How do thermocouples generate electrical energy?
A thermocouple produces a tiny voltage proportional to the
temperature difference between two junctions where dissimilar
Thermocouples use rare-earth metals (chromium, aluminum, nickel,
etc), usually in pairs. As these metals heat up, they react with
one another and one metal sheds off an electron, which is then seen
as electricity. Thermocouples usually produce a very small amount
of electricity, often only enough to operate electric 'gates'.