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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
After my first bad attemps with electrolysis, i made one finnaly worth trying to make good. The electrodes are 4 sheets of 1.5in by 5 in metal ( not sure wht type, but i think its galvanized steel). The electrolyte is sodium hydroxide, so now the resistance is only 1 ohm. It works well with battery's and wall-warts, but i want to use a laptop power supply. It can provide 16v at 4.5A. Its not working, but today i found it has somekind of fail-safe feature. After a short-circuit, power is cut off for a while. Is there somway to make a driver to pull current, but have it al put into the electrolysis? Would pulsing the input power work, as to reset it at ever off?
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
You need low voltage and high currents to get any useful efficiency. at 16V you need to have several separate cells in series or make a DC-DC converter.
Registered Member #63
Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
rp181 wrote ...
After my first bad attemps with electrolysis, i made one finnaly worth trying to make good. The electrodes are 4 sheets of 1.5in by 5 in metal ( not sure wht type, but i think its galvanized steel). The electrolyte is sodium hydroxide, so now the resistance is only 1 ohm. It works well with battery's and wall-warts, but i want to use a laptop power supply. It can provide 16v at 4.5A. Its not working, but today i found it has somekind of fail-safe feature. After a short-circuit, power is cut off for a while. Is there somway to make a driver to pull current, but have it al put into the electrolysis? Would pulsing the input power work, as to reset it at ever off?
Thanks in advance.
Well, the issue at hand is that you're presenting a 1-ohm load across a laptop power supply which is expecting no less than perhaps a 4-ohm load. So you need to get three ohms from somewhere, my friend! Can you build another three cells?
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Electrolysis really needs to be driven from a controlled current source, not a controlled voltage. The cell looks like a battery, with a voltage dependant on the material over voltage, plus a highly variable additional polarisation, plus a series ressiitance which varies with temperature and concentration. That is, it ain't constant, and can be very low slope resistance (rate of change of current with change of voltage) despite a relatively high voltage. At any given time you might find a voltage to get a reasonable current through it, but it can quickly change with changing conditions.
About the simplest, but not terribly efficient, is to use a low voltage transformer + rectifier to give about twice the output voltage needed for the cell, but then put a lamp load in series, either the primary or the secondary, which then controls the current. A 24v lamp in series with the output of your PSU would work, but be extremely inefficient.
If you're stuck with 16v being your only power source, then several cells in series will give you more voltage to work into. I use lead electrodes in sulphuric for my cells, overvoltage is a little higher than platinum, but the electrodes are cheaper. If you can't get zero reaction at your electrodes, then at least get a tried-and-tested non-electrode-rotting reaction. Mixed metals (steel + inc) sounds like a guarrantee of electrode rot.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
The NaOH does alot to protect the electrodes. I Am doing this for a project, so i can't add another cell as to keep this constant. Ile try the lamp, and if all else fails ile stick with battery. I need to research a lil more about controlled current circuits.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
Well i tried a couple bulbs on hand. A 12v 10w halogen improved preformance aton. I tried a 130v 65w bulb in series with the cell. I then decided To put it in parrallel with the cell. When i connect it, it glows orange inside the bottle, vibrates aton, and spews out steam. Heres a video:
did it outside as liquid came out.
I was looking at some videos, it looked like this but they called it cold fusion. I think it is just arcing inside, so the hydrogen and oxygen combust.
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electrolysis driver
