I have a cyclic voltammetric of PtC. I want to obtain the processes of adsorption of hydrogen and then compare it with other materials. I read this is possible with the Tafel slope. But I don't know if I can obtain the value of the Tafel slope in the region marked (Figure).
I was reading the Tafel slope is obtained in potential when the coverage is complete or coverage is empty (θ=1 or θ=0). Furthermore, I think in the marked region its only Volmer step. Can you tell me if it's correct?
Dear C. R Santiago-Ramirez.
As to your quastion on the applicability of Tafel equation.
I sent the reply, but I’m not sure it was properly delivered within RG-formate.
Therefore, below I send it once again. To get inside e/chem processes and see the essentials of Tafel equation validity and applicability I refer to the below-listed two papers:
1. V. Dimitrov, L. Gorker: Modified Nernst equation for electroless metal deposition. Progress in Reaction Kinetics and Mechanism 01/2006, volume 31(4):pp.45-58.
2. Lev Gorker, Vasili Dimitrov: Modified Tafel Equation for Electroless Metal Deposition. Progress in Reaction Kinetics and Mechanism 06/2009, 34(2):127-140. DOI: 10.3184/146867809X452596.
If still you have any issue –don’t hesitate to be in contact.
Best regards.
Professor V. Dimitrov
Dear C. R. Santiago Ramirez
Attached you will find a recent paper which covers the hydrogen oxidation reaction (HOR) in alkaline medium. You might read information regarding the reaction mechanism (note that the HER is the opposite HOR reaction).
If you have more questions, you can write me (si quieres en español).
Best
Carlos.