Improved durability of hydrogen storage alloys

Surface-modified advanced hydrogen storage alloys for hydrogen separation and purification

“…PGM coatings, being extremely active towards dissociative H 2 chemisorption enable hydrogen to rapidly absorb in the bulk material, while still maintaining the hydrogenation activity even after extensive exposure to the impurities inhibiting hydrogen sorption. Various methods were used for the introduction of PGM into the substrate, including electrochemical [11] and electroless [11][12][13][14] plating techniques, PVD [11,15], or mechanical treatment [16][17][18][19][20][21]. The obtained PGM-containing composites were characterised by superior, as compared to the parent MH material, hydrogenation/dehydrogenation performances which were not significantly deteriorated after long-term exposure to aggressive environments.…”

Nanostructured surface coatings for the improvement of AB5-type hydrogen storage intermetallics

“…The generation of the rare earth fluoride layers (REF 3 ) with high specific area deposited on the surface of rare earth-nickel AB 5 -type intermetallics is known to produce a Ni-rich sub-layer, thereby increasing the surface catalytic activity [13][14][15][16]. In doing so, fluorination of AB 5 -type intermetallics has also been reported to improve performances in initial activation, reaction kinetics, durability, hydrogen selectivity, sorption stability at the gas-solid interface [16,17], and importantly, to increase the specific surface area of the intermetallide of interest [18].…”

Increased performance of hydrogen storage by Pd-treated LaNi4.7Al0.3, CaNi5 and Mg2Ni

“…In a separate paper [14], it is shown that this treatment also results in high durability of hydrogen storage and activation for air exposure. The ready activation behavior and fast absorption/desorption rates can be retained even after more than 2 years air exposure.…”