In reply to JonesBeene's message of Wed, 19 Aug 2020 11:49:32 -0700: Hi, [snip] >The elements is rare, costly and does not appear in the list of MillsÂ’ >catalysts (but almost any element can be contorted to be catalytic,, as Mills >has repeatedly shown).
The 3rd ionization energy of Er is 22.739 eV. Close enough to 22.7 that thermal kinetic energy can make up the difference.