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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.
30.1K
Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
131.4K
Electric Field01:16

Electric Field

12.3K
Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
In the new picture, imagine that the first charge sets up an electric field independent of all other charges in the universe. When another charge comes in its vicinity, the second charge experiences an electric force depending on the electric field at that point. The source charge does not...
12.3K
Determining Electric Field From Electric Potential01:12

Determining Electric Field From Electric Potential

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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
In general, regardless of whether the electric field is uniform, it points in the direction of decreasing potential because the force on a positive...
4.9K
Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

5.4K
For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
5.4K
Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

7.2K
When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
Suppose a piece of metal is placed near a positive charge. The free electrons in the metal are attracted to the external positive charge and migrate freely toward that region. This region then...
7.2K

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Updated: Jan 20, 2026

Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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Seguimiento de los campos eléctricos en la interfaz Pt/H2O durante la catálisis del hidrógeno

Jaeyune Ryu1, Yogesh Surendranath1

  • 1Department of Chemistry , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States.

Journal of the American Chemical Society
|August 22, 2019
PubMed
Resumen
Este resumen es generado por máquina.

El campo eléctrico en las superficies de platino se amplifica significativamente en condiciones alcalinas debido al aumento de la concentración de protones (H +). Este estudio cuantifica este campo amplificado, crucial para la comprensión de la catálisis.

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Área de la Ciencia:

  • La electroquímica
  • Ciencias de la superficie
  • Catálisis

Sus antecedentes:

  • La comprensión del campo eléctrico interfacial es crucial para los procesos catalíticos.
  • El comportamiento de los protones (H +) en las superficies de los electrodos influye en las vías de reacción.

Objetivo del estudio:

  • Para cuantificar la magnitud del campo eléctrico interfacial en una superficie de platino (Pt) durante la catálisis H2/H+.
  • Para determinar la relación entre la concentración de protones en la superficie y la intensidad del campo eléctrico.

Principales métodos:

  • Se utilizó una reacción no faradaica sensible al pH catalizada en superficie para rastrear la concentración local de protones (H+).
  • Mantiene la superficie Pt en el potencial del electrodo de hidrógeno reversible a través de diferentes pH y intensidades iónicas.

Principales resultados:

  • Cuantificación directa de la caída del potencial electrostático en la interfaz Pt/solución.
  • Se ha establecido que el campo eléctrico interfacial aumenta en aproximadamente 60 mV por unidad de aumento del pH.

Conclusiones:

  • El campo eléctrico en la superficie Pt se amplifica significativamente en condiciones alcalinas en comparación con las condiciones ácidas.
  • Proporciona una visión directa del entorno de campo eléctrico crucial para la catálisis superficial.