One problem with hydrogen is storing, it is rather lightweight, even when compressed to be liquid, which is good, but it is hard to contain in a steel tank. Sou

One problem with hydrogen is storing, it is rather lightweight, even when compressed to be liquid, which is good, but it is hard to contain in a steel tank. Source: Few materials are suitable for tanks as hydrogen being a small molecule tends to diffuse through many liner materials and hydrogen embrittlement causes weakening in some types of metal containers taken from https://en.wikipedia.org/wiki/Hydrogen_economy