Hi,
Since Ravi mentioned about using high voltage potential for electrolysis, I took out my old Bedini monopole motor for testing last week. The cell made from 304 SS with 6" x 6" plate. Circuit is from Bedini monopole SSG (search in google).
Coil bifilar wound (850 turns) with 0.50mm and 0.65mm copper magnet wire. I replaced recovery battery in the circuit with cell. The base resistor is set at 680 ohm.
Collector -> 1N4007 -> cell anode -> cell cathode -> battery positive.
Use only tap water as electrolyte. The circuit draws 0.36A with tiny bubbles with 680 ohm as base resistor. Increase the base resistor above 2K, the amps draw goes down to 0.16A but not much bubbles flows out from the plates so I set the base resistor at 680 ohm.
During initial stage, I got to change water twice a day because of brown scum. The setup was running for almost 6 days now and I notice the white coating (oxidization) started to form at cathode. I can't comment on amount of gas produced because I can't measure it by observing but looks like the gas production increase a bit compared to earlier.
I will leave the setup as it is for another week or two and see if the white coatings covers fully on cathode. Will let you know the progress as time goes on.