prov:value
| - The hydrogen-permeable metal of the NPSP layer is preferably vanadium, niobium, tantalum, titanium, zirconium, and alloys thereof and alloys of vanadium, niobium, tantalum, titanium and zirconium with other metals, including for example, Al, Co, Cr, Fe, Mn, Mo, Nb, V, Ti, Ta, Cu, Ni, Ga, Ge, Sn, Zr, Si, W, La, Be, and Hf or mixtures thereof.
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