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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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Radical Formation: Abstraction00:47

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The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
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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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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.
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Radical Formation: Homolysis00:54

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A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
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Rational Design and Dynamic Ru Exsolution Enables Active Heterostructures Surpassing Pt for Alkaline Hydrogen

Liuchen Wang1, Bing Li1, Mingyu Li2

  • 1School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.

Journal of the American Chemical Society
|November 24, 2025
PubMed
Summary
This summary is machine-generated.

Designing new catalysts for the hydrogen evolution reaction (HER) is key for sustainable hydrogen production. This study reveals a method to create highly active exsolved Ru/perovskite heterostructures for efficient alkaline HER.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Efficient hydrogen evolution reaction (HER) is crucial for sustainable hydrogen production via water electrolysis.
  • Heterostructure catalysts offer enhanced alkaline HER activity by improving water dissociation and hydrogen generation.
  • Rational design of robust and active heterostructures remains a significant challenge.

Purpose of the Study:

  • To correlate bias-driven dynamic surface reconstruction of ruthenate perovskites with their O 2p band center.
  • To design exsolved Ru/perovskite heterostructures for highly efficient alkaline HER.
  • To provide guidelines for designing efficient heterostructure electrocatalysts.

Main Methods:

  • Utilized BaRuO3 as a model system due to its O 2p band center proximity to the Fermi level.
  • Investigated bias-driven dynamic surface reconstruction under HER conditions.
  • Employed microscopy and spectroscopy, including in situ transmission electron microscopy, to confirm exsolution and oxygen vacancies.

Main Results:

  • Achieved exsolved Ru on BaRuO3 with abundant oxygen vacancies.
  • Demonstrated approximately 120-fold enhancement in HER activity post-reconstruction.
  • Observed a mass activity ~1.68 times higher than commercial Pt/C at 80 mV overpotential.
  • Confirmed perovskite oxides facilitate water dissociation and exsolved Ru promotes hydrogen generation.

Conclusions:

  • Developed a bias-driven dynamic reconstruction strategy applicable to various perovskite oxides.
  • Identified the electronic structure descriptor for oxide catalyst exsolution behavior.
  • Provided a pathway for designing efficient heterostructure electrocatalysts for alkaline HER.