  Palladium satisfies most of the requirements for an effective hydrogen
storage material with two major drawbacks: it has a relatively low gravimetric
hydrogen density and is prohibitively expensive for large-scale applications.
Pd-based alloys should be considered as possible alternatives to a pure Pd. The
question is how much one can dilute the Pd concentration in a variety of
candidate materials while preserving hydrogen absorption capability. We
demonstrate that the resistivity measurements of thin-film alloy samples can be
used for a qualitative high-throughput screening and study of the
hydrogen-absorbing properties over the entire range of palladium
concentrations. Contrary to palladium-rich alloys where additional hydrogen
scattering indicates a degree of hydrogen content, the diluted alloy films
respond by a decrease of resistance due to their thickness expansion. Evidence
of significant hydrogen absorption was found in thin CoPd films diluted to just
20% of Pd.
