How do you convert solar energy into a fuel that you can use when there is no sun? A project team at Israel’s Technion is developing a solution that traps the energy as light in solar cells and then uses it to split water molecules into hydrogen and oxygen.
http://www.youtube.com/watch?v=xUmucXoOnSA&feature=youtu.be
http://www.nature.com/nmat/journal/vaop/ncurrent/pdf/nmat3477.pdf