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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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Hydrogen Bonds01:04

Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride01:26

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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
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Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells
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Tailored electronic interaction between metal-support trigger reverse hydrogen spillover for efficient hydrogen

Zichen Wang1, Jiancan Zhang1, Qiliang Wei2

  • 1College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108 Fujian, China.

Journal of Colloid and Interface Science
|February 19, 2025
PubMed
Summary
This summary is machine-generated.

We enhanced hydrogen evolution reaction (HER) catalysts by engineering the metal-support interface. This strategy boosts green hydrogen production by optimizing charge transfer and hydrogen spillover in platinum-nanocluster-decorated nitrogen-doped molybdenum carbide nanosheets.

Keywords:
Charge transferElectronic metal-support interactionHydrogen evolutionPt-based catalystReverse hydrogen spillover

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Hydrogen evolution reaction (HER) is key for green hydrogen production.
  • Optimizing catalyst activity requires decoupling activity from adsorption properties.
  • Fast hydrogen spillover is a crucial mechanism for efficient HER catalysis.

Purpose of the Study:

  • To tailor electronic interactions between 2D nitrogen-doped MoC (N-MoC) nanosheets and ultra-low content Pt nanoclusters.
  • To trigger reverse hydrogen spillover and modulate Pt electronic structure for efficient and stable HER.
  • To enhance the performance of electrocatalysts for green hydrogen production.

Main Methods:

  • Fabrication of 2D N-MoC nanosheets.
  • Decoration with ultra-low content (1 wt%) Pt nanoclusters.
  • Electrocatalytic performance testing for HER.
  • Experimental and theoretical analysis (DFT) of electronic structure and charge transfer.

Main Results:

  • Pt/N-MoC demonstrated a mass activity of 12.945 A mgPt-1, a 57.5-fold enhancement over Pt/C.
  • Achieved efficient and stable HER performance, verified in a proton exchange membrane water electrolyzer.
  • Demonstrated charge transfer from N-MoC to Pt, modulating Pt's d-band center for improved hydrogen adsorption/desorption (ΔG = 0.019 eV).
  • Reduced charge accumulation at the metal-support interface by tuning work functions, lowering the hydrogen spillover energy barrier.

Conclusions:

  • Tailoring metal-support electronic interactions is effective for decoupling HER catalyst activity from adsorption properties.
  • Ultra-low Pt loading on N-MoC nanosheets enables efficient and stable HER via reverse hydrogen spillover.
  • This approach significantly advances catalyst design for cost-effective green hydrogen generation.