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Related Concept Videos

Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
Types of Reversible Electrodes01:24

Types of Reversible Electrodes

For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
Processes at Electrodes01:30

Processes at Electrodes

The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Standard Electrode Potentials03:02

Standard Electrode Potentials

On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...

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Phase transition in porous electrodes.

Kenji Kiyohara1, Takushi Sugino, Kinji Asaka

  • 1Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka, Japan. k.kiyohara@aist.go.jp

The Journal of Chemical Physics
|April 26, 2011
PubMed
Summary

Electrochemical thermodynamics in porous electrodes differ from bulk electrolytes. Monte Carlo simulations reveal first-order phase transitions and discontinuous changes in ion density within porous materials.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Computational Physics

Background:

  • Electrochemical systems often involve porous electrodes.
  • Understanding electrolyte behavior in confined geometries is crucial for device performance.
  • Bulk electrolyte thermodynamics may not accurately represent conditions within porous structures.

Purpose of the Study:

  • To investigate the electrochemical thermodynamics of electrolytes within porous electrodes.
  • To compare electrolyte behavior in porous versus planar electrode systems.
  • To identify phase transitions and critical phenomena in porous electrode electrolytes.

Main Methods:

  • Monte Carlo simulations were employed to model electrolyte behavior.
  • The study focused on pore sizes comparable to electrolyte ion sizes.
  • Electrochemical potentials and ion densities were analyzed.

Main Results:

  • Electrolyte thermodynamics in porous electrodes are qualitatively different from bulk systems.
  • First-order phase transitions occur in porous electrodes.
  • Surface charge density and ion density exhibit discontinuous changes at specific voltages.

Conclusions:

  • Porous electrode geometry significantly alters electrolyte thermodynamics.
  • Phase transitions in porous electrodes are driven by pore size relative to ion size.
  • Critical points for these phase transitions were identified, offering insights into electrochemical device behavior.