A "Tech" or "Science" element could be interesting, but doesn't seem very....elemental, to me. Maybe it'd be better for science/techy ideas to be incorporated into already existing elements instead?
As for this whole concept of coming up with a new element....It seems very difficult. It appears that all the bases have already been covered, from simplistic, earthly, nearly pagan-esque elements, to the grandiosity of space time and the fabric of the universe. (
) The best idea I've been able to come up with thus far is "Will", or maybe referring to Tech as the "Knowledge" element, but I think those are nearly identical to "Mind". :/
Tech could be "Metal", drawing inspiration from the ancient chinese elements. There's also "Spirit", ala ancient Japanese elements. "The Boundless" ala Ancient Greek Philosophy would be interesting, or "Void", but I believe both are the same thing as Aether.