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Related Concept Videos

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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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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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.
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Escalating Catalytic Activity for Hydrogen Evolution Reaction on MoSe2@Graphene Functionalization.

Hoa Thi Bui1, Nguyen Duc Lam1, Do Chi Linh1

  • 1Institute of Materials Science, Vietnam Academy of Science and Technology, Hanoi 100000, Vietnam.

Nanomaterials (Basel, Switzerland)
|July 29, 2023
PubMed
Summary

This study developed a novel graphene-integrated molybdenum diselenide (MoSe2-Gr) composite for enhanced hydrogen evolution reaction (HER) catalysis. The new material significantly boosts efficiency and durability for green hydrogen production.

Keywords:
MoSe2@Grgraphene incorporationhydrogen evolution reaction

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient and durable electrocatalysts for the hydrogen evolution reaction (HER) is critical for sustainable energy solutions.
  • Molybdenum diselenide (MoSe2) shows promise for HER catalysis but suffers from layer stacking, reduced active sites, low conductivity, and poor electrical contact.
  • Existing challenges limit the practical application of MoSe2 in large-scale hydrogen production.

Purpose of the Study:

  • To engineer a novel MoSe2-based electrocatalyst with enhanced HER performance and stability.
  • To overcome the limitations of stacked MoSe2 layers and improve electrical conductivity for efficient catalysis.
  • To create a cost-effective and scalable method for producing advanced electrocatalysts for green hydrogen generation.

Main Methods:

  • Synthesized a MoSe2-graphene (Gr) composite by incorporating diethylene glycol into MoSe2 interlayers during thermal treatment at 600 °C in an inert atmosphere.
  • Investigated the structural changes, including widened interlayer spacing and increased exposure of active edge sites in MoSe2.
  • Evaluated the electrochemical performance of the MoSe2-Gr composite for HER in an acidic medium, comparing it to pristine MoSe2 and commercial Pt/C catalysts.

Main Results:

  • The in situ formed graphene within MoSe2 interlayers effectively widened the spacing, exposing more active edge sites.
  • The MoSe2-Gr composite demonstrated significantly enhanced HER catalytic activity in acidic media compared to pristine MoSe2.
  • The composite exhibited superior HER catalytic activity to the state-of-the-art Pt/C catalyst, especially at current densities above 55 mA cm-2, and showed excellent long-term electrochemical stability.

Conclusions:

  • The facile synthesis of MoSe2-Gr composite effectively addresses the limitations of pristine MoSe2 for HER catalysis.
  • The enhanced HER performance and stability make the MoSe2-Gr composite a promising candidate for efficient green hydrogen production.
  • This approach offers a scalable and novel strategy for developing advanced electrocatalysts for renewable energy applications.