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Related Concept Videos

Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

907
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...
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Electrodes: Overview01:17

Electrodes: Overview

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 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...
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Potentiometry: Membrane Electrodes01:15

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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...
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Standard Electrode Potentials03:02

Standard Electrode Potentials

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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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Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

328
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...
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A Method for Systematic Electrochemical and Electrophysiological Evaluation of Neural Recording Electrodes
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Long-Time Evaluation of Solid-State Composite Reference Electrodes.

Slim Blidi1, Kim Granholm1, Tomasz Sokalski1

  • 1Johan Gadolin Process Chemistry Centre, Laboratory of Molecular Science and Engineering, Åbo Akademi University, Henriksgatan 2, FI-20500 Turku-Åbo, Finland.

Membranes
|June 23, 2022
PubMed
Summary
This summary is machine-generated.

Solid-state composite (SSC) reference electrodes demonstrated excellent long-term stability and performance in calibrating sensors and analyzing environmental water samples, outperforming commercial electrodes.

Keywords:
long-time evaluationreference electrodesolid-state

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Environmental Science

Background:

  • Reference electrodes are crucial for accurate electrochemical measurements.
  • Solid-state composite (SSC) reference electrodes offer potential advantages in stability and handling.
  • Long-term performance evaluation of SSC electrodes in diverse conditions is essential.

Purpose of the Study:

  • To investigate the long-term performance and stability of solid-state composite (SSC) reference electrodes.
  • To evaluate the influence of solution properties (ionic strength, ion charge/mobility, pH) on SSC electrode performance.
  • To assess the suitability of SSC electrodes for calibrating sensors and analyzing environmental water samples.

Main Methods:

  • Continuous monitoring of electrode stability using potentiometry and electrochemical impedance spectroscopy over several months.
  • Application of a multi-solution protocol to test performance across varying ionic strengths, ion characteristics, and pH.
  • Utilizing SSC electrodes for calibration of commercial ion-selective electrodes and direct measurement in river water samples.

Main Results:

  • SSC reference electrodes exhibited high stability over extended monitoring periods.
  • Performance was consistent across a range of ionic strengths, ion charges, mobilities, and pH values.
  • Measurements of K+, Na+, Ca2+, and Cl- ions and pH in river water showed excellent agreement with an independent laboratory, surpassing commercial electrode performance.

Conclusions:

  • SSC reference electrodes provide reliable and stable electrochemical measurements.
  • They are highly effective for sensor calibration and environmental water analysis.
  • SSC electrodes offer a superior alternative to conventional commercial reference electrodes for various applications.