Electrochemical Impedance Spectroscopy

Обзор

Source: Kara Ingraham, Jared McCutchen, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT

Electrical resistance is the ability of an electrical circuit element to resist the flow of electricity. Resistance is defined by Ohm's Law:

Equation 1    (Equation 1)

Where Equation 2 is the voltage and Equation 3 is the current. Ohm's law is useful for determining the resistance of ideal resistors. However, many circuit elements are more complex and can't be described by resistance alone. For example, if an alternating current (AC) is used then the resistivity will often depend on the frequency of the AC signal. Instead of using resistance alone, electrical impedance is a more accurate and generalizable measure of a circuit element's ability to resist the flow of electricity.

Most commonly, the goal of electrical impedance measurements is the deconvolution of a sample's total electrical impedance into contributions from different mechanisms such as resistance, capacitance, or induction.

Процедура
  1. Obtain a test module and hook it up to the EIS instruments via two electrodes. The test module, pictured in Figure 3, provides data that can be used to model a simple, known circuit. It can be used to confirm that the wires are hooked up to the machine correctly and that all the machinery parts are functioning.

Figure 3
Figure 3: Test module.

Log in or to access full content. Learn more about your institution’s access to JoVE content here

Результаты

Results of EIS are often presented in a Nyquist plot, which shows real impedance versus complex impedance at each frequency tested. The plot of the experiment ran can be seen in Figure 6.

Figure 6
Figure 6: Screenshot of computer after Nyquist plot was obtained. 

Log in or to access full content. Learn more about your institution’s access to JoVE content here

Заявка и Краткое содержание

Electrochemical Impedance Spectroscopy is a useful tool for determining how a new material or device impedes the flow of electricity. It does this by applying an AC signal through the electrodes connected to the sample. The data is collected and plotted by the computer in the complex plain. With the help of software, the graph can be modeled after specific parts of a circuit. This data can often be very complicated and requires careful analysis. This technique, however complex, is an extremely useful non-destructive mean

Log in or to access full content. Learn more about your institution’s access to JoVE content here

Теги
Electrochemical Impedance SpectroscopyCharacterize MaterialsFlow Of ElectricityMicrobiologyCorrosion ResistanceElectrical ConductivityDetect ChangesSinusoidal Electrical LoadFrequenciesImpedance ComputationEquivalent Circuit ModelTotal Electrical ImpedanceResistanceCapacitanceInductionPrinciples And ProceduresCreate Equivalent Circuit ModelsElectrical ResistanceOhm s LawAC CurrentsElectrical Impedance

Перейти к...

0:08

Overview

1:35

Principles of Electric Impedance Spectroscopy

4:21

Measuring and Modeling Impedance

6:20

Calculating Impedance

7:24

Applications

8:28

Summary

Видео из этой коллекции:

article

Now Playing

Electrochemical Impedance Spectroscopy

Materials Engineering

22.9K Просмотры

article

Optical Materialography Part 1: Sample Preparation

Materials Engineering

15.2K Просмотры

article

Optical Materialography Part 2: Image Analysis

Materials Engineering

10.8K Просмотры

article

X-ray Photoelectron Spectroscopy

Materials Engineering

21.3K Просмотры

article

X-ray Diffraction

Materials Engineering

87.0K Просмотры

article

Focused Ion Beams

Materials Engineering

8.7K Просмотры

article

Directional Solidification and Phase Stabilization

Materials Engineering

6.5K Просмотры

article

Differential Scanning Calorimetry

Materials Engineering

35.9K Просмотры

article

Thermal Diffusivity and the Laser Flash Method

Materials Engineering

13.1K Просмотры

article

Electroplating of Thin Films

Materials Engineering

19.4K Просмотры

article

Analysis of Thermal Expansion via Dilatometry

Materials Engineering

15.5K Просмотры

article

Ceramic-matrix Composite Materials and Their Bending Properties

Materials Engineering

7.9K Просмотры

article

Nanocrystalline Alloys and Nano-grain Size Stability

Materials Engineering

5.0K Просмотры

article

Hydrogel Synthesis

Materials Engineering

23.3K Просмотры

JoVE Logo

Исследования

Образование

О JoVE

Авторские права © 2025 MyJoVE Corporation. Все права защищены