Can heat generate triboelectricity?

[Stanley514]

There is well known pyroelectric effect in which polarisation of
crystals occur under heat.
I thought that pyroelectric could be good energy converter if not
problems associated with it.Thus,heat should be applied in impulses and there might be a great looses associated with cycles.Also electric breakdown may occur at certain level of electric field.
I would be glad to know if there is some effect similar to pyroelectric,
but without problems of latest.For example something similar to
triboelectric static charge induced by heat instead of "friction",so it
will work steadily as Van-der-Graaf generator?In which materials heat
may cause static charges accumulation on surface?

 

[DrZoidberg]

Thermocouples can be used to generate electricity from heat. They have even been used to power space probes using plutonium as a heat source.