Is it correct to check the overpotential with CV because the LSV test of the electrode based on nickel foam is inaccurately tested by NiOOH, which is generated? And how do you measure that?
Any type of sweeping voltammatry, CV or LSV, only give you a finger print of process that might take place. These techniques are not great as you are changing two parameters at the same time, potential, and time.
What are you trying to actually measure? OER? If so, use potential steps instead where each step is longer than say 60s. That way, the system have reached a quasi steady state, and you can the real OER current.
However, If you are interested in adsoption process, CVs at different scan rates can be preferable. If you are intersted in coverage of hydroxides, I would recommend using stripping voltammetry. See
Article Establishing the potential dependent equilibrium oxide cover...
Enjoy
Gustav
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