I am doing electrochemical cleaning of bare gold electrode with weak sulfuric acid. Unfortunately, I obtained voltammograms which are very different from that found in literatures. Kindly see attached file for the image of the voltammograms.
The waviness suggests there is an unwanted input signal from the potentiostat; that is unlikely to be caused by an electrochemical phenomena. Try troubleshooting your equipment, starting with parameters entered into software. If you can't get support from the supplier of the equipment, try uploading screenshots of what you've entered to conduct this measurement.
Thank you for the information, Ms. Anne. I highly appreciate it. Kindly see attached file for the screenshot of the parameters entered.
That's interesting - I hadn't heard of Rodeostat before. Since it's open-source, unfortunately there isn't much support, except from the user community; have you looked for one online? It shows that you can graph the potential vs time of the voltammetry, which might help diagnose whether your input voltage for the measurement is correct. If the device's output voltage looks like a zigzag at the correct potentials, then you could narrow the problem to the signal received from your cell.
There is so much variation between your results, and the only clear problem I can see is that the last two graphs are limited by your selected current range (100uA). If you increase this current range, the last graph might have looked closer to what you want. If you didn't actually change anything between these three tests, then it could also be a hardware connection issue - this is difficult to do remotely.
Dear Glenn Ongayo ,
you might come up with potentiostat's compliance issues.
Specifically, you might turned up near to (constraints issues[1] due to the maximum) potentiostat's (Power or/and i-current) compliance (see the specs), apart the small potential region (newplot.png).
An advice about the cell: Try to avoid (P or/and i-)overloading[1] by reducing (minimize) the submerging part of the WE[2,3] into the electrolyte. After cell's troubleshooting, try to remeasure.
1. https://www.researchgate.net/post/In_Gamry_potentiostat_a_problem_of_I-overload_and_CA-overload
2. You can try to reduce the active WE-surface[2].
3. You might wish, either to: a)lower the electrolyte's volume (height level), or even b)raise/elevate, temporarily, the WE, of you cell.
I have been experiencing this kind of signal trouble. In my case, I changed the step potential for another different on the Autolab program and the input has disappeared. I hope you have success!
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