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Formation of desert rose structures in vacuum plasma sprayed electrodes for alkaline electrolysis

Bentzen, J. J. and Zhang, Wei and Jorgensen, P. S. and Bowen, J.R. and Reissner, R. (2014) Formation of desert rose structures in vacuum plasma sprayed electrodes for alkaline electrolysis. In: 18th international Microscopy Conference Proceedings. 18th International Microscopy Congress, 07.-12. Sept 2014, Prag, Tschechien. ISBN 978-80-260-6720-7

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The EU FCH-JU RESelyser project is concerned with the development of high pressure, high efficiency and low cost alkaline water electrolysers that can be operated variably and intermittently to meet the demands for integration into energy networks relying on fluctuating renewable energy. The project utilizes NiAlMo alloy electrodes produced at the German Aerospace Center (DLR) by vacuum plasma spraying (VPS). VPS results in a heterogeneous microstructure consisting of a multitude of intermetallic phase sub domains and pores. Prior to electrolysis operation the electrodes are activated by leaching of Al and some Al containing intermetallic phases leaving micrometer pores and nanometer dendritic pores increasing the surface area available for the electrolysis reactions. The vacuum plasma sprayed electrodes were analyzed by high resolution SEM and TEM before and after electrolysis operation and after storage in water. Analyses of cross sections and electrode surfaces revealed desert rose like nano flake structures on the surface and in the pores on several electrodes. The formation of the desert rose structure appeared to be related to the electrolysis operation as well as the duration of storage in distilled water. The size of the faceted flakes varied from tens of nm to a couple of µm where the thickness varied from a few nm to ~50 nm. The desert rose structure was confirmed by TEM to consist primarily of NiO and Al2NiO4 like phases (similar lattice parameters). The possible implications for the application and performance of the electrodes are discussed.

Item URL in elib:https://elib.dlr.de/92701/
Document Type:Conference or Workshop Item (Poster)
Title:Formation of desert rose structures in vacuum plasma sprayed electrodes for alkaline electrolysis
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Reissner, R.regine.reissner (at) dlr.deUNSPECIFIED
Date:7 September 2014
Journal or Publication Title:18th international Microscopy Conference Proceedings
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Electrodes Raney Nickel Plasma Spraying Microscopy
Event Title:18th International Microscopy Congress
Event Location:Prag, Tschechien
Event Type:international Conference
Event Dates:07.-12. Sept 2014
Organizer:Czechoslovak Microscopy Society
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Reißner, Regine
Deposited On:01 Dec 2014 15:31
Last Modified:31 Jul 2019 19:49

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