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Related Concept Videos

Amperometry: Overview01:10

Amperometry: Overview

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Amperometry is a technique commonly used to measure the concentration of specific analytes in a solution by monitoring the electric current generated during an electrochemical reaction. It involves applying a constant potential between a working electrode and a reference electrode to measure the resulting current, which is proportional to the concentration of the analyte. The Clark oxygen electrode operates based on this principle of amperometry. It consists of a cathode and an anode enclosed...
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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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Ampere's Law01:18

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A fundamental property of a static magnetic field is that it is not conservative, unlike an electrostatic field. Instead, there is a relationship between the magnetic field and its source, electric current. Mathematically, this is expressed in terms of the line integral of the magnetic field, which is also known as Ampère’s law. It is valid only if the currents are steady and no magnetic materials or time-varying electric fields are present.
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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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

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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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Electrochemistry: Overview01:04

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Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
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Related Experiment Video

Updated: Nov 2, 2025

A Closed-Type Wireless Nanopore Electrode for Analyzing Single Nanoparticles
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Attoampere Nanoelectrochemistry.

Simon Grall1, Ivan Alić1, Eleonora Pavoni2

  • 1Institute of Biophysics, Johannes Kepler University, Linz, 4020, Austria.

Small (Weinheim an Der Bergstrasse, Germany)
|June 14, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces atto-Ampere sensitivity for nanoscale electrochemical measurements, enabling the study of single-molecule charge transport. Researchers achieved sub-80 nm spatial resolution, advancing nano-electrochemistry and surface science applications.

Keywords:
attoamperenano-electrochemistryradiofrequencyscanning tunneling microscopy

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Nanotechnology

Background:

  • Electrochemical microscopy currently offers micrometer to sub-micrometer resolution for surface chemistry.
  • Fundamental questions in charge transport at solid-electrolyte interfaces require nanoscale resolution.
  • Current techniques lack the sensitivity to detect atto-Ampere currents necessary for single-molecule electrochemistry.

Purpose of the Study:

  • To develop a nano-electrochemical technique with atto-Ampere sensitivity and nanoscale spatial resolution.
  • To investigate charge transport at the solid-liquid interface with unprecedented detail.
  • To resolve nanoscale differences in molecular organization and electrical properties.

Main Methods:

  • Local cyclic voltammetry (CV) measurements at the solid-liquid interface.
  • Utilizing GHz frequencies to measure the charging of local faradaic interface capacitance.
  • Achieving sub-atto-Ampere sensitivity and < 80 nm spatial resolution.

Main Results:

  • Demonstrated sub-atto-Ampere sensitivity and < 80 nm spatial resolution in local CV measurements.
  • Resolved nanometer-scale details of molecular organization in ferrocene self-assembled monolayers (SAMs).
  • Observed a 19% difference in packing density with minimal dispersion in molecular electrical properties.

Conclusions:

  • The developed technique opens new avenues for nano-electrochemistry.
  • Enables the study of quantum mechanical resonance in complex molecules.
  • Offers potential applications in electrochemical catalysis and biophysics.