Related Experiment Video
Updated: Jul 11, 2025
Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
Published on: October 5, 2019
Water-Soluble Azobenzene-Based Solar Thermal Fuels with Improved Long-Term Energy Storage and Energy Density.
Haojie Chen1, Chang Yang1, Hao Ren1
1State Key Laboratory of New Textile Materials and Advanced Processing Technology, Hubei Key Laboratory for New Textile Materials and Applications, College of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, China.
Researchers developed water-soluble azobenzene-based solar thermal fuels (WASTFs) using an ionic strategy. These WASTFs offer improved energy storage density and stability, enabling scalable solar energy capture and release without toxic organic solvents.
Area of Science:
- Materials Science
- Renewable Energy Technologies
- Chemical Engineering
Background:
- Azobenzene (azo)-based solar thermal fuels (STFs) are promising for solar energy harvesting and storage.
- Current azo-based STFs suffer from lipophilicity and low energy density, necessitating toxic organic solvents for scalable applications.
Purpose of the Study:
- To develop water-soluble azo-based STFs (WASTFs) with enhanced energy storage performance.
- To overcome the limitations of traditional azo-based STFs regarding solubility and energy density.
Main Methods:
- A facile quaternization reaction using commercial reagents was employed to synthesize WASTFs.
- Characterization of water solubility, thermal half-life, energy storage density, and cation-π interactions.
Main Results:
- A family of WASTFs were successfully synthesized, exhibiting excellent water solubility and long-term thermal stability (>30 days).
- The WASTFs demonstrated high energy storage density (up to ~143.6 J g⁻¹), with energy storage enthalpy up to ~111.8 kJ mol⁻¹.
- Compared to neutral counterparts, WASTFs showed 2.5x higher enthalpy and 7.3x longer thermal half-life, attributed to cation-π interactions.
Conclusions:
- A novel class of water-soluble azo-based solar thermal fuels (WASTFs) has been successfully synthesized.
- WASTFs present significant improvements in energy storage capacity and stability, paving the way for advanced, eco-friendly solar energy storage devices.
