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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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Hydrogen Bonds00:26

Hydrogen Bonds

131.4K
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....
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Electric Field01:16

Electric Field

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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

4.9K
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...
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Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

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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...
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Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

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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...
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Pt/H2Oインターフェースでの電場追跡

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
まとめ
この要約は機械生成です。

プラチナ表面の電気場は,陽子 (H+) 濃度が増加したため,アルカリ条件で著しく増幅されます. この研究は触媒の理解に不可欠な 放大された場を定量化しています

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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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科学分野:

  • 電気化学
  • 表面科学
  • カタリシス

背景:

  • インタフェースの電場を理解することは,触媒プロセスにとって極めて重要です.
  • 電子表面における陽子 (H+) の行動は反応経路に影響する.

研究 の 目的:

  • H2/H+触媒の際のプラチナ (Pt) 表面での界面電場の大きさを定量化する.
  • 表面の陽子濃度と電場強さの関係を決定する.

主な方法:

  • 局所的な陽子 (H+) 濃度を追跡するために,表面触媒化,pH感度の非ファラダイク反応を使用した.
  • 異なったpHとイオン強度で逆転可能な水素電極電位でPt表面を維持した.

主要な成果:

  • Pt/溶液界面での静電電位下落を直接定量化した.
  • 界面の電場はpHの単位増加ごとに約60mV増加することが確認された.

結論:

  • Pt表面の電場は,酸性条件と比較してアルカリ条件下で大幅に増幅されます.
  • 表面触媒に不可欠な電場環境への直接的な洞察を提供します.