This "solar fuel" cycle uses the excess electrical renewable energy to create hydrogen via electrolysis of water.

Rutgers researchers have found a potential way to create hydrogen on demand for a fuel cell.

I don't know enough about it, so could somebody explain why energy from renewable sources cant be used to create hydrogen by electrolysis for later re-use?

Both require the energy to be produced in the first place, whether to create electricity or to create hydrogen.

One reaction not involving silicates which can create hydrogen is:

Water molecules are split by electricity produced by wind turbines in order to create hydrogen and oxygen.

The Monean's employed hydrolysis to create oxygen and hydrogen for fuel cells.

Here the supplied electrons and the protons that have conducted through the membrane are combined to create gaseous hydrogen.

Fuel cell cars are not truly emission-free, because it takes energy, and emissions, to create pure hydrogen.

The environmentalists can imagine fields of solar cells in deserts, creating hydrogen for fleets of fuel cell vehicles.