WATER ELECTROLYSIS

(Article From : http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/electrol.html

and From : http://www.nmsea.org/Curriculum/7_12/electrolysis/electrolysis.htm)

The electrolysis is a process convert water H2O to hydrogen gas H2 and oxygen gas O2. The electrolysis of one mole of water produces a mole of hydrogen gas and a half-mole of oxygen gas in their normal diatomic forms.

it about twice as much hydrogen as oxygen.

By using electricity, it can splitting water to hydrogen and oxygen. At the cathode (the negative electrode), there is a negative charge created by the battery. At the anode (the positive electrode), there is a positive charge, so that electrode would like to absorb electrons.

How the splitting process happen:-

energy (electricity) + 2 H₂O ---  O₂  + 2 H₂

Before completely forming hydrogen and oxygen gases:-

H₂O --- H⁺ + OH^-

Then:-

Hydrogen

H⁺ + e^- --- H      then    H + H --- H₂

Oxygen 

 4 OH^- --- O₂ + 2 H₂O + 4e^-