| http://www.w3.org/ns/prov#value | - The trick is to combine the materials in such a way that they are not only stable and robust but also have the right band gaps to generate enough voltage to split water.Turner, who has been with NREL since 1979, says the cleanest way to produce hydrogen is by using sunlight to directly split water into hydrogen and oxygen.The amount of greenhouse gases such a method can save is almost unfathomable
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