Does Thermionic emission require vacuum?

Will a hot cathode emit electrons outside of a vacuum? If that won't work, what other ways could I get electrons in a non-vacuum environment? The only thing I can think of is making some plasma and pulling the electrons out electrostaticaly.

Re-design7 years ago
IIRC. Thermionic emission will work off any hot metal but it works much more efficiently in a vacuum and without a vacuum the metal tend to burn up much sooner.
Jaycub (author)  Re-design7 years ago
Thank you, that's close to the answer I was hoping for.