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Related Concept Videos

Catalysis02:50

Catalysis

30.1K
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

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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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PdMo bimetallene for oxygen reduction catalysis.

Mingchuan Luo1,2, Zhonglong Zhao3, Yelong Zhang1

  • 1Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, China.

Nature
|September 27, 2019
PubMed
Summary
This summary is machine-generated.

A novel palladium-molybdenum (PdMo) bimetallene catalyst efficiently drives oxygen reduction and evolution reactions in alkaline electrolytes. This breakthrough offers a stable, high-performance alternative for renewable energy applications and advanced batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Electrocatalytic processes are crucial for renewable energy, but sluggish oxygen reduction (ORR) and oxygen evolution (OER) kinetics are major challenges.
  • Platinum-group metal catalysts are often required for high activity, but are expensive and less effective in alkaline media.

Purpose of the Study:

  • To develop a highly active and stable electrocatalyst for ORR and OER in alkaline electrolytes.
  • To explore the potential of palladium-molybdenum (PdMo) bimetallene as a cathode material for Zn-air and Li-air batteries.

Main Methods:

  • Synthesis of PdMo bimetallene, a sub-nanometre-thick, highly curved metal nanosheet.
  • Electrochemical characterization of PdMo bimetallene for ORR and OER activity and durability in alkaline electrolytes.
  • Density functional theory (DFT) calculations to understand structure-activity relationships.

Main Results:

  • PdMo bimetallene exhibits high mass activity (16.37 A/mg Pd for ORR) and stability over 30,000 cycles.
  • Achieved mass activity is significantly higher than commercial Pt/C and Pd/C catalysts.
  • DFT calculations indicate optimized oxygen binding due to alloying, strain, and quantum size effects.

Conclusions:

  • PdMo bimetallene is a promising, efficient, and stable electrocatalyst for ORR and OER in alkaline media.
  • Its unique structure and electronic properties offer a pathway for improved energy storage and conversion devices.
  • Metallene materials represent a new class of promising catalysts for energy electrocatalysis.