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Long-term cycle stability of metal hydride-graphite composites

Dieterich, Mila and Pohlmann, Carsten and Bürger, Inga and Linder, Marc and Röntzsch, Lars (2015) Long-term cycle stability of metal hydride-graphite composites. International Journal of Hydrogen Energy. Elsevier. DOI: 10.1016/j.ijhydene.2015.09.013 ISSN 0360-3199

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Abstract

Recently, metal hydride composites (MHC) have been proposed which consist of a hydride forming metal alloy and a highly heat conduction secondary phase such as expanded natural graphite (ENG) in order to improve the thermal conductivity of metal hydride powder beds. However, only little data is available in the literature on the effects of extensive cycling on technically relevant properties of MHC. In this paper, hydrogenation characteristics, thermal conductivity and geometrical stability of Hydralloy® C5-based MHC were thoroughly investigated over 1000 cycles. The obtained results suggest that the MHC under study did not significantly alter their hydrogen uptake characteristics throughout cycling, despite the fact that their thermal conductivity decreased during the first 250 cycles but remained constant thereafter. Although the cylindrical MHC maintained their geometrical stability, radial cracks were detected after cycling. Based on these results, MHC are suitable for high-dynamic applications such as hydrogen storage or thermochemical devices.

Item URL in elib:https://elib.dlr.de/101167/
Document Type:Article
Title:Long-term cycle stability of metal hydride-graphite composites
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dieterich, Milamila.dieterich (at) dlr.deUNSPECIFIED
Pohlmann, CarstenUNSPECIFIEDUNSPECIFIED
Bürger, Ingainga.buerger (at) dlr.deUNSPECIFIED
Linder, Marcmarc.linder (at) dlr.deUNSPECIFIED
Röntzsch, LarsLars.Roentzsch (at) ifam-dd.fraunhofer.deUNSPECIFIED
Date:2015
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.ijhydene.2015.09.013
Editors:
EditorsEmail
Veziroglu, T.N.UNSPECIFIED
Publisher:Elsevier
ISSN:0360-3199
Status:Published
Keywords:Cycle stability; ENG; Heat transfer enhancement; Hydralloy® C5; MHC; Metal hydride; Metal hydride composites (MHC); expanded natural graphite; metal hydride composite
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Fahrzeugenergiesystem III (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Dieterich, Mila
Deposited On:16 Dec 2015 15:25
Last Modified:31 Jul 2019 19:58

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