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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: 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 Alkenes: Catalytic Hydrogenation02:13

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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.
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MoB/g-C3 N4 Interface Materials as a Schottky Catalyst to Boost Hydrogen Evolution.

Zechao Zhuang1, Yong Li2, Zilan Li1

  • 1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China.

Angewandte Chemie (International Ed. in English)
|November 10, 2017
PubMed
Summary

Developing efficient catalysts for the hydrogen evolution reaction (HER) is crucial. This study presents a novel Schottky catalyst that enhances proton adsorption and HER activity by leveraging metal-semiconductor junctions.

Keywords:
Schottky junctionelectrocatalysisgraphitic carbon nitridehydrogen evolution reactionmolybdenum boride

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Proton adsorption is key for efficient hydrogen evolution reaction (HER) catalysis.
  • Tuning proton adsorption without affecting catalyst metallicity is a significant challenge.

Purpose of the Study:

  • To develop a Schottky catalyst that optimizes proton adsorption for enhanced HER activity.
  • To investigate the charge transfer dynamics at a metal-semiconductor interface for catalytic applications.

Main Methods:

  • Fabrication of a Schottky catalyst using metallic MoB and n-type semiconductive g-C3N4.
  • Characterization using spectroscopic techniques to confirm charge transfer and electron density changes.
  • Electrochemical measurements to evaluate HER activity (Tafel slope, exchange current density).
  • First-principle calculations to elucidate reaction mechanisms and kinetic barriers.

Main Results:

  • The MoB/g-C3N4 Schottky junction facilitated vigorous charge transfer and increased local electron density on the MoB surface.
  • The Schottky catalyst demonstrated superior HER activity compared to pristine MoB, with a low Tafel slope (46 mV dec⁻¹) and high exchange current density (17 μA cm⁻²).
  • First-principle calculations confirmed that the Schottky contact significantly reduced kinetic barriers for proton adsorption and reduction.

Conclusions:

  • Schottky catalysts based on metal-semiconductor junctions offer a promising strategy for enhancing HER performance.
  • The engineered charge transfer at the MoB/g-C3N4 interface effectively optimizes proton adsorption and surface hydrogen generation.
  • This approach provides a new pathway for designing advanced electrocatalysts by precisely tuning interfacial electronic properties.