Create static electricity from batteries I have to demonstrate a simple DIY electroscope.

For this I need to create a source of static electricity using household materials. The weather at my place is very humid. So all my efforts of creating static electricity by triboelectric effect (rubbing for e.g. PVC pipe against silk/fur/wool, comb against hair/silk/fur/wool, vinyl against silk/fur/wool, balloon against silk/fur/wool) goes futile. The charge developed is nil to very less. I can see the electroscope work 1 out ot 10 times, that too not visually significant. Is there someway I could create some amount of static electricity using ordinary batteries?
PS: I am not looking for huge amounts of static electricity like in electrostatic generators
 A: The possible problem is that static electric charges tend to have very high voltage, though tiny amounts numbers of electrons. Consider how long a spark you can get from a comb in dry air, compared to the length of spark from 110 volt wires.
So it depends on how small a voltage your electroscope can detect. You don't need strong batteries, but you might need a lot of volts.
Ten 9-volt batteries in series will get you close to 90 volts. That might be enough. Or if your electroscope is sensitive, maybe even fewer.
The comment by @SolomonSlow suggests that 90 volts is unlikely to be enough. So it might work better to use a voltage multiplier to get hundreds or thousands of low-amperage volts. At this point the project to test the electroscope looks considerably more complex than the project to build the electroscope.
I vaguely remember reading about somebody who gave static electricity demonstrations who had the problem that sometimes the air was too humid. So he developed some ways to temporarily get dryer air around his experiment. But I don't remember exactly what he did. It involved some sort of aerosol can.
Maybe you could wave some dry ice around your electroscope, and the low temperature might condense moisture out of the air?
