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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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The electron transport chain or oxidative phosphorylation is an exothermic process in which free energy released during electron transfer reactions is coupled to ATP synthesis. This process is a significant source of energy in aerobic cells, and therefore inhibitors of the electron transport chain can be detrimental to the cell's metabolic processes.
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Electron Transport Chain: Complex I and II01:46

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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Extraction: Advanced Methods00:56

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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The Supercomplexes in the Crista Membrane01:41

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The mitochondrial cristae membrane is the primary site for the oxidative phosphorylation (OXPHOS) process of energy conversion mediated through respiratory complexes I to V. These complexes have been widely studied for decades, and it has been proven that they form supramolecular structures called respiratory supercomplexes (SC). These higher-order complexes may be crucial in maintaining the biochemical structure and improving the physiological activity of the individual complexes while...
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Leveraging Electrons for Electrochemical CO2 Capture Using a Hemi-Labile Iron Complex.

Hyowon Seo1,2, Ying Chen3, Eric Walter4

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA.

Angewandte Chemie (International Ed. in English)
|August 4, 2025
PubMed
Summary
This summary is machine-generated.

Scientists developed a novel electron-leveraging strategy for electrochemical carbon capture, exceeding the theoretical limit for electron utilization. This breakthrough enhances energy efficiency in capturing carbon dioxide (CO2), crucial for combating climate change.

Keywords:
Carbon storageElectrochemistryIronLigand effectsRedox chemistry

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Engineering

Background:

  • Anthropogenic carbon emissions are driving climate change, necessitating urgent deployment of energy-efficient carbon capture technologies.
  • Electrochemical carbon capture methods are promising but often limited by electron utilization efficiency, theoretically capped at one CO2 molecule per electron.
  • Current CO2 levels (427 ppm) highlight the critical need for advanced capture solutions to avert climate tipping points.

Purpose of the Study:

  • To introduce and validate an electron-leveraging strategy to surpass the theoretical limit of electron utilization in electrochemical carbon capture.
  • To enhance the energy efficiency and practicality of electrochemical CO2 separation processes.
  • To develop a robust and reversible electrochemical system for carbon capture applications.

Main Methods:

  • Employed a redox-active coordination complex, Fe-EDDHA, with a ligand featuring multiple hemi-labile coordination sites.
  • Introduced nicotinamide to protect the iron(II) center, preventing undesired CO2 reduction and ensuring system reversibility.
  • Tested the cyclic system's performance using simulated flue gas (15% CO2) to determine operational energy and electron utilization.

Main Results:

  • Achieved an enhanced electron utilization of 1.43 CO2 molecules per electron, exceeding the previous theoretical limit of one.
  • Demonstrated a minimum operational energy of 22.6 kJ/mol and an average of 63.7 kJ/mol over 29 cycles.
  • Confirmed the system's robustness and reversibility through cyclic operation.

Conclusions:

  • The developed electron-leveraging strategy significantly improves electron utilization efficiency in electrochemical carbon capture.
  • This approach offers a promising pathway toward more energy-efficient and effective carbon capture technologies.
  • The strategy provides an alternative to existing methods for managing electron transfer reactions in redox-active materials.