What I don't understand well is if H2 is separated by Ni how H begins just a proton without electron ?
@DF: Here some brain food about Ni and other metalhydrides!
An extensive reference about NiH chemistry in batteries: http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2502&context=theses
More hard core: https://smartech.gatech.edu/bi…kim_kichul_201008_phd.pdf
One to try:
https://www.researchgate.net/p…ty_of_the_Mg2NiH4_hydride
Oxide reducation by H:
http://pubs.acs.org/doi/abs/10…b04313?journalCode=jpccck