Hydrogen Power: Separating Gas from Salt Water for Energy

Thread starter WCOLtd
Start date Mar 22, 2009
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Hydrogen Power

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SUMMARY

The discussion focuses on the extraction of hydrogen gas from salt water through electrolysis, detailing the energy requirements and efficiency. The bond energy of water is established at 918 kJ/mol, translating to 51 kJ/g. With electrolysis efficiency at 75%, approximately 68 kJ/g is necessary to produce hydrogen. Consequently, to generate one kilowatt-hour (kWh) of energy, 529 grams of hydrogen can be separated from salt water per hour.

PREREQUISITES

Understanding of electrolysis and its efficiency metrics
Familiarity with bond energy concepts
Knowledge of energy conversion units (kJ to kWh)
Basic principles of hydrogen production methods

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Energy researchers, environmental scientists, engineers in renewable energy sectors, and anyone interested in hydrogen production technologies.

Mar 22, 2009

WCOLtd

How much hydrogen gas can be separated from salt water for every kilowatt/hr of energy? Rough approximations are fine.

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Mar 22, 2009

anarchospider

And how to collect the hydrogen?

Mar 22, 2009

russ_watters

Mentor

Insights Author

Well, the bond energy of water is 918 kJ/mol or 51 kJ/g. If electrolysis is typically 75% efficient, you'd need 68 kJ/g. A kWh is 3.6MJ, so that's 529 g/hr.