Voltammogram
Voltammogram - Related Videos
01:16
Voltammograms: Overview
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2024
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 A voltammogram's shape reflects the analyte's behavior during the redox process. In the presence of convection, such as stirring in hydrodynamic voltammetry, the plot forms a sigmoid shape, where the current...
08:37
Cyclic Voltammetry (CV)
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2023
Source: Laboratory of Dr. Kayla Green — Texas Christian University A Cyclic Voltammetry (CV) experiment involves the scan of a range of potential voltages while measuring current. In the CV experiment, the potential of an immersed, stationary electrode is scanned from a predetermined starting potential to a final value (called the switching potential) and then the reverse scan is obtained. This gives a 'cyclic' sweep of potentials and the current vs. potential curve derived from the data is...
05:03
Precise Electrochemical Sizing of Individual Electro-Inactive Particles
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Cited by 1 •
2023
As an analytical technique, nanoimpact electrochemistry, an increasingly important approach to counting and characterizing nanometer-scale, electro-inactive particles, suffers from poor precision due to the heterogeneous current distributions that arise from its use of ultramicroelectrodes. Outlined here is a generalized approach, termed "electrocatalytic interruption," that enhances precision in such measurements.
10:59
Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
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Cited by 1 •
2023
The protocol describes how to monitor electrochemical events on single nanoparticles using surface-enhanced Raman scattering spectroscopy and imaging.
05:28
Versatile Technique to Produce a Hierarchical Design in Nanoporous Gold
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2023
Nanoporous gold with a hierarchical and bimodal pore size distribution can be produced by combining electrochemical and chemical dealloying. The composition of the alloy can be monitored via EDS-SEM examination as the dealloying process advances. The material's loading capacity can be determined by studying protein adsorption onto the material.
FAQs
Peak position indicates the potential at which an electrochemical reaction becomes evident, helping researchers assess reaction potential and identify the substance involved. Peak magnitude provides information related to analyte concentration, so comparing signal sizes can support measurement. Considering both features is more informative than relying on either alone because a similar potential and current response together strengthen interpretation.
Background current provides the baseline against which reaction-related changes are judged, while peak shape supplies clues about the character of the electrochemical response. Interpreting these features together helps separate a meaningful oxidation or reduction signal from nonreaction current and can reveal that more than one chemical process contributes to the recorded trace.
Scan conditions influence how a voltammogram should be interpreted because the measured response reflects both electron-transfer kinetics and mass transport. Electron-transfer kinetics describe how readily charge moves during oxidation or reduction, whereas mass transport describes how electroactive material reaches the electrode. Examining the trace under stated conditions helps researchers assess reaction behavior rather than treating every peak as a simple concentration signal.
To generate a voltammogram, researchers place the electrochemical system under a controlled potential program, either sweeping the potential or applying steps. The potential is measured relative to a reference electrode, and the resulting current is recorded from the working electrode. The current-potential trace can then be examined for peaks, waves, background current, and peak shape.
An unknown electroactive compound can be investigated by comparing the potential position of its response with electrochemical behavior observed in the measurement. Once a reaction signal is assigned, its current magnitude can support concentration measurement. This makes the approach useful for both compound identification and quantitative analysis, provided the trace is interpreted with its background and shape.
These plots help researchers examine electrochemical performance in materials designed to catalyze reactions or store energy. Features such as reaction-related peaks, current magnitude, background current, and peak shape provide a way to characterize how the material responds under applied potential. The results can guide comparisons among materials and reveal electrochemical behavior relevant to catalysis or energy storage.
Researchers interpret the location and form of current features rather than viewing the trace as a single undifferentiated signal. Peak positions relate reactions to characteristic potentials, while peak shapes and background current help assess whether observed changes reflect distinct processes or nonreaction contributions. This combined reading supports mechanistic studies of electrochemical reactions and electron-transfer behavior.