Negative electrode is a Tungsten TIG welding electrode, with most of it wrapped in Teflon Tape. Only the tip is exposed. Positive Electrode is a piece of Stainless Steel perforated sheet metal, about 3 x 4 inches.
The Plasma forms around the Negative electrode. The Negative electrode is also where the Hydrogen bubbles up in conventional electrolysis (Oxygen on the Positive).
The difference in surface area of the two electrodes causes there to be a higher Current Density on the Negative one.
I think :)
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