Turbo Dynamo Possible?

[OWL]

I've often wondered why no hybrids have a turbo dynamo.. Using the exhaust to power a dynamo while the engine is running to charge the battery and scavenge every little bit or energy from being wasted? It would require a ceramic connector to keep the exhaust heat from burning up the dynamo. That would seem to be the only obstacle?
OWL

[oil pan 4]

Because turbochargers spin any where from 40,000 to 200,000 RPMs.
At extremely high speeds windage losses, eddy current losses would be extreme. Parts that turn at high speed are far more expensive.
Belt driven alternators are better.
Instead use a turbo as a turbocharger to force feed more air into a diesel that would be most efficient use of exhaust waste heat.