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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Related Experiment Video

Updated: Mar 18, 2026

Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
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In Situ PrOx Framework Enables Reversible Reaction Pathways in Li-O2 Batteries.

Yuming Shu1,2, Hanghang Lei2, Qing Pan1

  • 1College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.

The Journal of Physical Chemistry Letters
|March 16, 2026
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Researchers improved lithium-oxygen (Li-O2) battery reversibility using a novel electrolyte additive. This additive creates a PrOx framework, enabling smaller Li2O2 particles and enhancing cycling stability for better battery performance.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Lithium-oxygen (Li-O2) batteries offer high theoretical energy density but face challenges with practical reversibility.
  • The insulating nature of the Li2O2 discharge product hinders reaction kinetics and promotes electrolyte decomposition.
  • Existing cathodes struggle with efficient Li2O2 formation and decomposition, limiting battery lifespan.

Purpose of the Study:

  • To enhance the reversibility and cycling stability of Li-O2 batteries.
  • To mitigate the negative effects of the insulating Li2O2 discharge product.
  • To develop a novel cathode modification strategy for improved O2 redox reactions.

Main Methods:

  • Introduction of Pr(NO3)3 as an electrolyte additive during the initial discharge.
  • In situ generation of an amorphous, three-dimensional PrOx framework on a Co3O4/CNT cathode.
  • Electrochemical characterization to evaluate reaction kinetics, voltage gap, and cycling stability.

Main Results:

  • The PrOx framework effectively confines Li2O2 growth, producing nanosized, poorly ordered Li2O2.
  • A significant decrease in the voltage gap from 1.66 V to 1.16 V at 200 μA cm-2 was observed.
  • Suppression of Li2CO3 byproduct formation led to markedly improved cycling stability.

Conclusions:

  • The in situ generated PrOx framework acts as a beneficial catalyst and structural director for Li-O2 batteries.
  • This approach effectively addresses the limitations imposed by the insulating Li2O2 discharge product.
  • The strategy offers a promising pathway for developing more practical and stable Li-O2 energy storage systems.