Länk - Fotoelektriska dioder katalyserar vätgas ur vatten direkt från solljus
The photoelectrochemical diodes function the same way that green leaves do, only not quite as well. They convert the energy from the sun into electrical energy that then breaks up water molecules. The titanium dioxide side of the diode produces oxygen and the copper titanium side produces hydrogen. Although 0.30 percent efficiency is low, Grimes notes that this is just a first go and that the device can be readily optimized.
Läs mer: Researchers generate hydrogen without the carbon footprint | Science Blog