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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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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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Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

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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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

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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 Reactions
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Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Mo6+ activated multimetal oxygen-evolving catalysts.

Peng Fei Liu1, Shuang Yang1, Li Rong Zheng2

  • 1Key Laboratory for Ultrafine Materials of Ministry of Education , School of Materials Science and Engineering , East China University of Science and Technology , Shanghai , 200237 , China .

Chemical Science
|May 17, 2017
PubMed
Summary
This summary is machine-generated.

High-valence molybdenum (Mo6+) enhances 3d metal catalysts for efficient oxygen evolution reaction (OER) in water splitting. These new FeCoMo catalysts demonstrate improved performance and stability for electrochemical fuel synthesis.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Water splitting is crucial for electrochemical fuel synthesis.
  • The oxygen evolution reaction (OER) kinetics are slow, limiting efficiency.
  • Existing 3d transition metal catalysts require high operating voltages.

Purpose of the Study:

  • To develop highly efficient OER catalysts.
  • To investigate the effect of high-valence metal modulation on OER performance.
  • To understand the structural and electronic modifications induced by molybdenum.

Main Methods:

  • Synthesis of multimetal FeCoMo (oxy)hydroxide catalysts.
  • Electrochemical testing for OER activity and stability.
  • In situ X-ray adsorption analysis to probe electronic structures.

Main Results:

  • FeCoMo catalysts achieved an overpotential of 277 mV at 10 mA cm⁻².
  • Catalysts exhibited stable performance for approximately 40 hours.
  • Molybdenum (Mo6+) successfully modulated the electronic structures of 3d metals.

Conclusions:

  • High-valence metal modulation is an effective strategy for designing advanced OER catalysts.
  • The amorphous FeCoMo catalysts show promise for efficient and stable electrochemical fuel production.
  • Tuned electronic structures are key to enhanced catalytic activity.