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1. Tafel slopes require the units of mV/decade if the decadic Tafel slope is what is meant. Without this the slopes are ambiguous since the lack of decade means per unit value of e.
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2. Can you estimate the thickness and uniformity of the native oxide layer?  From the EIS data, the impedance of the oxide layer is rather high for the LT 25P compared to the other samples.  Why?  It appears that if there is an oxide layer, it is not very stable in the chloride environment.  The authors mention thinning of the oxide layer...Does the oxide layer really become thinner?
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