What is the optimum potential window for getting the proper CV response of IrO2 vs Hg/HgO electrode in 0.1 M NaOH solution?

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Yurii V Geletii

Use your working electrode and measure it!

Thangaian Kesavan

First you check and optimise.. Even you can use SCE as reference elctrode.

otherwise you can try with neutral electrolytes like Na2SO4, Ca(NO)3 and so on....first you fix the potential window 0 to 1 V vs SCE and run CV then optimise...

Hans-Joachim Kohnke

Dear Anantharaj

The electrochemical Potential of Hg/HgO in alkaline Solution is about +910mV compared to the reversible Hydrogen Potential (RHE).

Ir/IrO2 is almost the same potential +920mV in comparision to RHE.

Therefore you should measure 0V between IrO2 and Hg/HgO.

For detailed potentials please look into the Pourbaix-Diagramms.

At electrolysis conditions you will get of course a more positive difference due to the formulation of different radicals and O2. Should be in the range of 400 to 600mV depending of temperature ...

Best regards

Hans

Anantharaj Sengeni

Thank you so much Hans!