look at 11:55 minutes
he seems to be energising the inner rods and have them alternate you can see the outside of the tubes generating h2 or 02 intercalated.. .very nice
there is a video i share in my facebook of a lemon battery with multiple electrodes at the same lemon that together with this video made me thought
in this cell the tubes have gases being generated on both sides but one is shield.. its inside a hollow cavity
it appears to me that we could get some strange results different than distant electrodes in water... first because between the tubes being so small makes the bubbles force a water flow and the bubbles also forms bigger bubbles automatically rising up...
i was asking my self how the capacitance would change connecting them in series in this way... like he did..
my plate cell won't have this feature because of the sizes i guess.. however should still make a good capacitance.. there seems to last still around 150cm2 of area...