Thermionic Cells: Learn the Details

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

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