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Related Concept Videos

Voltammetry: Overview01:20

Voltammetry: Overview

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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...
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Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

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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...
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Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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Voltammetry: Factors Affecting Measurements01:21

Voltammetry: Factors Affecting Measurements

702
A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
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Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

2.0K
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...
2.0K
Voltammograms: Overview01:16

Voltammograms: Overview

840
Voltammograms are current plots as a function of applied potential, offering insights into electrochemical systems. The shape of a voltammogram depends on how the current is measured and whether convection (heat transfer by fluid movement) is present or absent.
Shapes of Voltammograms
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Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
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Voltammetric pH Nanosensor.

Magdalena Michalak1, Malgorzata Kurel1, Justyna Jedraszko1

  • 1Institute of Physical Chemistry, Polish Academy of Sciences , Kasprzaka 44/52, PL-01224 Warsaw, Poland.

Analytical Chemistry
|October 31, 2015
PubMed
Summary

A new voltammetric nanosensor enables precise nanoscale pH measurement across a wide range (pH 2-12). This advancement is crucial for studying interfacial phenomena and intracellular processes where optical methods fail.

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Area of Science:

  • Electrochemistry
  • Nanotechnology
  • Surface Science

Background:

  • Accurate nanoscale pH evaluation is critical for understanding interfacial processes like catalysis and corrosion.
  • Optical methods are often unsuitable for opaque systems, and potentiometric probes have limitations.
  • Existing methods lack the spatial resolution and reliability needed for microscale environments.

Purpose of the Study:

  • To develop a reliable voltammetric nanosensor for high-resolution nanoscale pH assessment.
  • To overcome the limitations of existing pH measurement techniques in challenging environments.
  • To demonstrate the sensor's capability in mapping pH distributions using scanning electrochemical microscopy.

Main Methods:

  • Fabrication of a pyrolytic carbon nanoelectrode via chemical vapor deposition (CVD) within a quartz nanopipette.
  • Modification of the nanoelectrode surface with syringaldazine.
  • Utilizing the nanosensor as a probe in scanning electrochemical microscopy (SECM).

Main Results:

  • The nanosensor demonstrated stable, quasi-reversible cyclic voltammetry with a near-Nernstian pH dependency (-54 mV/pH).
  • Reliable pH assessment was achieved across a broad range from pH 2 to 12.
  • SECM mapping revealed localized alkalization near an oxygen-reducing electrode, indicating buffer limitations.

Conclusions:

  • The developed voltammetric nanosensor offers a robust solution for nanoscale pH determination.
  • The sensor's high spatial resolution is valuable for studying microenvironments and interfacial reactions.
  • The findings highlight the importance of considering buffer capacity in electrochemical studies.