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Intertesting. Tantalum is already used in electronics for capacitors (Ta2O5 or something like that).

Only when required, though. It's a conflict resource (which tends to make it more expensive).

Same would apply here, but the paper talks about moving molecules around so maybe quantity would eliminate the issue.

Yeah. $1000+ for a single tantalum hybrid cap [1] is a bit much, but for some applications there’s no real alternative.