Honda CEO Toshihiro Mibe says his company studied the potential for hydrogen combustion a decade ago but still doesn't see it as feasible for cars.

Automakers are pushing new uses for hydrogen that may, in turn, fan demand for the fuel and spur the development of a refueling network that could support sales.

Both Hyundai and Toyota see hydrogen as a viable alternative to battery-electrics. Hyundai just made a bold move forward.