Dear All,
I prepare trimetallic Pd-based catalysts supported on carbon and apply them as electrocatalysts for ethanol electrooxidation which is my main target.
Yet, an idea occurred to me that those materials might be suitable as ORR electrocatalysts as well and I am unaware of it.
That is why I have tried one sample (comprised of Pd, Ni, and Ag on C) for ORR. The cyclic voltammetry graph is attached and was performed in 1M KOH at 50 mV/s. I have no experience at all with the ORR reaction kinetics. That is why I am sharing the result with you and hope for some advice about it. What are the ORR steps vs applied potential? Is the pH (14) suitable or not? What are the peaks that could be seen in the graph? I did not saturate the KOH with oxygen, what is the implication of that?
Thanks for your kind attention.
Dear Dr Ahmed please check the attached one
Hopefully it could help you
Dear Ahmed, You need to find some literature where it is explained in more complex way. Here I can just answer your question what is seen in your plot. First top feature is oxidation of catalyst. Then in the slope is oxygen evolution and the feature below is reduction of catalyst surface. Basically, oxygen reduction is not the same as oxidation. Because Pd in your catalyst is presented I can roughly say that it will be active as it is seen also in your plot.
I agree with Roman Fiala ,
The peaks you can see in your CV is surface oxidation and reduction of used metals. 1 M KOH is not bed electrolyte due good conductivity and corrosion stability of many metals (that is why many water based batteries works in alkaline solutions). For the ORR you must introduce oxygen in the cell, but without using rotation disk electrode, current will be very small. Expect ORR at the potentials below 0.2 V.
Gretings
prof. Grgur
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