in a diamond battery what serves as anode and cathode, how do you connect wires to a diamond?

this diamond making process would be quite hazardous.

I wonder if they should just create a layer of diamonds and and sandwich that between C14 rather than try and rely just or those diamonds to power spacecraft (would save having to develop the non-radioactive diamond layer).

would a standard diamond also do that trick, I don't see why a radioactive diamond would be different if it is in the presence of C14?