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Isn't this a practical term for the difference between the thermodynamically derived PD and the PD required for useful current to flow in a real world electrolytic cell. It therefore is a summation of all of the other types of overpotential involved- e.g. reaction OP, concentration OP etc.--[[User:Axiosaurus|Axiosaurus]] ([[User talk:Axiosaurus|talk]]) 10:05, 23 February 2009 (UTC)
I think their has been some confusion in the table of activation overpotentials - it would be good to define the temperature, electrolyte and current density (typically 1 mA/cm²). I think the value for Fe look more like the Tafel slope (0.15 V) than the overpotential (usually closer to 0.5 V)? [[Special:Contributions/81.223.140.162|81.223.140.162]] ([[User talk:81.223.140.162|talk]]) 15:00, 8 August 2011 (UTC)
== Electron transfer overpotential, Diffusion overpotential and back e.mf ? ==
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