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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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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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Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Surface polarization matters: enhancing the hydrogen-evolution reaction by shrinking Pt shells in Pt-Pd-graphene

Song Bai1, Chengming Wang, Mingsen Deng

  • 1Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Materials Science, and Laboratory of Engineering and Material Science, University of Science and Technology of China, Hefei, Anhui 230026 (P. R. China) http://staff.ustc.edu.cn/∼yjxiong/

Angewandte Chemie (International Ed. in English)
|August 27, 2014
PubMed
Summary

This study introduces novel platinum-palladium-graphene structures for enhanced hydrogen evolution reaction (HER) catalysis. Thinner platinum shells on these hybrid nanomaterials significantly boost HER activity by optimizing surface charge, reducing precious metal usage.

Keywords:
hybrid structureshydrogen-evolution reactionnanocrystalssurface polarizationwork function

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Surface charge state is critical for nanocrystal catalytic performance.
  • Platinum and palladium alloys are key catalysts, but cost and efficiency are concerns.

Purpose of the Study:

  • To synthesize unique Pt-Pd-graphene stack structures with tunable Pt shell thickness.
  • To investigate the correlation between Pt shell thickness and hydrogen evolution reaction (HER) activity.
  • To elucidate the underlying mechanisms governing catalytic performance.

Main Methods:

  • Synthesis of Pt-Pd-graphene hybrid structures with controlled Pt shell thickness.
  • Electrocatalytic testing for hydrogen evolution reaction (HER).
  • First-principles simulations to analyze surface polarization and charge states.

Main Results:

  • HER activity increases as the platinum shell thickness decreases.
  • Surface polarization, driven by work function differences between Pt and Pd, tunes the Pt surface charge state.
  • Graphene support facilitates efficient charge transport, further enhancing HER activity.

Conclusions:

  • Decreasing Pt shell thickness in Pt-Pd-graphene structures enhances HER performance.
  • Surface polarization and efficient charge transport are key mechanisms for improved catalysis.
  • This approach offers a strategy to reduce platinum loading while maintaining high catalytic efficiency.