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Related Concept Videos

Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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An electric dipole is a system of two equal but opposite charges, separated by a fixed distance. This system is used to model many real-world systems, including atomic and molecular interactions. One of these systems is the water molecule, but only under certain circumstances. These circumstances are met inside a microwave oven, where electric fields with alternating directions make the water molecules change orientation. This vibration is equivalent to heat at the molecular level.
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Revealing Interface Polarization Effects on the Electrical Double Layer with Efficient Open Boundary Simulations

Margherita Buraschi1, Andrew P Horsfield2,3, Clotilde S Cucinotta1,3

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Simulating electrochemical devices at constant potential is challenging. This new method efficiently models electron flow, revealing how applied potential impacts electrocatalysis and enabling better device design.

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Area of Science:

  • Computational Chemistry
  • Materials Science
  • Electrochemistry

Background:

  • Modeling interfacial processes in electrochemical devices requires constant potential simulations.
  • This necessitates an open-boundary electron description for simulations.
  • Current methods face limitations in accurately representing these conditions.

Purpose of the Study:

  • To develop an efficient computational method for simulating electrochemical processes at constant potential.
  • To enable realistic modeling of electrochemical reactions under applied potential control.
  • To investigate the influence of local field effects on heterogeneous electrocatalysis.

Main Methods:

  • Interfacing density functional theory (DFT) with the hairy probe method in the weak coupling limit.
  • Systematic testing using parallel-plate capacitor models with pristine surfaces and adsorbed water.
  • Implementation validated for efficiency comparable to standard DFT calculations.

Main Results:

  • Demonstrated an efficient and accurate method for constant potential simulations in electrochemistry.
  • Revealed significant effects of local electric fields at the electrical double layer on catalytic step energies.
  • Quantified the impact of applied potential on electrochemical reaction pathways.

Conclusions:

  • Explicit modeling of applied potential is crucial for accurate electrochemical simulations.
  • The developed method provides an efficient tool for controlling potential in simulations.
  • This approach advances the realistic modeling of electrochemical devices and heterogeneous electrocatalysis.