Abstract
Photoswitchable compounds are promising materials for solar-thermal energy conversion and storage. In particular, photoresponsive azobenzene-containing compounds are proposed as materials for solar-thermal fuels. In this feature article, solar-thermal fuels based on azobenzene-containing polymers (azopolymers) are reviewed. The mechanism of azopolymer-based solar-thermal fuels is introduced, and computer simulations and experimental results on azopolymer-based solar-thermal fuels are highlighted. Different types of azopolymers such as linear azopolymers, 2D azopolymers, and conjugated azopolymers are addressed. The advantages and limitations of these azopolymers for solar-thermal energy conversion and storage, along with the remaining challenges of azopolymer-based solar-thermal fuels, are discussed.
Highlights
They suggested keeping the storage tank of azobenzene solu tions in a dark, cool room because cis azobenzene is apt to conSolar energy is one of the most important renewable energies. vert into trans form at high temperatures
Solar-thermal fuels based on azobenzene-functional ized carbon nanotubes (CNTs), graphenes, and conjugated polymers have increased energy density and good recyclability, Zhitomirsky et al real ized the limitations of those materials:[32] carbon scaffolds increased synthesis complexity, cannot be deposited into uni form films, contribute to the optical density without resulting in photocharging, introduce uncontrollable morphological effects that may limit charging, and hinder photoisomerization in the
We summarized the development of solar-thermal fuels based on azopolymers such as azobenzene-functionalized 2D poly mers, conjugated polymers, and linear polymers
Summary
They suggested keeping the storage tank of azobenzene solu tions in a dark, cool room because cis azobenzene is apt to con. The development of solar-thermal fuels using conversion and storage. Because solar-thermal energy conversion and storage undeveloped for a the energy level of cis azobenzene is ≈50 kJ mol−1 (275 kJ kg−1) long time. Based on the new developments of organic chemhigher than that of the trans isomer (Figure 1b),[11] solar energy istry, materials chemistry, polymer chemistry, photochemistry, is stored in the metastable cis isomer. Cis group restarted developing solar-thermal fuels using azobenzene-containing materials. After obtaining his Ph.D. in 2010, he worked as a postdoctoral fellow at MPIP and was promoted to a group leader in 2012. We will show how to design azopolymers to overcome some obstacles for solar-thermal conversion and storage
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