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Pure sodium hydroxide electrolyte with nickel electrodes is a good plan for pure hydrogen, the electrodes won't degrade much and the combination has a low overpotential.
Carbon has issues. Erosion is more rapid with chloride and in alkaline conditions.
Hydrogen is unfriendly. Compressed hydrogen is a nightmare. You will need detectors for oxygen in hydrogen and hydrogen in air. You will need to design the environment with the assumption that the tank will rupture at some point and any building into which hydrogen could leak will eventually have a mix explode.
Your units for density should be kilograms per cubic meter, not grams.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Would sodium bicarbonate and water work as the electrolyte, using nickel, would carbon be ok with that mix? I was planning on putting the two H/O tanks underground with a pipe high in the air connected to a storage tank with water in it which is connected to a H pipe setup below ground connected to the H/O tanks,with the water height for the pressure, not sure of the height to pressure thought.
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Flaming prop tips at 6000 rpm would look so cool! hydrogen flame is almost colorless I think. I was thinking about the thermodynamic efficiency comparing jet motor power to electric motor powered by same number of moles of H2.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
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radiotech wrote ...
Flaming prop tips at 6000 rpm would look so cool! hydrogen flame is almost colorless I think. I was thinking about the thermodynamic efficiency comparing jet motor power to electric motor powered by same number of moles of H2.
thats true, ill have to add some strontium salt....
Sodium bicarbonate is not ideal. Offhand I'd think low solubility, carbon dioxide will probably be evolved with the oxygen and carbon monoxide might be evolved with the hydrogen.
Your system Andy that links both tanks to a head of water has failure modes that could result in one gas being forced into the other tank. Two separate header tanks would be safer. Being underground adds corrosion issues and the materials will need to be compatible with hydrogen to prevent embrittlement problems.
Registered Member #4266
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Thanks, could you draw a picture of what you mean? I'm getting some MMO Titanium electrodes, for another project, what would be a good electrolyte or salt that wouldn't give off other gas?Copper hydroxide? would sodium hydroxide eat away at the Ti metal?
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Purifying hydrogen gas from electrolysis for fuel cell
