Question

What minimum potential must a couple have to be able to oxidise water at ph 7?

Answer 1

Electrolysis of water is the decomposition of water into oxygen and hydrogen gas due to an electric current passed through the water. The reaction has a standard potential of −1.23 V, meaning it ideally requires a potential difference of 1.23 volts to split water.

This technique can be used to make hydrogen fuel (hydrogen gas) and breathable oxygen; though currently most industrial methods make hydrogen fuel from natural gas instead.