CV redox peaks and Gamry Potentiometer

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SUMMARY

The discussion centers on the use of the Gamry Potentiometer for cyclic voltammetry (CV) measurements to analyze redox peaks in TiO2-deposited FTO/glass electrodes using LiClO4-PC aqueous solution as an electrolyte. Key findings indicate that potential differences equal to or below 1V may not yield oxidation or reduction peaks, while a sweep from -2V to 2V provides better results. The user also inquires about the possibility of simulating Chronoamperometry measurements using existing CV data in Echem Analyst, and expresses concerns regarding the lack of visible color change in TiO2 during Li+ intercalation, suggesting potential issues with reaction kinetics.

PREREQUISITES
  • Understanding of cyclic voltammetry (CV) techniques
  • Familiarity with Gamry Potentiometer and Echem Analyst software
  • Knowledge of redox reactions and electrochemical kinetics
  • Experience with TiO2 and its properties in electrochemical applications
NEXT STEPS
  • Research the interpretation of CV curves in electrochemical systems
  • Explore the integration methods for calculating charge (Qa and Qc) in Gamry
  • Investigate the effects of scan rate on current and charge insertion
  • Learn about the limitations of working electrodes in CV measurements
USEFUL FOR

Electrochemists, materials scientists, and researchers involved in battery technology or energy storage systems, particularly those working with TiO2 electrodes and cyclic voltammetry analysis.

erbilsilik
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I'm using Gamry Potentiometer for taking CV measurements for finding the appropriate voltage values for oxidation/reduction peaks and Echem Analyst for analyzing. CV measurements has performed on liquid electrolyte in order to find if working electrode accept Li ions. My question is about interpreting the results.

How can I interpret if potential difference equal or below 1V has no oxidation or reduction peak (or has only one of them) while potential sweep between -2V to 2V bring good results but if I change it to 1 to -3 no reduction peak again. Moreover, going to negative values has a bad consequences such broke the working electrode. What does it mean going to negative values?

That was my first question, my second question is: Is it possible perform Chronoamperometry measurements (in other word, simulate) by using existing CV measurements via Echem analyst script editor?
 
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UPDATE TO MY FIRST POST.
---------------------------------------------

My working electrode is TiO2-Deposited FTO/Glass (thin film). I use LiClO4-PC aqueous solution as an electrolyte. The method is discussed in several papers (doi: 10.1016/0167-2738(86)90214-6). Upon Li+ intercalation due to change in structure TiO2 expected to change a color (from a transparent to grey). However, there is no discernible change in the color that can human eye recognize in my analysis. As a result, I have doubt about the reactions kinetics. So my questions are, as follows.

1) Does seeing a peak in CV curve guarantees that some redox reactions is happening?
2) I've attached a picture of CV curves for various scan rates. Do you agree that it is a quasi reversible system (also discussed in here:https://www.researchgate.net/post/How_to_interpret_CV_redox_peaks_and_is_it_possible_run_a_Chronoamperometry_simulation_from_existing_CV_data ) http://imgur.com/a/hFczu
3) Since current is proportional to scan rate what is the correct way to calculate inserted charges (Qa and Qc -> Integration in Gamry)

4) After a lot of try, I found going to further from -1.7V broke my working electrode. And also, going to away from +1.9V. Can I consider this, as my limitations?

5) What does max current means in CV measurement? Does changing the value effects the shape of the curve?
 
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