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Titanium coatings deposited by thermal spraying for bipolar plates of PEM electrolysers

Gago, Aldo and Ansar, Asif and Wagner, Norbert and Arnold, Johannes and Friedrich, K. Andreas (2013) Titanium coatings deposited by thermal spraying for bipolar plates of PEM electrolysers. Chapter 06 - session A07. 4th European PEFC and H2 Forum 2 - 5 July 2013, Lucerne Switzerland.

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Abstract

Proton exchange membrane (PEM) electrolysers are promising systems for generating high purity hydrogen. One of the key components of these devices is the separator or bipolar plate. These plates are normally made of Ti since the passive layer of TiO2-x protects it against corrosion in the aggressive environment of a PEM electrolyser. Unfortunately, this metal is expensive and machining the flow channels is complicated. A more suitable material would be stainless steel (SS). However it corrodes when used for bipolar plates. Additionally, Fe and Cr ions poison the membrane electrode assembly (MEA) of the electrolyser. Therefore, the SS bipolar plates have to be protected with a coating that is corrosion resistant in acid environment and conductive. In this work we produced Ti coatings on SS Crofer® 22 H substrates by vacuum plasma spraying (VPS) technique. Several parameters such as the type of nozzle, the powder feed rate, the plasma gas flow (Ar, N2 and H2) were systematically varied. Titanium powder (45 μm) was sprayed in absence of O2 to prevent the formation of TiO2-x, which would reduce the electronic conductivity of the coating. Dense layers of Ti were produced with high plasma enthalpy. XRD measurements revealed that the resulting coatings were pure α-Ti. The densest coating, deposited with 21.27 MJ kg-1, had a leak rate of 4.3 mbar l cm-2. A coating development on SS bipolar plates resulted in low corrosion currents, demonstrating the promise of a good application for PEM electrolysers with bipolar plates made of stainless steel.

Item URL in elib:https://elib.dlr.de/92736/
Document Type:Proceedings
Title:Titanium coatings deposited by thermal spraying for bipolar plates of PEM electrolysers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gago, Aldoaldo.gago (at) dlr.deUNSPECIFIED
Ansar, Asifasif.ansar (at) dlr.deUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Arnold, Johannesjohannes.arnold (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:2 July 2013
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 11-18
Publisher:4th European PEFC and H2 Forum 2 - 5 July 2013, Lucerne Switzerland
Series Name:Chapter 06 - session A07
Status:Published
Keywords:Titanium coating thermal spraying VPS bipolar plates of PEM electrolyser
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: Gago, Aldo
Deposited On:01 Dec 2014 15:36
Last Modified:31 Jul 2019 19:49

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