it got me to think
if we could use the resonance to move the particles if they are charged particles it will create an electromagnetic field that could be possibly "collected" or measured
i once had my cell to play like a 2,5khz tone like if it was a tweeter ... i posted somewhere.. i wasnt the stan big cell it was my small acrylic cell and it was loaded with KOH
strangely the reaction only occurred when the starting water was pure and koh was gradually added.. the volume of water was few milliliters so it boils fast...
at the time the dc was from variac and it was pulsed at this frequency i remember that when changing the frequency the sound stops and only return at this frequency
the inside rod is smaller than the tube where it fits in and is solid...
i made some acrylic disks with holes to water to pass and the gas to come out and isolate the water from leaking by using a oring that allow the electical connection on the outside... the electrode also hold the cell together on the other side you can see this on youtube video