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Study of the structural, thermodynamic and cyclic effects of vanadium and titanium substitution in laves-phase AB2 hydrogen storage alloys

Ulmer, Ulrich and Dieterich, Mila and Pohl, Alexander and Dittmeyer, Roland and Linder, Marc Philipp and Fichtner, Maximilian (2017) Study of the structural, thermodynamic and cyclic effects of vanadium and titanium substitution in laves-phase AB2 hydrogen storage alloys. International Journal of Hydrogen Energy (42), pp. 20103-20110. Elsevier. DOI: 10.1016/j.ijhydene.2017.06.137 ISSN 0360-3199

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Abstract

The substitution of the high-purity and expensive raw materials vanadium (V) and tita- nium (Ti) by their low-cost, low-purity alternatives ferrovanadium (FeV) and Ti sponge in Ti0.98Zr0.02V0.43Fe0.09Cr0.05Mn1.5 was investigated and the microstructural, thermodynamic and cyclic properties were tested of these compounds. Four different samples were pre- pared and studied: one material prepared with high-purity V and Ti, a second one prepared with FeV in substitution for V and Fe, a third prepared with Ti sponge in substitution for Ti, and a fourth prepared with FeV and Ti sponge in substitution for V, Fe and Ti. The sub- stitution of Ti with Ti sponge and of V and Fe by FeV had negligible effects on the micro- structural properties. 2.0 mass% H were absorbed in both the pristine (high-purity V and Ti) material and after replacing Ti by Ti sponge. Substitution of V by FeV reduced the initial hydrogen absorption capacity to approximately 1.7 mass%. All materials exhibited equi- librium hydrogen absorption and dissociation pressures of ca. 1.5 MPa. They reversibly stored 1.8 mass% H for both the pristine and Ti-substituted samples and 1.6 mass% H after substitution of V and Fe by FeV or after substitution of V, Fe and Ti by FeV and Ti sponge, respectively. Long-term cyclic experiments over 1000 de-/hydrogenation pressure swing cycles were performed for the pristine material and after substitution of V, Fe and Ti by FeV and Ti sponge, respectively. Both materials exhibited similar activation and degradation behavior upon cycling. A reversible capacity of 1.5 mass% H was recorded for the pristine material after 1000 cycles, and 1.4 mass% H were reversibly stored in the material prepared with FeV and Ti sponge subjected to 1000 cycles. The raw material cost to store an equal amount of hydrogen can be reduced by 83% when V and Ti are substituted by FeV and Ti sponge. © 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Item URL in elib:https://elib.dlr.de/113566/
Document Type:Article
Title:Study of the structural, thermodynamic and cyclic effects of vanadium and titanium substitution in laves-phase AB2 hydrogen storage alloys
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ulmer, Ulrichu.ulmer (at) utoronto.caUNSPECIFIED
Dieterich, MilaMila.Dieterich (at) dlr.deUNSPECIFIED
Pohl, AlexanderUNSPECIFIEDUNSPECIFIED
Dittmeyer, RolandUNSPECIFIEDUNSPECIFIED
Linder, Marc PhilippMarc.Linder (at) dlr.deUNSPECIFIED
Fichtner, Maximilianm.fichtner (at) kit.eduUNSPECIFIED
Date:2017
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.2017.06.137
Page Range:pp. 20103-20110
Publisher:Elsevier
ISSN:0360-3199
Status:Published
Keywords:Ti sponge Ferrovanadium AB2 Hydrogen storage Cyclic properties
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 - NGC-Energiemanagement (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Thermal Process Technology
Deposited By: Dieterich, Mila
Deposited On:24 Nov 2017 14:21
Last Modified:31 Jul 2019 20:11

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