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Related Concept Videos

Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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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...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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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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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

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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

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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 Reactions03:11

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Oxidation–Reduction Reactions
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Rapid and efficient redox processes within 2D covalent organic framework thin films.

Catherine R DeBlase1, Kenneth Hernández-Burgos1, Katharine E Silberstein1

  • 1Department of Chemistry and Chemical Biology, Cornell University, Baker Laboratory, Ithaca, New York 14853-1301, United States.

ACS Nano
|February 13, 2015
PubMed
Summary
This summary is machine-generated.

Oriented thin films of two-dimensional covalent organic frameworks (2D COFs) significantly boost pseudocapacitive energy storage. This morphology control enhances electrochemical accessibility and capacitance by 400% compared to powders.

Keywords:
covalent organic frameworkelectrochemistryenergy storagenanoporous materialspolymer filmssupercapacitorssurface science

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Two-dimensional covalent organic frameworks (2D COFs) offer potential for energy storage due to their porous, redox-active structures.
  • Organizing redox-active subunits in COFs is crucial for efficient pseudocapacitive energy storage.

Purpose of the Study:

  • To develop a method for synthesizing crystalline, oriented thin films of redox-active 2D COFs on gold working electrodes.
  • To investigate the effect of film thickness and orientation on electrochemical accessibility and capacitance.

Main Methods:

  • Controlled synthesis of 2D COF thin films on Au electrodes by varying monomer concentration.
  • Characterization of film thickness and morphology.
  • Electrochemical measurements (capacitance) of functionalized electrodes.

Main Results:

  • Achieved controlled thickness of 2D COF films (sub-200 nm).
  • Demonstrated high electrochemical accessibility (80-99%) of anthraquinone groups in oriented films.
  • Observed a 400% increase in area-scaled capacitance for oriented films compared to microcrystalline powders.

Conclusions:

  • Oriented 2D COF thin films significantly enhance pseudocapacitive energy storage performance.
  • Controlling COF morphology is critical for optimizing electrochemical energy storage devices.
  • Redox-active COFs show great promise for advanced electrical energy storage applications.