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Coupled Solar Battery with 6.9 % Efficiency.

Lei Jiao1,2, Xiang Zhang1,3, Yangyang Feng1

  • 1CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, Fujian, P. R. China.

Angewandte Chemie (International Ed. in English)
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Summary
This summary is machine-generated.

This study introduces a novel coupled solar battery design using covalent organic frameworks (COFs) for direct solar energy storage. It achieves a breakthrough 6.9% efficiency, paving the way for practical solar-to-electrochemical energy storage systems.

Keywords:
Coupled Solar BatteryCovalent Organic FrameworkPhoto-Intercoupled Electron-Ion TransferPhotoelectrochemical-Storage ElectrodeSolar-to-Electrochemical Energy Storage

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Area of Science:

  • Materials Science
  • Renewable Energy Technologies
  • Electrochemistry

Background:

  • Solar-to-electrochemical energy storage is crucial for solar energy utilization, comparable to solar cells and photocatalytic cells.
  • Coupled solar batteries offer direct solar energy storage but face challenges like low efficiency due to charge recombination and misaligned energy levels.

Purpose of the Study:

  • To propose and demonstrate a novel design for a coupled solar battery.
  • To overcome the limitations of existing coupled solar batteries by improving efficiency and charge management.

Main Methods:

  • Designed a coupled solar battery by intercoupling two photo-coupled ion transfer (PCIT) reactions.
  • Utilized a representative covalent organic framework (COF) for efficient charge separation and directional charge transfer.
  • Employed co-photo-pumping of photoelectrochemical storage cathode and anode.

Main Results:

  • Achieved a breakthrough solar-to-electrochemical energy conversion efficiency of 6.9%.
  • Demonstrated efficient charge separation and directional charge transfer using COFs.
  • The device was successfully scaled to a large area of 56 cm².

Conclusions:

  • The proposed photo-intercoupled electron-ion transfer (PIEIT) mechanism enables efficient direct solar energy storage.
  • The developed COF-based coupled solar battery shows significant potential for practical applications.
  • This work provides a new avenue for advancing solar-to-electrochemical energy storage technologies.