What is the required potential for water oxidation?

Water oxidation reaction is as follows: 2H2O = O2 + 4e- + 4H+ and standard reduction potential for the O2/H2O couple is 1.23 V (vs NHE). Therefore what exact potential (-1.23V or +1.23 V) we need...

18 March 2016 2,085 6 View