Does Tafel slope determination from LSV polarization curve is right? As LSV is a potential dynamic phenomenon while the assumption for Tafel equation are potentiostatic. Can anyone guide me in this regard.
Dear Noureen Khan ,
To be sure that you are estimating correctly HER/OER Tafel slopes, you need to perform steady state chronoamperometric measurements; For each potential you should get a steady-state current (For each applied E(i), you measure Istat(i)).
Once you have all the data, you will notice the linear slope that you are looking for (within a limitted range of potential).
Another way to do it, is to use a very slow scan rate (1 mV/s or less 0.1mV/s and sometmes lower than that, depending on your system).
PS:
1) A linear doamin is not always easy to identify (case of magnesium for example, no identifiable slopes are present when performing such measures because of the complexity of the mechanism and the elementary reaction steps).
2) And usually this kind of tests takes long duration for the steady state to be established.
Hope It helps.
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