Iwikefactz Posted March 16, 2016 Share Posted March 16, 2016 What exactly is exchange current density when it comes to electrocatalysts? Is it favorable in electrocatalysis? Link to comment Share on other sites More sharing options...
fiveworlds Posted March 16, 2016 Share Posted March 16, 2016 (edited) The exchange current is the current at equilibrium, i.e. the rate at which oxidized and reduced species transfer electrons with the electrode. In other words, the exchange current density is the rate of reaction at the reversible potential (when the overpotential is zero by definition). https://en.wikipedia.org/wiki/Tafel_equation when it comes to electrocatalysts Well if adding an electrocatalyst changes the reaction rate then logically adding/removing an electrocatalyst must change the exchange current density. Edited March 16, 2016 by fiveworlds 1 Link to comment Share on other sites More sharing options...
Iwikefactz Posted March 16, 2016 Author Share Posted March 16, 2016 So this means a higher one is more favourable? Link to comment Share on other sites More sharing options...
fiveworlds Posted March 16, 2016 Share Posted March 16, 2016 So this means a higher one is more favourable? No it isn't because there is no current at exchange current density. It is merely a description of a chemical reaction rates happening at equilibrium. Link to comment Share on other sites More sharing options...
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