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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...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

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...
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
Electrodes: Overview01:17

Electrodes: Overview

Electrochemical measurements are conducted in an electrochemical cell composed of various components that control and measure the current and potential. One fundamental component is electrodes, conductive materials that enable electron transfer reactions at their surfaces.
There are two main types of electrodes in electrochemical cells. The first type, known as the working or indicator electrode, has a potential that is sensitive to the analyte's concentration and reacts to changes in the...

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Related Experiment Video

Updated: Jun 16, 2026

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy
09:36

In Situ Lithiated Reference Electrode: Four Electrode Design for In-operando Impedance Spectroscopy

Published on: September 12, 2018

Note: Characterization of electrode materials for dielectric spectroscopy.

D Malleo1, J T Nevill, A van Ooyen

  • 1Nanoscale Systems Integration Group, School of Electronics and Computer Science, University of Southampton, Hampshire SO17 1BJ, United Kingdom. daniele.malleo@ogt.co.uk

The Review of Scientific Instruments
|February 2, 2010
PubMed
Summary
This summary is machine-generated.

To improve low-frequency dielectric measurements, researchers enhanced electrode surface area. Platinum black, iridium oxide, and polypyrrole/poly(styrenesulphonate) electrodes significantly increased effective capacitance, offering alternatives to platinum black.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Dielectric Spectroscopy

Background:

  • Electrode polarization impedes low-frequency dielectric measurements in aqueous samples.
  • Increasing electrode surface area can mitigate electrode polarization effects.
  • Common electrode materials like platinum black have limitations, including mechanical fragility and potential cytotoxicity.

Purpose of the Study:

  • To characterize and compare the effectiveness of platinum black, iridium oxide, and polypyrrole/poly(styrenesulphonate) (PPy/PSS) conducting polymer electrode surfaces.
  • To evaluate these materials as alternatives to bright platinum electrodes for dielectric measurements.
  • To assess the practical aspects and performance of novel electrode materials.

Main Methods:

  • Impedance spectroscopy was employed to analyze electrode/sample interface characteristics.
  • Equivalent circuit modeling was used to quantify the effective surface area increase.
  • Three novel electrode materials (platinum black, iridium oxide, PPy/PSS) were directly compared against a bright platinum electrode.

Main Results:

  • Platinum black, iridium oxide, and PPy/PSS increased electrode effective capacitance by factors of approximately 240, 75, and 790, respectively.
  • PPy/PSS demonstrated the largest enhancement in effective capacitance.
  • The study discussed the practical considerations for each electrode material.

Conclusions:

  • Iridium oxide and PPy/PSS are promising alternatives to platinum black for dielectric measurements.
  • These materials offer improved effective capacitance and overcome limitations associated with platinum black, such as mechanical damage and cytotoxicity.
  • Enhanced electrode surfaces are crucial for accurate low-frequency dielectric property measurements of aqueous samples.