Diodes do build up, by their nature, a capacitive effect, but it is not sufficient enough to amount top anything, though a diode matrix, set up properly, is how stun guns get their ridiculous voltages by multiplying the voltage by the diodes. If you are working with windmills however, the key is AMPS, not Voltage. AMPS will fill up any battery to capacity, Volts will not.
I good way to make an almost self starting windmill would be to make an odd amount of magnets to the coils, as this would make the windmill want to turn, as it cannot settle it. Also, if the magnets spin, there is no need for a commutator, or brushes, less friction, though you are turning more mass initially. The coils standing still need no moving parts to transfer the amperage.
Diode bridges get dangerous real fast, and you won't know they killed you because you will be dead. The same with Capacitors. They do not release the energy stored, and you have to calculate the rate of discharge based on the resistor used, and the Pythagorean Theorem. This stuff could get you in trouble real fast. I have a 100Meg O'Scope, Dual Trace, an expensive leak Tester, in circuit capacitor tester )measures the ESR or the capacitor, same one, by make and model # used on the U.S.Space Shuttle!), "Fox and Hound" circuit tracers, and an incredibly beefy Isolation transformer, yet I see people doing things that have none of what I have, and have stopped many who were about to kill, or severely disable themselves, and they are powered, without isolation to the current coming into the house with the potential of bring 1000's of amps into their homes. I read in a post somewhere where someone was suggesting the use of old motor oil as an insulator for capacitors, yeah, with all that carbon in it, that a blowup that would have been.
You must be very careful with this stuff. Postulate a theorem, then try and figure it out. Doing things for the heck of it can get you killed. Not only that, without documenting every stage of success and failure, you will not be able to keep track of what you have done, and may not be able to reproduce it.
In direct response, if your blade was made of metal, and somehow not isolated from the electronics, you are playing with death. The blades must be isolated so that non of the static energy produced by them goes anywhere but back into the ground. Blades must be electronically neutral, with respect to the rest of the electronics. Blades should be made on on conductive materials.