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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 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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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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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.
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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Spinels: Controlled Preparation, Oxygen Reduction/Evolution Reaction Application, and Beyond.

Qing Zhao1, Zhenhua Yan1, Chengcheng Chen1

  • 1Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering, College of Chemistry, Nankai University , Tianjin 300071, China.

Chemical Reviews
|July 27, 2017
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Summary
This summary is machine-generated.

This review summarizes spinel materials (AB2O4) and their controlled preparation for catalysis, particularly oxygen reduction/evolution reactions (ORR/OER). Optimized spinels enhance energy devices like fuel cells and batteries.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Spinel materials (AB2O4) exhibit diverse magnetic, optical, electrical, and catalytic properties.
  • These properties are crucial for applications in data storage, biotechnology, electronics, sensors, and energy conversion.

Purpose of the Study:

  • To review controlled preparation methods for spinels.
  • To summarize spinel applications in oxygen reduction/evolution reactions (ORR/OER) and other catalytic processes.
  • To highlight the relationship between physicochemical characteristics and performance.

Main Methods:

  • Summarized solid-, solution-, and vapor-phase preparation techniques.
  • Highlighted novel synthesis approaches for spinels.
  • Discussed methods for regulating spinel composition, structure, morphology, defects, and substrates.

Main Results:

  • Controlled preparation yields spinels with enhanced ORR/OER catalytic activity.
  • Optimized spinels improve fuel cells, metal-air batteries, and water splitting devices.
  • Spinel properties can be rationally tuned for specific applications.

Conclusions:

  • Spinel development is key for addressing environmental and energy challenges.
  • Future research requires precise preparation and advanced characterization of new spinel species.
  • Spinel applications extend beyond ORR/OER to magnetic, optical, and electrical fields.