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Evaluation of Ni-Mo and Ni-Mo-P Electroplated Coatings on Stainless Steel for PEM Fuel Cells Bipolar Plates
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
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2016 (English)In: Fuel Cells, ISSN 1615-6846, E-ISSN 1615-6854, Vol. 16, no 6, 784-800 p.Article in journal (Refereed) Published
Abstract [en]

Stainless steel bipolar plates (BPPs) are the preferred choice for proton exchange membrane fuel cells (PEMFCs); however, a surface coating is needed to minimize contact resistance and corrosion. In this paper, Ni–Mo and Ni–Mo–P coatings were electroplated on stainless steel BPPs and investigated by XRD, SEM/EDX, AFM and contact angle measurements. The performance of the BPPs was studied by corrosion and conduction tests and by measuring their interfacial contact resistances (ICRs) ex situ in a PEMFC set-up at varying clamping pressure, applied current and temperature. The results revealed that the applied coatings significantly reduce the ICR and corrosion rate of stainless steel BPP. All the coatings presented stable performance and the coatings electroplated at 100 mA cm−2showed even lower ICR than graphite. The excellent properties of the coatings compared to native oxide film of the bare stainless steel are due to their higher contact angle, crystallinity and roughness, improving hydrophobicity and electrical conductivity. Hence, the electroplated coatings investigated in this study have promising properties for stainless steel BPPs and are potentially good alternatives for the graphite BPP in PEMFC.

Place, publisher, year, edition, pages
John Wiley & Sons, 2016. Vol. 16, no 6, 784-800 p.
Keyword [en]
Alloys, Bipolar Plate, Electroplated Coatings, Fuel Cells, Interfacial Contact Resistance, Molybdenum, PEM Fuel Cell, Wettability, Alloying, Coatings, Contact angle, Contact resistance, Corrosion, Corrosion rate, Gas fuel purification, Graphite, Nickel, Oxide films, Proton exchange membrane fuel cells (PEMFC), Wetting, Bipolar plates, Electrical conductivity, Electroplated coating, Proton exchange membrane fuel cell (PEMFCs), Stable performance, Stainless steel bipolar plates, Stainless steel
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-201882DOI: 10.1002/fuce.201600062ISI: 000392531900014Scopus ID: 2-s2.0-84992349867OAI: oai:DiVA.org:kth-201882DiVA: diva2:1079319
Note

QC 20170308

Available from: 2017-03-08 Created: 2017-03-08 Last updated: 2017-03-08Bibliographically approved

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Rashtchi, H.Acevedo Gomez, Y.Lagergren, CarinaLindström, Rakel
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