[GravitasFailure]

"Water (H2O) microdroplets are sprayed onto a magnetic iron oxide (Fe3O4) and Nafion-coated graphite mesh using compressed N2 or air as the nebulizing gas."[1]

Nafion[2] looks really interesting, too.

[1] https://www.pnas.org/doi/10.1073/pnas.2301206120 [2] https://en.wikipedia.org/wiki/Nafion