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Videos de Conceptos Relacionados

Voltammetry: Overview01:20

Voltammetry: Overview

Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
A voltammetric cell uses three electrodes: a working electrode, a reference electrode, and an auxiliary electrode. The redox reactions occur in the working...
Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

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...
Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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 the...
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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 ensures...
Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes
08:32

Electrochemical Roughening of Thin-Film Platinum Macro and Microelectrodes

Published on: June 30, 2019

Voltametría con electrodos microscópicos en nuevos dominios.

R M Wightman

    Science (New York, N.Y.)
    |April 22, 1988
    PubMed
    Resumen

    Los microelectrodos ultramíricos permiten mediciones electroquímicas con alta resolución temporal y espacial, incluso en soluciones resistentes difíciles. Estos electrodos microscópicos superan las limitaciones de las técnicas convencionales para el análisis químico preciso.

    Área de la Ciencia:

    • La electroquímica es electroquímica.
    • Química Analítica La Química Analítica es la
    • Ciencia de los materiales Ciencia de los materiales.

    Sus antecedentes:

    • Las técnicas electroquímicas convencionales se enfrentan a limitaciones en resolución y aplicabilidad.
    • Los electrodos microscópicos ofrecen potencial para el análisis electroquímico avanzado.

    Objetivo del estudio:

    • Introducir y resaltar las capacidades de los ultramicroelectrodos.
    • Demostrar su utilidad para superar las limitaciones de los métodos electroquímicos tradicionales.

    Principales métodos:

    • Utilizando ultramicroelectrodos voltamétricos.
    • Realización de mediciones electroquímicas en escalas de tiempo de microsegundos.
    • Alcanzando una resolución espacial de micrómetros.

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    Published on: June 30, 2019

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    Principales resultados:

    • Factibilidad demostrada de mediciones en soluciones de alta resistencia.
    • Se logró una alta resolución temporal (microsegundos).
    • Se logró una alta resolución espacial (en micrómetros).

    Conclusiones:

    • Los microelectrodos ultramíricos proporcionan ventajas únicas para las mediciones electroquímicas.
    • Permiten un análisis preciso donde los métodos convencionales fallan.
    • Su aplicación se extiende a entornos desafiantes y resoluciones exigentes.