Don't forget the Galvanic Series, copper and rebar would definitely be dissimilar, which means oxidation and possibly corrosion. Steel being inside, copper out, with the connection say from a copper leader to the charger, would seem to work, but its hard to say how long the pipe would last or the extent of oxidation on the interior, would it eventually corrode the wall thickness of the copper pipe might take awhile. Same thing with copper and galvanized, they are dissimilar and will oxidize. If had some sort of dielectric union, well thats for plumbing transitions from one material to the other, but say a bond break between the 2 materials, that would prevent galvanic action, or oxidation from dissimilar metals in contact, also in moist conditions which would make it worse.
Aside from the electrical specifications calling for something particular, copper clad with moist soil always worked well for me, there are times you have to soak around the ground rods, with a hose not a bucket to get the moisture up adequate enough, soak dry ground with a bucket, its going to absorb that in no time, you need a soaker.
We have places that ledge rock is only a few feet down, so I take several shorter copper clad rods, cut from one, drive those in, clamp each in series and wire with 10 ga, thhn non stranded copper or what the heck it is with the insulation, also use copper to the galvanized steel wire, so that I have the best conductor material to ground and to the fence. Again the splice between copper and galvanized wire is dissimilar materials, can or will oxidize, so those get splices get checked, cleaned, re-done if need be.
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