Solar and wind are great at producing hydrogen via electrolysis. Hydrogen as a storage medium for use in automobiles and much more.
This has been around for quite a while.
https://m.youtube.com/watch?v=rJBcXOoBipw
This is an episode of NOVA from 1979. At about 10:40 the concept of using a polymer is demonstrated.
Not economical yet. The vast majority of hydrogen is produced from natural gas
Hydrogen as a storage medium for use in automobiles and much more.
Yes, hydrogen can and will do that. Solar hydrocarbons will do that too eventually and those can also be sequestered or turned into carbon solids. It will all be part of the mix.
I don't know if I'd describe those methods as "great", but using wind and solar for electrolysis and technologies like the one described in the article for energy storage form a sort of ecosystem of offsetting deficiencies.
Solar and wind have a problem: the energy they collect and harness isn't available on demand. The energy is "free" (more accurately the energy is already present in the environment from the sun), but it needs to be stored to be most useful because the sun doesn't always shine and the wind doesn't always blow.
Electrolysis has a problem: physics. It takes more energy to split a water molecule than you can get out of using the resulting hydrogen and oxygen.
Storing the energy from an inefficient conversion is great, but it probably doesn't scale to an industrial level without a huge infrastructure investment and equipment footprint, much less scale to mass consumer use. That is not a particularly sexy problem to solve, but even in a niche industry use, it could certainly have a lot of value.