Hydrogen car. @9 minutes he says, 'Any car can be converted'
(www.youtube.com)
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Water running over copper plates under conditions produce electricity.
OK, but, as with most "renewable" claims this omits how large the device would need to be. According to: https://www.pnas.org/doi/abs/10.1073/pnas.1906601116 they did an experiment that produced "several tens" of milli Volts and "several" micro Amps per square centimetre.
For ease of reckoning let's make that 1mV and 100μA which gives 1 Watt for every 10 square metres. So a car with 100kW of power would need an area of a million square metres. Maybe sails would be simpler?
A small building would suffice according to the speech I heard.
That was for a small operating military base.
The size is relevant, depending on many factors.