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Related Concept Videos

Oxygenic Photosynthesis01:26

Oxygenic Photosynthesis

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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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Anoxygenic Photosynthesis01:30

Anoxygenic Photosynthesis

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Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
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The Z-Scheme of Electron Transport in Photosynthesis01:34

The Z-Scheme of Electron Transport in Photosynthesis

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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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Photosystem I01:27

Photosystem I

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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
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Photosystem II01:22

Photosystem II

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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
The pigment molecules are arranged across  two photosystem domains — the antenna complex and the reaction center. The main aim of the pigment...
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Photosystems01:32

Photosystems

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Photosystems are multiprotein complexes that form the functional units of photosynthesis in plants, algae, and cyanobacteria. They are found embedded in the membrane of tiny sac-like structures called thylakoids placed inside the chloroplast.
Functioning of Photosystems
Photosystems contain many pigment molecules, such as chlorophylls and carotenoids, arranged in a particular organization across two domains — the antenna complex and the reaction center. The main aim of the pigment...
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Living Photoanodes for Solar-Driven Water Oxidation.

Rachel M Egan1, Angelo J Victoria1, Jenny Z Zhang1

  • 1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.

Chemical Reviews
|February 23, 2026
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Summary
This summary is machine-generated.

Living photoanodes harness electrons from photosynthetic microorganisms like cyanobacteria for sustainable energy. Advancements in genetic engineering and electrode design are key to unlocking their potential for solar power technologies.

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Microbiology

Background:

  • Photosynthetic microorganisms, particularly cyanobacteria, act as efficient biocatalysts converting solar energy into high-energy electrons.
  • Interfacing these microorganisms with electrodes creates living photoanodes for sustainable electricity generation and chemical production.
  • The field of living photoanodes is rapidly advancing, integrating biology, engineering, and materials science.

Purpose of the Study:

  • To review recent advancements in living photoanode technology.
  • To explore the fundamental biological processes and theoretical potential of these systems.
  • To outline strategies for enhancing photocurrent output and suggest future research directions.

Main Methods:

  • Review of current literature on photosynthetic microorganisms and bio-electrochemical systems.
  • Analysis of theoretical models for estimating maximum photocurrent.
  • Discussion of genetic engineering, electrode design, and mediator strategies.
  • Identification of challenges and opportunities for technological development.

Main Results:

  • Cyanobacteria are key organisms for living photoanodes due to their photosynthetic and electron transport capabilities.
  • Theoretical photocurrent estimations provide benchmarks for technological feasibility.
  • Genetic engineering, optimized electrode interfaces, and mediator systems are crucial for improving performance.
  • Standardized reporting and further research are needed to realize the technology's full potential.

Conclusions:

  • Living photoanodes represent a promising sustainable technology by utilizing natural photosynthetic processes.
  • Significant progress has been made through interdisciplinary research, particularly in understanding cyanobacterial electron transport and optimizing system design.
  • Further development requires standardized methodologies and focused research to overcome current limitations and harness the full potential of this bio-based solar energy conversion approach.