The charging of devices or other electronics by friction, futuristic ,or has it been already realized?
Also are solar and wind power charging more efficient? Should my civilization rely on those other than tribostatic charging?
It's real, today, but not as widespread as one would expect.
"More efficient" depends on context. If I want fast charging of multiple devices, tribostatics are not the charger of choice. For low volume charging over time, they look promising IMHO.