https://www.sciencedaily.com/releases/2017/06/170614091833.htm Almost too good to be true. A new molybdenum sulphide based coating combined with titanium dioxide (common pigment in white paint) can catalyze the break down hydrogen and oxygen from water vapor in the air. The system is suitable for use in relatively dry climates located near oceans. The hydrogen and oxygen produced may be collected and used as a clean energy source.
(humor , folks! -->) So . . . . there you go folks! . . . . . just solved the 'clean energy' and 'climate change' issues (i.e., 2 birds) with a single stone! But . . . . if used as a house paint, your house might explode! (<--humor, folks!)
I hadn't thought of that side effect! What if we painted a dirigible with this stuff? Oh, the humanity! Would it work on Mars to produce breathable air from snow? There has to be a lower limit on workable sunlight intensity too, right? My dehumidifier could provide its own power and replace those solar cells on the roof as well. Works better than a real battery system for Solar City. Are you listening, Elon?