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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

111
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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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.
18.3K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.2K
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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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Covalency-reinforced oxygen evolution reaction catalyst.

Shunsuke Yagi1, Ikuya Yamada1,2, Hirofumi Tsukasaki3

  • 1Nanoscience and Nanotechnology Research Centre, Osaka Prefecture University, Osaka 599-8570, Japan.

Nature Communications
|September 11, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a stable and highly active perovskite catalyst, CaCu3Fe4O12, for water oxidation. This breakthrough addresses stability issues in current catalysts, paving the way for efficient energy conversion in batteries and solar water splitting.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is crucial for energy conversion in rechargeable metal-air batteries and solar water splitting.
  • ABO3 perovskites show high OER activity but suffer from poor stability, limiting their practical application.
  • Developing stable and efficient OER catalysts remains a significant challenge in energy research.

Purpose of the Study:

  • To investigate the potential of Fe(4+)-based quadruple perovskites for the oxygen evolution reaction.
  • To address the critical issue of catalyst instability in perovskite materials for energy applications.
  • To identify novel catalysts with high activity and long-term durability.

Main Methods:

  • Synthesis and characterization of the quadruple perovskite CaCu3Fe4O12.
  • Electrochemical evaluation of CaCu3Fe4O12 for the oxygen evolution reaction.
  • Comparative analysis with state-of-the-art OER catalysts, including Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-δ) and RuO2.

Main Results:

  • CaCu3Fe4O12 exhibits high catalytic activity for the oxygen evolution reaction, comparable to or exceeding state-of-the-art catalysts.
  • The unique covalent bonding network involving Cu(2+) and Fe(4+) ions imparts significant structural stability to the material.
  • The enhanced stability is directly linked to the catalyst's long-term performance and durability.

Conclusions:

  • The Fe(4+)-based quadruple perovskite CaCu3Fe4O12 is a promising candidate for efficient and stable oxygen evolution catalysis.
  • The structural robustness of CaCu3Fe4O12 overcomes the limitations of traditional ABO3 perovskites.
  • This discovery offers a new pathway for developing advanced catalysts for rechargeable batteries and solar fuel production.