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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Light-driven water oxidation for solar fuels.

Karin J Young1, Lauren A Martini1, Rebecca L Milot1

  • 1Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT 06520-8107, USA.

Coordination Chemistry Reviews
|November 4, 2014
PubMed
Summary
This summary is machine-generated.

Researchers are advancing light-driven water oxidation for converting sunlight into chemical fuels. This review focuses on photoanodes for solar water splitting, inspired by dye-sensitized solar cells.

Keywords:
Artificial photosynthesisSolar fuelsWater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Photochemistry

Background:

  • The Fujishima-Honda breakthrough in 1972 demonstrated photoelectrochemical water oxidation using TiO2.
  • Current research functionalizes semiconductor surfaces with molecular adsorbates for visible light absorption and catalysis.
  • Efficient solar water splitting requires harnessing multiple photochemical events for multielectron reactions.

Purpose of the Study:

  • To review recent progress in light-driven water oxidation.
  • To emphasize water-oxidation photoanodes inspired by dye-sensitized solar cell designs.
  • To address challenges in developing efficient photocatalytic cells for solar water splitting.

Main Methods:

  • Review of experimental and computational studies on water oxidation.
  • Focus on functionalized thin film semiconductors.
  • Analysis of molecular adsorbates, chromophores, and catalysts.

Main Results:

  • Significant advances in individual components for water oxidation.
  • Development of dye-sensitized solar cells and photocatalytic cells.
  • Ongoing challenges in achieving highly efficient solar water splitting.

Conclusions:

  • Functionalized photoanodes are key for efficient solar water splitting.
  • Inspiration from dye-sensitized solar cell designs offers promising pathways.
  • Further research is needed to overcome limitations in photocatalytic cell efficiency.