Investigations of the structural stability of metal hydride composites by in-situ neutron imaging
PBN-AR
Instytucja
Wydział Fizyki i Informatyki Stosowanej (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
Journal of Power Sources
ISSN
0378-7753
EISSN
1873-2755
Wydawca
Elsevier Science BV
Rok publikacji
2015
Numer zeszytu
Strony od-do
109--118
Numer tomu
293
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.71
Autorzy
(liczba autorów: 10)
Pozostali autorzy
+ 8
Słowa kluczowe
EN
neutron radiography
neutron tomography
volume swelling
AB2-type Ti-Mn alloy
metal hydride composite
heat and gas transfer
Streszczenia
Język
EN
Treść
Metal hydride composites (MHC) with expanded natural graphite (ENG) exhibiting enhanced thermal conductivity and reduced porosity compared to metal hydride powders can enable a reversible, compact and safe way for hydrogen storage. In this study, neutron imaging during cyclic hydrogenation was utilized to investigate the structural stability and the spatial-temporal hydrogen concentration of application-oriented MHC with 40 mm in diameter compared to a loose metal hydride powder. In particular, swelling and shrinking effects of a radially confined MHC which could freely expand upwards were studied. It was found that the loose powder bed was easily torn apart during dehydrogenation, which leads to increased thermal resistance within the hydride bed. In contrast, the thermal resistance between MHC and container wall was minimized since the initial gap closes during initial hydrogenation and does not reopen thereafter. Further cyclic hydrogenation caused MHC volume changes, i.e. an almost reversible swelling/shrinking (so-called “MHC breathing”). Moreover, neutron imaging allowed for the observation of reaction fronts within the MHC and the powder bed that are governed by the heat transfer.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:095551
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