I think the cifficulties with hydrogen FCs right now are: 1. Efficient production of Hydrogen at the pump station. 2. Storage of hydrogen in the vehicle. Even

I think the cifficulties with hydrogen FCs right now are: 1. Efficient production of Hydrogen at the pump station. 2. Storage of hydrogen in the vehicle. Even liquid hydrogen isn’t very dense and has a rather low energy per volume. 3. FC catalyst. I think right now FC catakysts require precious metal catalysts like platinum and palladium.