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Related Concept Videos

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

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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...
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Interfacial Electrochemical Methods: Overview01:06

Interfacial Electrochemical Methods: Overview

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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: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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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.
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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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.
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Beyond Capacitance: Rethinking the Stability of Ion-Selective Electrodes With Carbon-Based Solid Contacts.

Emily E A Robinson1, Yevedzo E Chipangura1, Hiroki D Coyle1

  • 1Department of Chemistry, University of Minnesota, 207 Pleasant St. SE, Minneapolis, Minnesota 55455, United States.

Analytical Chemistry
|November 13, 2025
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Summary
This summary is machine-generated.

Large-surface-area carbon materials used in ion-selective electrodes (ISEs) can suffer from potential drift due to unexpected redox reactions. Suppressing these reactions is key for stable, calibration-free electrodes.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Analytical Chemistry

Background:

  • Large-surface-area carbon materials are widely used as solid-contact (SC) materials in ion-selective electrodes (ISEs) due to their high non-faradaic capacitance, which is linked to potential stability.
  • However, single-walled carbon nanotube (SWCNT) SC interfaces exhibit slow potential discharge caused by unexpected redox processes, leading to potential drift and limiting long-term SC-ISE stability.

Purpose of the Study:

  • To investigate and differentiate redox reactions from charge redistribution artifacts in various high-surface-area carbon materials used as SCs.
  • To compare the stability and redox behavior of nanographite, mesoporous carbon nanospheres (MCN), and SWCNTs under potentiometric conditions.

Main Methods:

  • Employed a sequential chronopotentiometry (CP), chronoamperometry (CA), and open-circuit potential (Pot) measurement sequence (CP-CA-CP-Pot-CP).
  • Applied small voltages to mimic real-life potentiometer input impedance effects.
  • Conducted contact angle measurements to assess surface oxidation after prolonged voltage application.

Main Results:

  • MCN and nanographite interfaces showed no capacitance changes after small voltage applications, unlike SWCNT interfaces.
  • Contact angle measurements indicated surface oxidation in SWCNTs, MCN, and nanographite after one day of small voltage application, with nanographite being most sensitive to oxygen.
  • Discharge mechanisms differ significantly across carbon materials, demonstrating that high capacitance alone does not ensure electrode stability.

Conclusions:

  • High capacitance in carbon solid contacts does not guarantee electrode stability; minimizing redox reactivity is crucial.
  • The development of high-surface-area carbon materials with suppressed redox activity is essential for advancing SC-ISEs towards improved long-term stability and calibration-free operation.