Calling it a waste product here was mostly in jest. It's not every day that oxygen is the byproduct of a process, and not the goal itself.
This is something I'd forgotten about this process - use energy to separate hydrogen and water, then recombine later to release the energy. And the waste product from this is the water used to start the process (and the energy and heat lost to entropy). Very clean!
This is something I'd forgotten about this process - use energy to separate hydrogen and water, then recombine later to release the energy. And the waste product from this is the water used to start the process (and the energy and heat lost to entropy). Very clean!