It is not the only problem with all these fantasy ideas of hydrogen production, storage, solar panel farms, windmills and other pipe dream renewalble processes... the problem is they are not ready now and we have been forced into an economy destroying condition of destroying and pricing beyond reach the available conventional sources we have now.
We are not only shooting ourselves in the foot, or rather the administration is, we are going for a good tight pattern with multiple shots so as to blow the foot clean off.
This hydrogen storage technology for automobiles would be very good if introduced slowly over 25 years. Starting five years from now. I am very pro-oil and my car is the usual ICE type.
The only way that it makes sense, is if the electricity to split the H2O/ to make the H2/ comes from solar farms and wind farms. China is building vast solar farms, in addition to the usual of building more coal burning plants.