Every wonder why birds can sit on a 12,000 volt
power line and not die? It is because there is no
current (electrons) flowing through their bodies.
I imagine the same exact thing would happen to any biological fouling that wants to attach itself to your
hull...even if you hooked up the
electrical output of a nuclear power plant to your
hull.
Any sort of cathode (by convention and not electron flow) you hang over your hull is going to send
current straight to ground first and not to something attached to your hull first and then to ground, anode, negative or neutral....whichever the case may be.
Electricity takes the path of least resistance which will not be through fouling first. Interesting idea, but fouling is not a resistor/load in a closed circuit.