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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

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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 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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Updated: May 29, 2025

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Enhancing hydrogen evolution by heterointerface engineering of Ni/MoN catalysts.

Junzheng Jiang1, Yunfan Qiu1, Hao Dong1

  • 1Hubei Key Laboratory of Plasma Chemistry and Advanced Materials, Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan 430205 China.

Journal of Colloid and Interface Science
|February 7, 2025
PubMed
Summary

This study introduces a novel Ni/MoN electrocatalyst for efficient hydrogen evolution reaction (HER). The heterostructure enhances hydrogen adsorption and catalytic activity, paving the way for cost-effective water splitting applications.

Keywords:
Built-in electric fieldElectronic interactionsHeterointerfaceHydrogen evolution reactionWater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Molybdenum nitrides are promising for hydrogen evolution reaction (HER) due to stability and metallic properties.
  • Poor hydrogen adsorption limits molybdenum nitride performance in HER.
  • Understanding active sites and mechanisms at catalyst heterointerfaces is crucial for enhancing HER.

Purpose of the Study:

  • To fabricate a Ni/MoN heterostructure electrocatalyst to improve hydrogen adsorption and HER performance.
  • To elucidate the role of electronic interactions and active sites at the Ni/MoN heterointerface.
  • To investigate the fundamental mechanisms of water splitting via density-functional theory (DFT) calculations.

Main Methods:

  • Fabrication of a composite electrocatalyst with Ni and MoN phases forming a heterointerface (Ni/MoN).
  • Electrochemical characterization of the Ni/MoN electrocatalyst for HER performance in alkaline media.
  • Density-functional theory (DFT) calculations to determine active sites and reaction mechanisms.

Main Results:

  • The Ni/MoN heterointerface facilitates electron transfer and creates a built-in electric field, optimizing charge transfer.
  • DFT calculations reveal H2O dissociation at Ni sites and H2 desorption at Mo sites.
  • The Ni/MoN/CC catalyst achieved an overpotential of 95 mV for 10 mA cm-2 and a Tafel slope of 104 mV dec-1, with excellent stability.

Conclusions:

  • Modulating the electronic structure of transition metal-based heterostructures is an effective strategy for high-performance electrocatalysts.
  • The Ni/MoN heterostructure demonstrates significant potential for efficient and stable hydrogen evolution reaction.
  • This approach offers a commercially viable pathway for designing advanced electrocatalysts for water splitting.