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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 Reactions01:27

Redox Reactions

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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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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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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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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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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.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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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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Balancing Redox Equations02:58

Balancing Redox Equations

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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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A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
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Stable, Dual Redox Unit Organic Electrodes.

So Young An1, Tyler B Schon1, Dwight S Seferos1,2

  • 1Department of Chemistry, Lash Miller Chemical Labs, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 2H6, Canada.

ACS Omega
|January 28, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed novel organic materials with dual redox units for superior electrochemical energy storage. These materials demonstrate excellent cycling stability in lithium-ion batteries, paving the way for advanced energy solutions.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Organic materials offer sustainable alternatives for electrochemical energy storage due to abundance and low toxicity.
  • Current research often utilizes single redox moieties, limiting theoretical capacity and stability.
  • Triptycene-based quinones and perylene diimides are promising redox-active units.

Purpose of the Study:

  • To synthesize and evaluate organic materials incorporating two distinct redox units (triptycene-based quinones and perylene diimides).
  • To investigate the impact of dual redox design on electrochemical performance and stability.
  • To explore the potential of these materials in lithium-ion battery applications.

Main Methods:

  • Synthesis of framework and small molecule compounds featuring dual redox units.
  • Electrochemical testing of synthesized materials in lithium-ion battery configurations.
  • Analysis of cycling retention and stability over extended periods (500 cycles at 1 C).

Main Results:

  • Successful synthesis of organic materials with dual redox units (triptycene quinones and perylene diimides).
  • Framework and small molecule compounds exhibited excellent cycling retention (75% and 77%, respectively) over 500 cycles.
  • The dual redox design contributed to high theoretical capacity and material stability due to rigidity and insolubility.

Conclusions:

  • Incorporating multiple redox units in organic cathodic materials enhances electrochemical energy storage performance.
  • Redox-active triptycene linkages are crucial for achieving high cycling stability in organic batteries.
  • Dual redox materials present a promising strategy for developing next-generation, stable, and high-capacity energy storage solutions.