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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
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A molecular tandem cell for efficient solar water splitting.

Degao Wang1,2,3, Jun Hu3, Benjamin D Sherman4

  • 1Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Industrial Technology, Chinese Academy of Sciences, 315201 Ningbo, Zhejiang, China; degao@live.unc.edu wyou@unc.edu tjmeyer@unc.edu.

Proceedings of the National Academy of Sciences of the United States of America
|June 3, 2020
PubMed
Summary

Researchers developed a novel artificial photosynthesis system for efficient solar energy storage. This device achieves water splitting without external power, mimicking natural photosynthesis for sustainable hydrogen and oxygen production.

Keywords:
bias-freemolecular tandem cellorganic cellsolar fuelswater splitting

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Area of Science:

  • Renewable Energy
  • Photochemistry
  • Materials Science

Background:

  • Artificial photosynthesis aims to store solar energy in chemical bonds.
  • Efficient water splitting is crucial for artificial photosynthetic devices.
  • Current methods often require external potential bias.

Purpose of the Study:

  • To design a tandem photoelectrochemical cell for bias-free water splitting.
  • To mimic the tandem cell configuration of Photosystem II (PSII) in natural photosynthesis.
  • To achieve efficient solar energy conversion and storage.

Main Methods:

  • Combining a dye-sensitized photoelectrosynthesis cell (DSPEC) and an organic solar cell (OSC) in a photoanode for water oxidation.
  • Integrating the photoanode with a platinum (Pt) electrode for hydrogen (H2) evolution.
  • Constructing a combined electrochemical cell for water splitting (2H2O → O2 + 2H2).

Main Results:

  • Achieved 1.5% solar conversion efficiency for water splitting without external applied bias.
  • Demonstrated sustained water splitting with photocurrent densities of 1.24 mA/cm2 for 1 hour under 1-sun illumination.
  • Successfully mimicked the tandem cell configuration of PSII.

Conclusions:

  • The developed tandem photoelectrochemical cell enables efficient, bias-free water splitting.
  • This technology offers a promising pathway for artificial photosynthesis and solar energy storage.
  • The system provides a stable and efficient method for producing hydrogen and oxygen from water using solar energy.