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Photoreceptors and Visual Pathways01:22

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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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  11. A Tetra-ortho-chlorinated Azobenzene Molecule For Visible-light Photon Energy Conversion And Storage.
  1. Home
  3. Research Domains
  5. Engineering
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  9. Electrochemical Energy Storage And Conversion
  11. A Tetra-ortho-chlorinated Azobenzene Molecule For Visible-light Photon Energy Conversion And Storage.

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A tetra-ortho-Chlorinated Azobenzene Molecule for Visible-Light Photon Energy Conversion and Storage.

Shuxin Tang1, Yating Zhang1,2, Jun Xia1

  • 1Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province, Interdisciplinary Research Academy, Zhejiang Shuren University, Hangzhou 310021, China.

Molecules (Basel, Switzerland)
|June 13, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

Researchers developed a novel tetra-ortho-chlorinated azobenzene molecule for efficient visible-light photothermal energy storage. This photoswitchable molecule offers long-term storage and stability, overcoming limitations of UV-dependent systems.

Keywords:
azobenzenephotoinduced phase transitionphotothermalvisible-light energy storage

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Photochemistry

Background:

  • Photoactive molecules are crucial for solar energy utilization and photothermal energy storage.
  • Azobenzene photoswitches show promise for solar energy conversion but often require UV light for energy storage, limiting practical applications.
  • Existing azobenzene systems face challenges with visible-light absorption and efficient energy storage.

Purpose of the Study:

  • To design and synthesize a novel azobenzene photothermal molecule capable of storing visible-light photon energy.
  • To investigate the photoisomerization, energy storage capacity, and stability of the synthesized molecule under visible light irradiation.
  • To explore the potential applications of this molecule in solar energy storage technologies.

Main Methods:

  • Synthesis of a tetra-ortho-chlorinated azobenzene derivative with an alkyl chain.
  • Characterization using ultraviolet-visible spectroscopy and proton nuclear magnetic resonance (¹H NMR).
  • Determination of energy storage density via differential scanning calorimetry (DSC) and density functional theory (DFT) calculations.
  • Assessment of long-term energy storage stability and cyclic performance.

Main Results:

  • The synthesized tetra-ortho-chlorinated azobenzene effectively absorbs and stores energy under 550 nm visible light irradiation.
  • Stored energy can be released upon irradiation with 430 nm light.
  • Experimental (13.50 kJ/mol) and theoretical (28.21 kJ/mol) energy storage densities were determined, with a discrepancy attributed to Z-isomer yield.
  • The molecule demonstrated long-term energy storage (11-day half-life) and excellent cyclic stability (100 cycles).
  • The E-isomer exhibited significant supercooling properties.

Conclusions:

  • A novel azobenzene photothermal molecule capable of efficient visible-light energy storage has been successfully developed.
  • The synthesized molecule exhibits promising long-term stability, cyclic durability, and potential for low-temperature applications due to supercooling.
  • This advancement addresses key limitations in current azobenzene-based solar energy storage systems.