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Related Concept Videos

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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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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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Properties of Transition Metals02:58

Properties of Transition Metals

28.8K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Related Experiment Video

Updated: Dec 10, 2025

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
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Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

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Closest Packing Polymorphism Interfaced Metastable Transition Metal for Efficient Hydrogen Evolution.

Xinyue Tan1, Shize Geng1,2, Yujin Ji2

  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Jiangsu, 215123, China.

Advanced Materials (Deerfield Beach, Fla.)
|September 1, 2020
PubMed
Summary
This summary is machine-generated.

Researchers created a novel interface in cobalt-nickel alloys, stabilizing metastable materials for enhanced catalytic applications. This breakthrough improves performance in hydrogen evolution reactions, paving the way for advanced energy conversion technologies.

Keywords:
closest packingelectrocatalystshydrogen evolution reactionpolymorphism interfacetransition metal alloys

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Metastable materials offer unique properties but suffer from inherent instability, limiting their practical use.
  • Developing strategies to enhance the stability of metastable materials is crucial for unlocking their full potential.

Purpose of the Study:

  • To address the instability of metastable materials by creating an in situ polymorphism interface (inf).
  • To investigate the impact of this interface on the catalytic performance of cobalt-nickel (CoNi) alloys for the hydrogen evolution reaction (HER).

Main Methods:

  • Constructing an in situ polymorphism interface between metastable hexagonal-close-packed (hcp) and stable face-centered cubic (fcc) phases in CoNi alloy.
  • Utilizing computational calculations to analyze interfacial synergism, formation energy, and stability.
  • Evaluating the catalytic activity and stability of the optimized CoNi-inf for HER in alkaline media.

Main Results:

  • The CoNi-inf demonstrated significantly enhanced stability and lowered formation energy due to interfacial synergism.
  • Optimized CoNi-inf achieved a low overpotential of 72 mV at 10 mA cm⁻² and a Tafel slope of 57 mV dec⁻¹ for HER.
  • The catalyst exhibited superior performance compared to state-of-the-art non-noble-metal HER catalysts and maintained activity over 14 hours.

Conclusions:

  • The in situ polymorphism interface effectively stabilizes metastable CoNi alloys.
  • The CoNi-inf presents a highly efficient and stable non-noble metal catalyst for the hydrogen evolution reaction.
  • This study offers a novel strategy for designing advanced metastable catalysts for energy conversion applications.