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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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Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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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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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

11.8K
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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Radical Formation: Homolysis00:54

Radical Formation: Homolysis

3.5K
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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Updated: Jun 3, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

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Metastable fcc-Ru/fcc-RuO2 Heterointerphase for Hydrogen Evolution.

Zhicheng Ju1, Xiangkai Kong1

  • 1School of Materials and Physics and Center of Mineral Resource Waste Recycling, Jiangsu Key Laboratory for Clean Utilization of Carbon Resources, China University of Mining and Technology, Xuzhou, Jiangsu 221116, People's Republic of China.

Inorganic Chemistry
|January 13, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized metastable ruthenium dioxide (RuO2) catalysts using a novel crystallographic transformation. These catalysts exhibit enhanced properties for water dissociation, crucial for energy applications.

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Metastable crystal structures offer unique properties but are challenging to synthesize.
  • Ruthenium dioxide (RuO2) is a key material in catalysis, but its metastable forms are difficult to access.
  • Developing efficient catalysts for water dissociation is critical for energy technologies.

Purpose of the Study:

  • To develop a method for synthesizing metastable RuO2.
  • To investigate the catalytic performance of heterophase Ru/RuO2 catalysts.
  • To understand the relationship between crystal structure and catalytic activity.

Main Methods:

  • Employing a moderate crystallographic transformation strategy.
  • Controlling the degree of oxidation to create different heterophase Ru/RuO2 catalysts.
  • Characterizing the catalysts' structure and electrochemical performance.

Main Results:

  • Successfully synthesized metastable RuO2.
  • Constructed heterophase Ru/RuO2 catalysts with varying oxidation states.
  • Identified the metastable fcc-Ru/fcc-RuO2 heterointerphase as highly effective.
  • Achieved a current density of 10 mA cm-2 at a low potential of 11.2 mV due to improved crystal matching, water dissociation, and intermediate adsorption.

Conclusions:

  • A moderate crystallographic transformation is an effective strategy for synthesizing metastable RuO2.
  • The metastable fcc-Ru/fcc-RuO2 heterointerphase demonstrates superior catalytic activity for water dissociation.
  • This work offers a new approach for designing catalysts based on crystal phase engineering.