Researchers at EPFL have come up with an inexpensive way to store solar energy as hydrogen. By doing this Solar Energy can be stored during the day and used at a later moment in time, for example at night. That way you would not lose any energy you harnessed during peak solar hours.
It is not the first time researchers have managed to convert solar energy into hydrogen. The most successful iteration of a device like this was able to attain an efficiency of 12.4 percent, but the materials used were expensive and would cost about $10,000 to cover a 10 square centimeter surface.
The EPFL researchers, led by Kevin Sivula, wanted to make something that could actually be produced and so they limited themselves to inexpensive materials and to production techniques that could easily be scaled up.