In this case, the following half reactions take place, and hydrogen gas is produced at the cathode and oxygen gas at the anode.
12.
The standard electrode potential for this compound is + 2.51 V with a half reaction generating the hydrogen sulfate ( pH = 0 ).
13.
Since neither half reaction will occur independently of the other, the two half cells must be connected in a way that will allow ions to move freely between them.
14.
The process is split up into two half reactions, run in sequence and repeated for each layer, in order to ensure total layer saturation before beginning the next layer.
15.
Of the two half reactions, the oxidation step is the most demanding because it requires the coupling of 4 electron and proton transfers and the formation of an oxygen-oxygen bond.
16.
For oxidation-reduction reactions in acidic conditions, after balancing the atoms and oxidation numbers, one will need to add H + ions to balance the hydrogen ions in the half reaction.
17.
The half reactions are given on that page ( I see I've been beaten . . . must still post ) talk ) 23 : 29, 29 April 2010 ( UTC)
18.
At equilibrium the potential for the two half-reactions must be equal to each other and, of course, the number of electrons exchanged must be the same in the two half reactions.
19.
However, there are known materials that can mediate the reduction step efficiently therefore much of the current research is aimed at the oxidation half reaction also known as the Oxygen Evolution Reaction ( OER ).
20.
For the case of a metal-metal half electrode, letting M represent the metal and " z " be its valency, the half reaction takes the form of a reduction reaction:
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