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Related Concept Videos

Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

223
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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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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Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

149
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
149

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Electroanalytical Strategies for Local pH Sensing at Solid-Liquid Interfaces and Biointerfaces.

Isabell Wachta1, Kannan Balasubramanian1

  • 1Department of Chemistry and School of Analytical Sciences Adlershof (SALSA), Humboldt-Universität zu Berlin, 10099 Berlin, Germany.

ACS Sensors
|September 4, 2024
PubMed
Summary
This summary is machine-generated.

This review details advancements in sensors for measuring pH at solid-liquid and biological interfaces. These tools offer crucial insights into chemical reactions and cellular processes by detecting localized pH changes.

Keywords:
corrosionelectrified interfaceelectrocatalysisextracellular pHion selective electrodepH sensorpotentiometryscanning electrochemical microscopyultramicroelectrodevoltammetry

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Area of Science:

  • Analytical Chemistry
  • Surface Science
  • Biophysical Chemistry

Background:

  • pH at interfaces deviates from bulk solution, impacting reactions like electrocatalysis and corrosion.
  • Cellular metabolic activity alters extracellular interface pH, affecting biological processes.

Purpose of the Study:

  • To review recent progress in sensors for detecting pH at solid-liquid and bio-interfaces.
  • To highlight sensors with spatial and temporal resolution for interface analysis.

Main Methods:

  • Overview of two primary pH detection principles.
  • Description of molecules and materials used in active sensor components.
  • Focus on electroanalytical techniques for localized pH sensing.

Main Results:

  • Collection of recent advancements in interface pH sensing technologies.
  • Demonstration of sensor applications in electrocatalysis, corrosion, and cellular studies.

Conclusions:

  • Interface pH sensing shows promise for enhancing mechanistic understanding of reactions and processes.
  • Key challenges for wider adoption of these analytical approaches are discussed.