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Related Concept Videos

Redox Equilibria: Overview01:23

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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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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Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
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Redox titration is a chemical analysis technique used to determine the concentration of an unknown substance by measuring the electron transfer in a redox (reduction-oxidation) reaction. The process involves gradually adding a titrant with a known concentration of an oxidizing or reducing agent, to the analyte, the solution with an unknown concentration, until reaching the endpoint, which indicates the completion of the reaction between the two substances. Ensuring the analyte is in a single...
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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
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Visualizing atomic-scale redox dynamics in vanadium oxide-based catalysts.

Martin Ek1, Quentin M Ramasse2, Logi Arnarson1

  • 1Haldor Topsøe A/S, Haldor Topsøes Allé 1, 2800 Kgs, Lyngby, Denmark.

Nature Communications
|August 22, 2017
PubMed
Summary
This summary is machine-generated.

Metal oxide surface redox reactions, crucial for catalysis, were studied using high-resolution microscopy. Vanadium oxide on titanium dioxide reversibly transforms between ordered and disordered states with changing oxidation conditions.

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Area of Science:

  • Surface science
  • Catalysis
  • Materials science

Background:

  • Surface redox processes involving oxygen atom exchange are fundamental in metal oxide catalysis.
  • These processes are challenging to study due to surface stoichiometry and atomic arrangement changes.

Purpose of the Study:

  • To investigate the dynamic surface transformations of supported vanadium oxide under varying redox conditions.
  • To understand the influence of the supporting titanium dioxide on vanadium oxide surface behavior.

Main Methods:

  • Utilized high-resolution transmission electron microscopy (HRTEM) for atomic-resolution imaging.
  • Studied vanadium oxide supported on titanium dioxide catalysts.

Main Results:

  • Observed a reversible transformation between ordered and disordered vanadium oxide surface states.
  • Correlated these surface changes with reversible shifts in vanadium oxidation states under oxidizing and reducing conditions.
  • Demonstrated that the transformation is dependent on the titanium dioxide surface termination and vanadium oxide layer thickness.

Conclusions:

  • The properties of supported vanadium oxide are sensitive to the underlying titanium dioxide support.
  • These findings provide a basis for understanding structure-sensitive catalytic properties in related systems.
  • Highlights the dynamic nature of metal oxide surfaces in catalytic applications.