Inevitably I will get the "PT is not supposed to be realistic, go to hell" stuff, but anyway:
We should add electrolyte, which will be a liquid (which can be mixed with something, maybe clay, to make solid electrolyte), into which you put electrodes (probably different from the current "electrode" element), to generate electricity.
Uses?
He means a element that will react with another and as a byproduct produce measureable energy(SPRK).
I will agree, what uses? We have no method or need to bother storing SPRK energy, and have an insuffiecient code base for elements as all would need a literal "Energy value" representing the total potential energy in one particle of a material. Yes, your idea Is possible, A logical one; No. As I said above, there is no need to add an element like this that acts as if releasing its chemical potential energy in the form of elecricity, as you could just use GLOW ISOZ and PSCN and NSCN to make a photoreceptive battery.
Well we have reactions involving electrons which convert into SPRK when contacting metals.