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Electron Transport Chain Components01:29

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The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
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Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
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Proton transport under external applied voltage.

Zhen Cao1, Revati Kumar, Yuxing Peng

  • 1Department of Chemistry, James Frank Institute, Computation Institute, The University of Chicago , 5735 South Ellis Avenue, Chicago, Illinois 60637, United States.

The Journal of Physical Chemistry. B
|April 12, 2014
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Summary
This summary is machine-generated.

Proton transport in electrolytes is enhanced by Grotthuss hopping over vehicular mechanisms at higher voltages. Applied voltage alters proton diffusion dynamics, differing from bulk water behavior.

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Area of Science:

  • Physical Chemistry
  • Computational Materials Science
  • Electrochemistry

Background:

  • Proton transport is crucial for electrochemical devices like fuel cells.
  • Understanding proton dynamics in electrolytes under external fields is essential.
  • Existing models often simplify the interplay between different proton transport mechanisms.

Purpose of the Study:

  • To investigate proton transport mechanisms in an electrolyte between platinum electrodes.
  • To analyze the correlation between vehicular and Grotthuss hopping under varying applied voltages.
  • To determine how external voltage influences proton diffusion constants.

Main Methods:

  • Reactive molecular dynamics simulations were employed.
  • Proton transport was analyzed by decomposing it into vehicular and Grotthuss hopping.
  • Simulations were conducted across a range of applied voltages.

Main Results:

  • The Grotthuss hopping mechanism significantly impacts proton transport at higher applied voltages.
  • The correlation between vehicular and Grotthuss mechanisms shifts from negative to positive with increasing voltage.
  • Hopping frequency, consecutive forward hops, and the total diffusion constant increase at higher voltages.

Conclusions:

  • Applied voltage fundamentally alters hydrated excess proton behavior compared to bulk water.
  • The Grotthuss mechanism becomes dominant under higher electric fields.
  • This study provides insights into voltage-dependent proton transport for advanced material design.