Electrolysis of Seawater under pressure

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SUMMARY

The discussion centers on the electrolysis of seawater under pressure, specifically the relationship between pressure, temperature, voltage, and conductivity in gas capture. Users emphasize the importance of measuring the number of Coulombs and Joule energy per mole of hydrogen (H2) to assess efficiency, noting that approximately 192,900 Coulombs are required per mole of H2 at standard temperature and pressure (STP). The conversation challenges the notion that pressure has no effect on electrolysis, highlighting the necessity of preventing gas from returning to solution under pressure.

PREREQUISITES
  • Understanding of electrolysis principles
  • Familiarity with seawater chemistry
  • Knowledge of gas solubility under pressure
  • Basic calculations involving Coulombs and Joules
NEXT STEPS
  • Research the effects of pressure on gas solubility in liquids
  • Study the electrolysis process of seawater specifically
  • Learn about measuring efficiency in electrolysis, focusing on Coulombs per mole
  • Explore the relationship between temperature and electrolysis efficiency
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Researchers in electrochemistry, engineers working on hydrogen production, and anyone involved in renewable energy solutions utilizing seawater electrolysis.

jayron11
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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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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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