Thermionic Cells

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Does anyone know anything about thermionic cells? I have the basic of how they work, but am curious about the details.

[killerinstinct]

There is such thing as thermionnic cells? respect to technology?
heard of photoelectric cells and photovoltaic cells, but no idea wut thermionnic cells.

[Gokul43201]

Thermionic emission is what you get when you heat up a cathode - so I believe a vacuum tube diode is a thermionic device. Not sure exactly what "thermionic cell" refers to...but I think I've heard of thermionic reactor cells, or something like that.