Ok, the title might be a bit misleading … the cheapness is relative to industrial scale methods. But … Colorado University researchers have developed a novel way to use sunlight to facilitate a metal catalyst based water splitting with hydrogen being the resulting product. Not only does the process use freely available sunlight for power it also makes it possible to conduct the two required chemical reactions at the same temperature thus reducing the complexity, expense and problems of the system.
But it begs the questions: If this process sees the Oxygen bind to the metallic compound, what will they do with all the oxides created? Are these recyclable in some way?
Read more about it here:
University of Colorado at Boulder (2013, August 1). New water splitting technique efficiently produces hydrogen fuel. ScienceDaily. Retrieved August 2, 2013, from http://www.sciencedaily.com /releases/2013/08/130801142331.htm