i have Gamry interface 1000 workstation. How i can check Ag/AgCl reference electrode working properly or not. i have only one Ag/AgCl reference electrode.
Hi, you can take specific metals and let them corrode for a while in a specific electrolyte. Measure the potential with a functioning reference electrode and take the potential of the corroding metal as a reference for the future to check your reference. Active corrosion potentials of steel or zink (without any protecting layers) are pretty stable, e.g. -650 mV for unalloyed steel sheets in neutral solution (tap water) after some minutes.
Or just buy another ref ;-)
Best regards,
Andreas
Dear Sachin Kumar
You can calibrate your Ag/AgCl reference with standard electrode.
Deep a Pt foil-electrode and your Ag/AgCl reference electrode in a 1.0 M H+ concentration acid solution, then bubble H2 gas near Pt foil-electrode, wait for sometimes. Measure the potential difference between Pt electrode and Ag/AgCl using a multimeter. If the value is close to ~+0.2 V (SHE) then your reference electrode is fine.
Best Regards,
Bapi
Run the OCP test on Gamry for your reference electrode and a known good one (commercial may be, but of the same type) and measure the OCP, look at its stability. The OCP value should be less than 20 mV (ideally it should be zero), which is pretty normal for most electrochemical exp using Ag/AgCl electrodes. This method worked well for my projects, and its an easy check. If you have a different control electrode then look up the potentials against hydrogen electrode and calculate the difference accordingly. Or you can recheck using a different approach by setting up a 2 electrode cell with a known mixture of potassium ferro/ferricyanide. Read this article : https://pineresearch.com/shop/kb/software/methods-and-techniques/basic-methods/open-circuit-potential-ocp/
For answer your question, I posted my presentation to ECG-COMON 2012 on research gate. Hopefully it will be helpful for you.
Hi,
I agree with Dr. Kumar's response, eventhough, from practical point of view, it is not done for everyone ( Implementation of SHE and compare it to your ref-electrode). If available, it would be easier and better to try another operating electrode such as SCE or SSE and compare it to yours (respectively about + 0.24 / + 0.67V / 0.2V). Good luck
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