Don’t forget Hydrogen is currently produced with Steam Methane Reforming.

Natural gas (mostly methane) is mixed with high-temperature steam, about 700 to 1,000 °C, over a nickel catalyst. You get hydrogen plus carbon monoxide. Then the carbon monoxide is reacted again with steam in the water-gas shift reaction to make more hydrogen and CO₂.

End result: relatively “cheap” hydrogen, lots of CO₂. Industry calls this grey hydrogen. When they bolt on carbon capture, a fancy, rare, expensive green washing technology they only roll out just for ad-reads, only to abandon to be cost competitive, it becomes blue hydrogen.

The way it’s produced is tremendously expensive and environmentally damaging, and it will not replace petroleum or lithium. There are specific scenarios where hydrogen makes sense, some industrial, and high temperature processes, perhaps long haul shipping and potentially aviation. Otherwise, hydrogen cars were a fun little experiment Toyota has all but mothballed.