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Related Concept Videos

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.
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.
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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.
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Single-Atom Pt Embedded in Defective Layered Double Hydroxide for Efficient and Durable Hydrogen Evolution.

Jiamin Li1, Rui-Ting Gao1, Xianhu Liu2

  • 1College of Chemistry and Chemical Engineering, College of Energy Material and Chemistry, Inner Mongolia University, Hohhot 010021, China.

ACS Applied Materials & Interfaces
|August 29, 2023
PubMed
Summary

This study presents a novel single-atom catalyst for efficient hydrogen production in neutral water. The defected NiFeMo LDH with single-atom platinum achieves excellent activity and durability for the hydrogen evolution reaction (HER).

Keywords:
Pt single atomslong-term stabilityneutral HER performancephase transformationtransition metal (oxygen) hydroxide

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Electrocatalysis in neutral conditions is crucial for sustainable hydrogen production using wastewater or seawater.
  • Single-atom catalysts (SACs) show promise for electrocatalysis, but few are effective for the hydrogen evolution reaction (HER) in neutral media.

Purpose of the Study:

  • To develop a facile strategy for creating highly active SACs for HER in neutral conditions.
  • To investigate the synergistic effects of molybdenum species and single-atom platinum on NiFe layered double hydroxide (LDH) for enhanced electrocatalytic performance.

Main Methods:

  • Synthesis of defected NiFeMo LDH (V-NiFeMo LDH) by inducing Mo species and loading ultralow single-atom Pt.
  • Electrocatalytic testing for HER in 1 M phosphate buffer solution.
  • Potentiostatic polarization for catalyst modulation and density functional theory (DFT) calculations.

Main Results:

  • The V-NiFeMo LDH catalyst exhibited an overpotential of 89 mV at 10 mA cm⁻² for HER.
  • Modulation of single-atom Pt on V-NiFeMo LDH achieved a low potential of 37 mV at 10 mA cm⁻² with over 110 hours of durability.
  • Synergistic effects of Mo and Pt, along with phase transformation, significantly reduced the water dissociation barrier and accelerated the HER.

Conclusions:

  • The developed V-NiFeMo LDH with single-atom Pt is a highly efficient and durable catalyst for neutral HER.
  • This work demonstrates a promising approach for designing advanced SACs for sustainable hydrogen production in neutral media.