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Related Concept Videos

Potentiometry: Overview01:06

Potentiometry: Overview

4.9K
Potentiometry is an analytical technique that measures the potential difference between two electrodes in an electrochemical cell without drawing any significant current that could alter the solution's composition. This method employs an indicator electrode, which exchanges electrons with the analyte solution, and a reference electrode with a constant potential. Each electrode is immersed in a solution comprised of two half-cells. In a conventional setup, the reference electrode serves as...
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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...
788
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

1.9K
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...
1.9K
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

2.2K
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...
2.2K
Standard Electrode Potentials03:02

Standard Electrode Potentials

51.1K
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...
51.1K
Potentiometer01:30

Potentiometer

2.2K
Voltage and current measurements using a standard voltmeter and ammeter alter the circuit being measured either by drawing or resisting the current flow, which introduces uncertainties in the measurements. Null measurements balance the voltages so that no current flows through the measuring device and, therefore, no alterations occur in the measured circuit.
Suppose the emf of a battery needs to be measured. If the battery is directly connected to a standard voltmeter, the measured quantity is...
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Characterizing Mediated Extracellular Electron Transfer in Lactic Acid Bacteria with a Three-Electrode, Two-Chamber Bioelectrochemical System
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Low-energy electron potentiometry.

Johannes Jobst1, Jaap Kautz2, Maria Mytiliniou2

  • 1Huygens-Kamerlingh Onnes Laboratorium, Leiden University, NL-2300 RA Leiden, P.O. Box 9504, Netherlands; Department of Physics, Columbia University, New York, New York 10027, USA.

Ultramicroscopy
|May 21, 2017
PubMed
Summary
This summary is machine-generated.

We developed a new low-energy electron potentiometry (LEEP) technique using the mirror mode transition. This method visualizes local electrostatic surface potential variations in diverse materials, advancing electronic transport understanding.

Keywords:
LEEMLow-energy electron microscopyPotentiometryTransport propertiesWork function

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Area of Science:

  • Materials Science
  • Surface Science
  • Condensed Matter Physics

Background:

  • Charge transport in many systems is locally determined, not a global property.
  • Understanding local electronic potential is key for realistic device analysis.
  • Previous low-energy electron microscopy (LEEM) potentiometry relied on specific material reflectivity spectra.

Purpose of the Study:

  • To introduce and validate a new low-energy electron potentiometry (LEEP) method.
  • To enable potentiometry on a wider range of materials.
  • To compare the robustness of two LEEP techniques.

Main Methods:

  • Utilized the universal mirror mode transition in low-energy electron potentiometry (LEEP).
  • LEEP measures local electrostatic surface potential via electron reflectivity changes near zero landing energy.
  • Demonstrated LEEP on Si(111) and a metal-semiconductor-metal junction.

Main Results:

  • The mirror mode transition provides a universal LEEP method applicable to more materials.
  • Successfully mapped intrinsic potential variations on Si(111).
  • Visualized the Schottky effect at a metal-semiconductor interface under bias.

Conclusions:

  • The mirror mode LEEP technique broadens the applicability of electron potentiometry.
  • LEEP offers a robust, non-invasive method for probing local electronic potentials.
  • This technique enhances the understanding of charge transport in complex materials and devices.