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Related Concept Videos

Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

Oxidation–Reduction Reactions
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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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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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For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
Redox Reactions01:24

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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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Related Experiment Video

Updated: Jul 8, 2026

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
09:02

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

Published on: April 27, 2018

Highly efficient electrocatalysts for oxygen reduction reaction.

Haizhou Zhang1, Weishen Yang

  • 1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.

Chemical Communications (Cambridge, England)
|January 26, 2008
PubMed
Summary
This summary is machine-generated.

New LnxSr1-xCoO3-delta/Co3O4 electrocatalysts show high efficiency for oxygen reduction reactions. These materials are promising for intermediate-temperature solid oxide fuel cells (SOFCs) and oxygen separation membranes.

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Last Updated: Jul 8, 2026

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09:02

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12:12

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Developing efficient electrocatalysts is crucial for advancing energy conversion technologies.
  • Oxygen reduction reaction (ORR) is a key process in fuel cells and oxygen separation.

Purpose of the Study:

  • To present highly efficient and chemically compatible LnxSr1-xCoO3-delta/Co3O4 electrocatalysts.
  • To evaluate their potential for intermediate-temperature solid oxide fuel cells (SOFCs) and oxygen separation membranes.

Main Methods:

  • Synthesis and characterization of LnxSr1-xCoO3-delta/Co3O4 electrocatalysts.
  • Electrochemical testing for oxygen reduction reaction (ORR) performance.
  • Analysis of cathode polarization resistances.

Main Results:

  • The LnxSr1-xCoO3-delta/Co3O4 electrocatalysts demonstrated high efficiency for the ORR.
  • Very low cathode polarization resistances were achieved.
  • Excellent electrochemical performances were observed.

Conclusions:

  • The developed electrocatalysts show significant promise for intermediate-temperature solid oxide fuel cells (SOFCs).
  • These materials also hold potential for applications in oxygen separation membranes.