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Voltammetry: Overview01:20

Voltammetry: Overview

1.9K
Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
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Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

485
Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
485
Electrodes: Overview01:17

Electrodes: Overview

1.8K
 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...
1.8K
Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

665
Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
665
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

892
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...
892
Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

203
A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
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Updated: Aug 31, 2025

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

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Accurate and stable chronic in vivo voltammetry enabled by a replaceable subcutaneous reference electrode.

Elaine Marie Robbins1, Elisa Castagnola1, Xinyan Tracy Cui1,2,3

  • 1Department of Bioengineering, University of Pittsburgh, 5057 Biomedical Science Tower 3, 3501 Fifth Avenue, Pittsburgh, PA 15260, USA.

Iscience
|August 23, 2022
PubMed
Summary

A new method using a replaceable subcutaneous reference electrode prevents Ag/AgCl electrode degradation during in vivo neurotransmitter sensing. This technique ensures accurate electrochemical measurements in the brain for extended periods.

Keywords:
Electrochemistry experimental methodsMethodology in biological sciencesNeuroscience

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Area of Science:

  • Neuroscience
  • Electrochemistry
  • Biomedical Engineering

Background:

  • In vivo sensing of neurotransmitters is crucial for understanding brain function and disease.
  • Chronically implanted Ag/AgCl reference electrodes degrade, causing potential errors in electrochemical measurements.
  • Reference electrode polarization is a significant challenge in long-term in vivo studies.

Purpose of the Study:

  • To develop and validate a simple, effective method to protect in vivo sensing measurements from reference polarization.
  • To compare the performance of a brain-implanted reference electrode versus a subcutaneously implanted reference electrode.
  • To assess the long-term stability and accuracy of electrochemical recordings using a subcutaneous reference.

Main Methods:

  • Comparison of brain-implanted and subcutaneous Ag/AgCl reference electrodes in acute preparations.
  • Chronic implantation and monitoring of reference electrodes over three weeks.
  • Electrochemical measurements including impedance and dopamine redox peak separation.
  • Surface morphology and composition analysis using scanning electron microscopy.
  • Postmortem histological analysis of surrounding brain tissue.

Main Results:

  • No significant difference in impedance or dopamine redox peak separation between brain and subcutaneous references in acute preparations.
  • Elimination of peak background potential and dopamine oxidation potential shifts over three weeks with the subcutaneous reference.
  • Scanning electron microscopy revealed surface changes in chronically implanted Ag/AgCl electrodes.
  • Histology indicated cell death and gliosis around chronically implanted brain references.

Conclusions:

  • A replaceable subcutaneous reference electrode effectively prevents polarization and degradation issues associated with chronically implanted Ag/AgCl electrodes.
  • This technique significantly improves the accuracy and reliability of in vivo electrochemical measurements for neurotransmitter sensing.
  • The proposed method offers a simple yet powerful solution for a wide range of in vivo electrochemistry applications, enhancing data integrity and reducing tissue damage.