Thinking . .
Wouldn't a Turbo charger used to generate electricity and at the same time used to boost gas intake in the engine more successful to that application !? ..
It would create a certain amount of back pressure to the exhaust, but since it helps to boost engine efficiency, it would in a way, average things up ..
And what about a Tesla turbine instead of the usual turbo .. It would have much less back pressure and supposedly a very good efficiency ..
That could drive an electric generator to drive in it's turn an electrolysis device or something usefull ..