TY - JOUR
T1 - Effect of additives on hydrogen release reactivity of magnesium hydride composites
AU - Markman, E.
AU - Luzzatto-Shukrun, L.
AU - Levy, Y. S.
AU - Pri-Bar, I.
AU - Gelbstein, Y.
N1 - Funding Information:
This work was supported by the Ministry of Energy, Goverment of Israel (Grant number 220-11-050). We want to thank Mr. Y. Weinberg and Mr. E. Ayalon for outstanding contribution to the development and the maintenance of our instrumentation.
Funding Information:
This work was supported by the Ministry of Energy , Goverment of Israel (Grant number 220-11-050).
Publisher Copyright:
© 2022 Hydrogen Energy Publications LLC
PY - 2022/8/26
Y1 - 2022/8/26
N2 - Magnesium hydride, a compound potentially applicable as a hydrogen carrier and energy storage material, releases hydrogen via hydrolysis or thermolysis. Ball-milled MgH2 composites were studied to optimize the kinetics and yield of the dehydriding process. Milling MgH2, under inert atmosphere increased the susceptibility to oxidation: the amount of MgO produced following air exposure of pulverized MgH2 was found to be proportional to the milling duration. Incorporation of protective coatings to avoid undesirable oxidation was studied: addition of anionic surfactants or expanded graphite as milling aids reduces the susceptibility of MgH2 to oxidation, presumably via formation of a protective layer. Such coatings minimize the access of oxygen to the particle surface upon exposure to air and facilitate manipulations, such as performing analysis, under ambient atmosphere. Improved dehydriding efficiency of oxidation-protected milled composites was demonstrated. Hydrolysis of pristine magnesium hydride and MgH2-composites with aqueous hydrolysates containing aprotic polar solvents demonstrated a significant increase of dehydriding efficiency.
AB - Magnesium hydride, a compound potentially applicable as a hydrogen carrier and energy storage material, releases hydrogen via hydrolysis or thermolysis. Ball-milled MgH2 composites were studied to optimize the kinetics and yield of the dehydriding process. Milling MgH2, under inert atmosphere increased the susceptibility to oxidation: the amount of MgO produced following air exposure of pulverized MgH2 was found to be proportional to the milling duration. Incorporation of protective coatings to avoid undesirable oxidation was studied: addition of anionic surfactants or expanded graphite as milling aids reduces the susceptibility of MgH2 to oxidation, presumably via formation of a protective layer. Such coatings minimize the access of oxygen to the particle surface upon exposure to air and facilitate manipulations, such as performing analysis, under ambient atmosphere. Improved dehydriding efficiency of oxidation-protected milled composites was demonstrated. Hydrolysis of pristine magnesium hydride and MgH2-composites with aqueous hydrolysates containing aprotic polar solvents demonstrated a significant increase of dehydriding efficiency.
KW - Ball-milled magnesium hydride composites
KW - Hydrolysates containing aprotic polar solvents
KW - MgH dehydriding kinetics
KW - MgH surface air oxidation
KW - Surfactant and expanded graphite milling-aid additives
UR - http://www.scopus.com/inward/record.url?scp=85137024419&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2022.07.025
DO - 10.1016/j.ijhydene.2022.07.025
M3 - Article
AN - SCOPUS:85137024419
SN - 0360-3199
VL - 47
SP - 31381
EP - 31394
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 73
ER -
