Maximizing Hydrogen & Oxygen Output in Water Electrolysis: Plate Design & Power Source

Hi - I want to split water into hydrogen and oxygen as efficiently as possible. I don't care if the result is a mixture of the two gases.

I've experimented (carefully!) with a couple of plates, about 5cm x 3, 2cm apart, submerged and plugged into the mains. A lot of bubbles come off, but soon the water starts boiling, which is probably highly efficient for making tea, but not for gas production.

Also, I've tried an old air-spaced tuning capacitor, with very close interleaved plates. Sure enough, bubbles come off but not in the quantity I'd hoped. Perhaps some vibration would help to shake the bubbles loose and maintain water between the plates?

Any help appreciated!
Thank-you,

do you want it to make steam? because if so you can put a coil and just have the two ends on the same as long as the wires are completly away from interacting with water aka a cover and then place the coild and net to water it will make it produce steam as it heats up.