I connected the corrosion cell with workstation. The voltage values started fluctuating when connected with corrosion cell before OCP. The values in the voltage relies within in a stable range before running nay electrochemical experiment. In this case the values started fluctuating very abnormally. Is it this shows erratic connection?
The potentiodynamic polarization technique is destructive, this means that in time you will have corrosion products in your electrolyte. If you want to perform the same test, use a new electrolyte each time, without corrosion products, which generally make the electrolyte more aggressive.
when you try to find OCP...then electrode cell and reference electrode cell are balanced by potentiostate...but due to non uniformity in-term of structure, composition or activation working electrode potential fluctuates and that is visible on graph...hence set of observation taken over long duration with stabilized value.
If your sample has low stability...then its difficult to get stable OCP...but longer duration and stable temperature and pressure condition will give you needed OCP....increase the ocp time....more and more...best of luck
Hi Sajna Ss ,
Troubleshooting is always challenging and usually requires trying a few different options to identify the issue(s) and rule out what is not the issue(s). It is also difficult to recommend solutions to correct the issue remotely without knowing more about your setup, but I'd recommend trying some preliminary items.
In the video you showed, the voltage was fluctuating between -1.5 V to +1.0 V, which is incredible high. I am wondering if you have a connection issue someone in your circuit or if one of your components of your electrochemical cell is damaged. Here are some preliminary troubleshooting items to help you get started:
(1) Some questions: What is your working electrode material? What is your working electrode assembly? What is your reference electrode? Are you using a Luggin probe? You should try to isolate each component to ensure each is working.
(2) If you have a Dummy cell (that came with your potentiostat), I would run that to rule out any Potentiostat issues. You can also run a linear DC potentiodynamic scan using a resistor. For example:
https://www.ameteksi.com/-/media/ameteksi/download_links/documentations/supportcenter/princetonappliedresearch/howtoguides/performing_an_external_dummy_cell_checkout_test.pdf?revision=00f1dc1a-01ab-48b3-953c-e355ba8250c6
Also, for example:
https://www.electrochem.org/ecsnews/understanding-and-validating-potentiostat-dc-accuracy/
(3) Next, I would check to ensure electrical continuity between all components. For example, using a multimeter you can check the electrical continuity between the sample surface and the connection point.
(4) To test the reference electrode (and Luggin probe), I would run / repeat a previous experiment where you know everything was working.
Alternatively you can also check the impedance of the reference electrode to ensure no blockages in the frit, etc.
For example:
https://www.gamry.com/application-notes/instrumentation/measuring-the-impedance-of-your-reference-electrode/
Also for example:
https://www.gamry.com/support-2/technical-support/frequently-asked-questions/reference-electrode-care-overview/#:~:text=Checking%20the%20Impedance%20of%20the%20Reference%20Electrode&text=The%20impedance%20of%20your%20Reference,unacceptable%20and%20must%20be%20corrected.
(5) If everything above checks out as ok, then another good option is to run ASTM G5 using the correct material to assess your electrochemical cell.
If everything above works out then you may have an issue with your specific sample and/or working electrode assembly, but it is difficult to know prior to ruling some items out, and learning more about your electrochemical cell and materials.
Good luck in your troubleshooting!
Cheers,
Leo
From the scattering of your results, I would say that you are not measuring anything. Maybe there is an air bubble in your reference electrode or a bad connection to the working or to the reference electrode.
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