Maybe an interesting article on hydrogen in Pd and influence of gold alloying.
Gold plating seems important in some expertyiments. i remember of Dennis Letts about that.
Materials that absorb hydrogen are used for hydrogen storage and purification, thus serving as clean energy carriers. The best-known hydrogen absorber, palladium, can be improved by alloying it with gold.
New research led by The University of Tokyo Institute of Industrial Science explains for the first time how gold makes such a difference, which will be valuable for fine-tuning further improvements.
Read more at: https://phys.org/news/2018-07-…hydrogen-storage.html#jCp
More information: Kazuhiro Namba el al., "Acceleration of hydrogen absorption by palladium through surface alloying with gold," PNAS (2018). www.pnas.org/cgi/doi/10.1073/pnas.1800412115