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Cost Reduction of large scale PEM Electrolysers by New Electro-catalysts and Bipolar Plates

Gago, Aldo und Wang, Li und Biermann, Katharina und Hosseini, Seyed Schwan und Gazdzicki, Pawel und Friedrich, K. Andreas (2015) Cost Reduction of large scale PEM Electrolysers by New Electro-catalysts and Bipolar Plates. EmHyTec 2014, 2014-12-08 - 2014-12-12, Taormina, Italien.

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Kurzfassung

Hydrogen is expected to play an important role as energy storage media when produced from renewable energies such as solar or wind by using proton exchange membrane water electrolysis (PEMWE) systems. Key components of the PEMWE that determine the stack cost are the bipolar plates (BPP) and the high loading of electro-catalyst for the OER in state of art membrane electrode assemblies. This presentation will discuss the potentials for cost reduction by synthesizing supported IrO2 electro-catalyst replacing the corresponding unsupported electro-catalysts. The supports need to be highly stable and exhibit sufficient electronic conductivity. A suitable support candidate has been identified that provides superior performance compared to the Ir black electro-catalysts. A more suitable material for bipolar plates would be stainless steel (ss), which is cheaper and easier to machine than titanium. However, it corrodes dramatically when used in PEMWE. Additionally, the ions released from the corrosion process poison the catalysts coated membrane (CCM) of the electrolyzer. Consequently, the stainless steel has to be protected with a coating that is corrosion resistant in acid environment and conductive, at the same time. We have developed a titanium coating for stain less steel BPP of PEMWE. The technique of vacuum plasma spraying (VPS) was used for this purpose. The coating was physically and electrochemically characterized. The minimum thickness that can be achieved is 13.5 µm. After surface modification the coating has an interfacial contact resistance (ICR) of less than 10 mΩ cm2 under 140 N cm-2, which meets the DOE 2015 target for BPP of PEM fuel cells. Corrosion measurements were performed in simulated environment of PEMWE. Figure 2 presents the potentiodynamic polarization curves of the uncoated and coated stainless steel substrate (ss) with titanium (Ti/ss). The characteristic of Ti/ss was measured after a constant polarisation at 2 V vs. RHE for 24 h and neither corrosion of the ss substrate nor oxygen evolution on the sample was observed. Moreover, the current transients were highly dependent on the surface finishing of the coating but the protection offered to the substrate remained. XPS measurements showed that the oxidation of the coating occurs as a result of the anodization process in acid medium and not during the thermal spraying deposition. Given the superior characteristics of the coating, it might have a large impact on the cost of PEMWE systems for large scale electricity storage from renewables.

elib-URL des Eintrags:https://elib.dlr.de/93686/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Cost Reduction of large scale PEM Electrolysers by New Electro-catalysts and Bipolar Plates
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Gago, Aldoaldo.gago (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wang, Lili.wang (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Biermann, Katharinakatharina.biermann (at) dlr.NICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hosseini, Seyed Schwanseyed.hosseini (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Gazdzicki, Pawelpawel.gazdzicki (at) dlr.dehttps://orcid.org/0000-0002-5728-7861NICHT SPEZIFIZIERT
Friedrich, K. Andreasandreas.friedrich (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:11 Dezember 2015
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Polymer electrolysis, hydrogen generation, cost reduction
Veranstaltungstitel:EmHyTec 2014
Veranstaltungsort:Taormina, Italien
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:8 Dezember 2014
Veranstaltungsende:12 Dezember 2014
HGF - Forschungsbereich:Energie
HGF - Programm:Rationelle Energieumwandlung und Nutzung (alt)
HGF - Programmthema:Brennstoffzelle (alt)
DLR - Schwerpunkt:Energie
DLR - Forschungsgebiet:E EV - Energieverfahrenstechnik
DLR - Teilgebiet (Projekt, Vorhaben):E - Elektrochemische Prozesse (alt)
Standort: Stuttgart
Institute & Einrichtungen:Institut für Technische Thermodynamik > Elektrochemische Energietechnik
Hinterlegt von: Friedrich, Prof.Dr. Kaspar Andreas
Hinterlegt am:17 Dez 2014 17:26
Letzte Änderung:24 Apr 2024 19:59

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