阳能储存效率高达0.13%，抛物面收集器中的太阳能储存效率高达0.02%。文中还讨论了该系统未来改进和优化的途径。
