How to interpret cyclic voltammetry?
Best insight from top research papers
Cyclic voltammetry is a valuable electrochemical technique that provides insights into redox potentials, diffusion coefficients, and charge transfer mechanisms. It involves measuring current as a function of voltage to understand various electrochemical properties. Interpretation of cyclic voltammograms involves analyzing peak currents, peak potentials, and the shape of voltammograms to determine diffusion and adsorption controls, as well as the nature of charge transfer mechanisms. Additionally, cyclic voltammetry can be used to study the influence of different compounds on oxidation mechanisms, as seen in the investigation of azole compounds on copper corrosion in chloride-containing solutions. Overall, cyclic voltammetry aids in understanding redox processes, reaction kinetics, and the behavior of electroactive species in different environments, making it a versatile tool in electroanalytical studies.
Answers from top 5 papers
More filters
| Papers (5) | Insight |
|---|---|
| Cyclic voltammetry interprets redox potentials and reaction mechanisms. It analyzes copper oxidation in chloride solutions with azole compounds, revealing passivation and diffusion-controlled processes. | |
| Interpret cyclic voltammetry by considering voltammogram shape, peak currents, peak potentials, diffusion and adsorption controls, electron numbers, electrode handling, AC impedance, and charge-transfer rates. | |
03 Apr 2023 | Cyclic voltammetry interprets redox potential, diffusion coefficients, and reaction mechanisms by measuring current vs. voltage, providing insights into energy storage materials and electrochemical processes. |
14 Citations | Interpret cyclic voltammetry by understanding the connection between reaction kinetics, potential drops across layers, and experimental variables like scan rate and redox potential for semiconductor electrodes. |
3 Citations | Cyclic voltammetry interprets selective ion transport in electrode-supported ion-exchange membranes by analyzing redox probe molecules, diffusion coefficients, and charge transport mechanisms within thin films. |
Related Questions
How to improve potential window determination via cyclic voltammetry?2 answersTo improve potential window determination via cyclic voltammetry, several techniques have been proposed. One approach involves using thermodynamic considerations and experimental probing of electrolyte and electrode material stability to define the safe potential window. Another method involves scan rate-dependent cyclic voltammetry, which considers various factors such as selecting a suitable measuring window, optimizing measuring settings, and extracting the desired information. Additionally, a new technique has been demonstrated that uses a background-corrected cyclic voltammetry approach to largely eliminate artifacts due to concentration cell and H2 crossover effects, resulting in more accurate determination of the potential window. These techniques provide quantitative approaches for monitoring the influence of the potential window on the dissipative behavior of electrochemical systems, allowing for improved determination of the viable potential range and enhanced understanding of kinetic and diffusion phenomena.
What different electrode materials are used in cyclic voltammetry?2 answersCyclic voltammetry uses different electrode materials for electrochemical measurements. One study used a miniaturized printed circuit board (PCB) with gold electrodes for the counter, working, and reference electrodes. Another study investigated the permselective properties of electrode-supported ion-exchange polymer films using carbon disk electrodes. Gold electrodes were also used to study the electrochemical response of glucose, uric acid, and cholesterol. Polyaniline (PANI) films were synthesized on stainless steel electrodes for supercapacitors. Additionally, a carbon paste electrode modified with MnO2 nanoparticles was used for the electro oxidation of manganese ions.
What factors affect potential window in cyclic voltammetry?3 answersThe potential window in cyclic voltammetry is affected by several factors. One factor is the scan rate, where a low scan rate can reduce the distortion of current-voltage and minimize artifacts due to concentration cell and H2 crossover effects. Another factor is the diffusion conditions and degrees of reversibility, which can influence the potential peak separation. Additionally, the selection of a suitable measuring window, optimization of measuring settings, and data acquisition can also impact the potential window. It is important to consider these factors in order to accurately determine the double layer capacitance and evaluate the electrocatalytic materials for energy conversion and storage applications. By following a seven-step method that includes these considerations, reliable determination of the double layer capacitance can be achieved.
Current density affects cyclic voltammetry how?5 answersCyclic voltammetry is a technique used to study electrochemical reactions. The current density affects cyclic voltammetry by influencing the mass transfer and electron transfer rates. High magnetic fields can enhance the limiting currents observed on cyclic voltammograms, leading to an increase in current density. The precision of peak potential measurements in cyclic voltammetry can be improved by using derivative techniques and correlating peak potential and peak current data, which allows for more accurate determination of current density. At very high scan rates, the diffusion layer and double layer in cyclic voltammograms become physically inseparable, resulting in distortions of the current density measurements. The differential charge curve obtained from galvanostatic cycling can provide insights into the current density dependence that may not be captured by cyclic voltammetry. By using affordable equipment, such as MicroLab data acquisition interfaces and screen-printed electrodes, cyclic voltammetry experiments can be made more accessible to undergraduate students, allowing them to explore the effects of current density.
How does cyclic voltammetry work?3 answersCyclic voltammetry is a versatile method for investigating and monitoring processes involving electron transfer. It can be used to characterize, synthesize, analyze, and study mechanisms of various compounds, including organic, inorganic, polymer, films, and semiconductors. The technique can be applied in both direct and indirect approaches and is considered an essential tool in research and development labs. Cyclic voltammetry can also be used to predict the oxidation process in heterogeneous catalysis by measuring the activity of suprafacial and intrafacial reactions. It is an attractive method for teaching electrochemistry concepts and is considered an "active" electrochemical method, where the experimenter drives the reaction by controlling circuit parameters. The technique can also be used to evaluate heterogeneous rate constants under intermediate diffusion conditions and determine diffusion coefficients of ions in electrolytes.
How are the peaks on cyclic voltammograms formed?2 answersThe peaks on cyclic voltammograms are formed due to various factors. One factor is the interaction of isolated adsorbates with the interfacial fields, which can cause peak shifts and alterations in peak shape. Another factor is the underlying mechanisms of the peak formation in different potential regions, which can be understood through site-specific models and kinetics simulations. Additionally, the dependence of the peaks on the square-root of potential scan rates and the solution resistance can be attributed to sluggish charge transfer rates and the negative capacitance associated with the redox reaction. Furthermore, the presence of anodic and cathodic peaks in cyclic voltammograms can be linked to the charging-discharging dynamics of deep level traps within the electrode system, which can be influenced by the use of certain materials and can be mitigated through doping. Overall, understanding the formation of peaks on cyclic voltammograms requires considering factors such as interfacial fields, kinetics, charge transfer rates, and the presence of deep level traps.