Azobenzene-Based Solar Thermal Fuels: A Review

Area of Science:

• Molecular switches and energy storage systems.
• Photochemistry and materials science.

Background:

• Azobenzene and other molecular systems store energy through structural transformations like cis-trans isomerization.
• These "molecular batteries" convert light energy into stored chemical energy, releasing it upon stimulation.
• Key performance metrics include stored energy, energy density, half-life, and solar energy conversion efficiency.

Purpose of the Study:

• To provide a comprehensive review of advancements in azobenzene molecular photoswitch systems for solar thermal fuels (STFs).
• To highlight the performance of azobenzene derivatives and carbon nano-templates in STFs.
• To discuss challenges and propose solutions for improving STF performance.

Main Methods:

• Review of recent literature on azobenzene-based solar thermal fuels.
• Analysis of energy storage mechanisms, including isomerization and structural changes.
• Summarization of methods for controllable energy release and potential solutions for cycling stability.

Main Results:

• Azobenzene-based STFs demonstrate energy storage capabilities comparable to commercial lithium batteries.
• Current systems utilize ultraviolet light for charging and exhibit controllable energy release mechanisms.
• Potential relationships between mechanical and thermal energy release in azobenzene STFs are identified.

Conclusions:

• Azobenzene molecular photoswitch systems show significant promise for STF applications.
• Further investigation into cycling stability and controlled energy release is crucial for practical implementation.
• Exploring the interplay between mechanical and thermal energy release could unlock new research avenues.