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Experimental and Numerical Study of the Effect of Gas-Shrouded Plasma Spraying on Cathode Coating of Alkaline Electrolysis Cells

Liu, Taikai and Reissner, Regine and Schiller, Günter and Ansar, Asif (2017) Experimental and Numerical Study of the Effect of Gas-Shrouded Plasma Spraying on Cathode Coating of Alkaline Electrolysis Cells. Journal of Thermal Spray Technology. Springer. DOI: /10.1007/s11666-017-0654-2 ISBN 1544-1016 ISSN 1059-9630

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Official URL: https://link.springer.com/article/10.1007/s11666-017-0654-2

Abstract

The aim of this work is to improve the performance of electrodes prepared via atmospheric plasma spray by means of gas shrouding which is expected to apparently reduce the oxygen content of the plasma plume and subsequently improve the coating quality. Electrodes with dual-layer coating for alkaline water electrolysis were deposited on Ni-coated perforated substrates. Microstructure and morphology were studied by SEM. Element content was measured by EDS. Enthalpy probe was employed for measuring plasma temperature and velocity as well as the gas composition. For verifying and better understanding the shrouding effect numerical calculation was carried out according to the experimental settings. Electrochemical test was carried out to validate the shrouding effect. The results showed slight protecting effect of gas shrouding on plasma plume and the final coating. Overall the dual-layer region, the measured oxygen fraction was 3.46% and 3.15% for the case without gas shrouding and with gas shrouding respectively. With gas shrouding the coating exhibited similar element contents as the coating sprayed by VPS while no obvious improvement was observed in the microstructure or the morphology. Evident electrochemical improvement was nevertheless achieved that with gas shrouding the electrode exhibited similar performance as that of the VPS sprayed electrode.

Item URL in elib:https://elib.dlr.de/117744/
Document Type:Article
Title:Experimental and Numerical Study of the Effect of Gas-Shrouded Plasma Spraying on Cathode Coating of Alkaline Electrolysis Cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Liu, Taikaitaikai.liu (at) dlr.dehttps://orcid.org/0000-0001-9919-0841
Reissner, Regineregine.reissner (at) dlr.deUNSPECIFIED
Schiller, Günterguenter.schiller (at) dlr.deUNSPECIFIED
Ansar, Asifasif.ansar (at) dlr.deUNSPECIFIED
Date:9 November 2017
Journal or Publication Title:Journal of Thermal Spray Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :/10.1007/s11666-017-0654-2
Publisher:Springer
ISSN:1059-9630
ISBN:1544-1016
Status:Published
Keywords:atmospheric plasma spray; gas shrouding; alkaline water electrolyser; Computational fluid dynamics; hydrogen evolution reaction
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Liu, Taikai
Deposited On:22 Dec 2017 11:18
Last Modified:31 Jul 2019 20:15

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