Hi Fabio,
I just saw your new video on YouTube and it looks pretty good. Short and Simple.
I've found in the past that when water vapor is pulled into a clear plastic hose (by a vacuum on the other end) the tube will fill up with plugs of water, separated by a short distance of air. If you fed a charged steam generator into the hose, the water packets would carry the charge. As the ion containing water passes through a ring connected to a capacitor with the same polarity, kinetic energy will be transformed into a higher potential on the capacitor. This may be one way you can try extracting energy from the ions.