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Related Concept Videos

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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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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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

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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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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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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
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Improving Na-O2 batteries with redox mediators.

James T Frith1, Imanol Landa-Medrano, Idoia Ruiz de Larramendi

  • 1Department of Chemistry, University of Southampton, SO17 1BJ, Southampton, UK. n.garcia-araez@soton.ac.uk.

Chemical Communications (Cambridge, England)
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Researchers improved sodium-oxygen (Na-O2) cell performance using redox mediators like ethyl viologen. This approach boosts capacity and discharge potential while ensuring stable cycling by suppressing electrode passivation.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Energy Storage

Background:

  • Sodium-oxygen (Na-O2) batteries are promising next-generation energy storage devices.
  • Challenges include electrode passivation and limited cycle life, hindering practical application.
  • Enhancing Na-O2 cell performance is crucial for advancing battery technology.

Purpose of the Study:

  • To demonstrate a novel strategy for improving Na-O2 cell performance.
  • To investigate the role of redox mediators in facilitating the discharge process.
  • To achieve enhanced capacity, potential, and cycling stability.

Main Methods:

  • Utilizing redox mediators, specifically ethyl viologen, in Na-O2 cells.
  • Analyzing the electrochemical reactions during the discharge process.
  • Evaluating cell capacity, discharge potential, and cycling stability.

Main Results:

  • Redox mediators effectively facilitate the Na-O2 discharge reaction.
  • Electrode passivation is suppressed, leading to increased cell capacity.
  • Faster kinetics result in a higher discharge potential.
  • Stable cycling performance is achieved with the addition of redox mediators.

Conclusions:

  • Redox mediators offer a viable route to significantly enhance Na-O2 cell performance.
  • The suppression of electrode passivation is key to achieving higher capacities.
  • This approach holds potential for developing more efficient and durable sodium-oxygen batteries.