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Electrolysis of Seawater under pressure

by jayron11
Tags: electrolysis, pressure, seawater
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Dec10-09, 08:30 AM
P: 1
I have perused a number of related posts, but have not found the answer I'm looking for.

My problem is this:

I need to electrolyze seawater and capture the gas at a given pressure (I'm mixing the O2 and H2).

It seems to me that there should be a relationship of the form:

dVolume (or dMoles) ~ Pressure, temperature, voltage, conductivity

Some have indicated that pressure has no effect on the electrolysis of water, but this makes no sense to me - at a minimum, the gas will return to solution in the water under pressure and not be useful.

Any information would be greatly appreciated. Thanks a lot...
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Bob S
Dec10-09, 10:34 AM
P: 4,663
Sounds interesting. You should also measure the number of Coulombs (as well as Joule energy) per Mol of H2 to determine efficiency. It should be (I think) about 192,900 Coulombs per Mol H2 (~2 grams, 22.41 liters at STP), not including inefficiencies. This may be pressure and temperature dependent.
Bob S

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