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Characterization of metal hydrides for thermal applications in vehicles below 0 °C

Kölbig, Mila and Bürger, Inga and Linder, Marc Philipp (2019) Characterization of metal hydrides for thermal applications in vehicles below 0 °C. International Journal of Hydrogen Energy. Elsevier. ISSN 0360-3199.

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Metal hydrides promise great potential for thermal applications in vehicles due to their fast reaction rates even at low temperature. However, almost no detailed data is known in literature about thermochemical equilibria and reaction rates of metal hydrides below 0°C, which, though, is crucial for the low working temperature levels in vehicle applications. Therefore, this work presents a precise experimental set-up to measure characteristics of metal hydrides in the temperature range of -30 to 200 °C and a pressure range of 0.1 mbare100 bar. LaNi4.85Al0.15 and Hydralloy C5 were characterized. The first pressure concentration-isotherms for both materials below 0 °C are published. LaNi4.85Al0.15 shows an equilibrium pressure down to 55 mbar for desorption and 120 mbar for absorption at mid-plateau and -20 °C. C5 reacts between 580 mbar for desorption and 1.6 bar for absorption at -30 °C at mid-plateau. For LaNi4.85Al0.15, additionally reaction rate coefficients down to -20 °C were measured and compared to values of LaNi5 for the effect of Al-substitution. The reaction rate coefficient of LaNi4.85Al0.15 at -20 °C is 0.0018 s^-1. The obtained data is discussed against the background of preheating applications in fuel cell and conventional vehicles.

Item URL in elib:https://elib.dlr.de/129745/
Document Type:Article
Title:Characterization of metal hydrides for thermal applications in vehicles below 0 °C
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kölbig, Milamila.koelbig (at) dlr.deUNSPECIFIED
Bürger, Ingainga.buerger (at) dlr.deUNSPECIFIED
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Metal hydride Pressure concentration-isotherm Reaction rate coefficient LaNi4.85Al0.15 Hydralloy C5
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Antriebssystem und Energiemanagement
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Dieterich, Mila
Deposited On:16 Dec 2019 16:08
Last Modified:16 Dec 2019 16:08

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