# What exactly is the “oxygen reduction reaction”?

Is it

$\ce{O2(g) + 4H^+(aq) + 4e^- \rightarrow 2H_2O(l)}$

and are there multiple types of ORR?

See here for context: http://www.nature.com/srep/2014/140122/srep03821/full/srep03821.html

• Your reaction is perfect. – Freddy Jun 13 '14 at 7:06

According to your cited paper the reaction they care most about is $$\ce{O2 + 4H+ + 4e- -> 2H2O}$$ as you are suggesting. This should also be the total reaction and the most interesting one for applications, e.g. in fuel cells.