science forum beginner
Joined: 27 Jun 2006
|Posted: Tue Jun 27, 2006 7:31 pm Post subject:
Discarge process of dioxigen on metal surface
In the fuel cells H2/air, methanol/air, Zn/air etc., the air is
fluxed at the negative electrode to allow the discharge of
dioxygen. In order to obtain high current density, appropriate
catalyst (for example Cobalt-porphyrin on carbon and noble
metal) are involved to obtain high current density.
In fact, the rate of discharge of dioxygen on the surface of
a generic metal is, generally, slow.
My questions are:
1- What are the elementary semi-reactions that taken part in the
complete reduction process of dioxygen on the generic metal
2-What of these estabilisches the limiting step?