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Publications (3 of 3) Show all publications
Mölmen, L., Fast, L., Lundblad, A. O., Eriksson, P. & Leisner, P. (2023). Contact resistance measurement methods for PEM fuel cell bipolar plates and power terminals. Journal of Power Sources, 555, Article ID 232341.
Open this publication in new window or tab >>Contact resistance measurement methods for PEM fuel cell bipolar plates and power terminals
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2023 (English)In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 555, article id 232341Article in journal (Refereed) Published
Abstract [en]

The electrical contact resistance is a key parameter for optimising both the bipolar plate of the polymer electrolyte membrane fuel cell (PEMFC) and the electrical contact of the power terminal of the stack. The contact resistance is affected by the conductivity, roughness, and hardness of the two contacting surfaces. Here, new, application-specific contact resistance measurement methods are proposed for both the stack power terminal, and the bipolar plate. The proposed methods are compared to methods from references as well as standards, and it is concluded that the uncertainty of the measurements can be reduced by changing the measurement setup, and that the influence of probe resistance on measurement results can be eliminated. Furthermore, the effect of different accelerated durability tests on the contact resistance of the power terminal is examined both on test coupons and on a prototype screw connection with an electroless NiP and an electroplated NiSn coatings. As expected, the NiSn coupons gives lower contact resistance after ageing as compared to the NiP. However, the increase in contact resistance seen on coupons after ageing is not observed on the prototype screw connection. © 2022 The Author(s)

Place, publisher, year, edition, pages
Elsevier B.V., 2023
Keywords
Aluminium, Electrical contact resistance, GDL, NiP, NiSn, PEMFC, Binary alloys, Current voltage characteristics, Durability, Electric contacts, Electric resistance measurement, Polyelectrolytes, Proton exchange membrane fuel cells (PEMFC), Screws, Uncertainty analysis, Bipolar-plates, Electrical contacts, Keys parameters, Measurement methods, PEM fuel cell, Power terminals, Resistance measurement, Screw connections, Contact resistance
National Category
Energy Engineering
Identifiers
urn:nbn:se:ri:diva-61352 (URN)10.1016/j.jpowsour.2022.232341 (DOI)2-s2.0-85142179649 (Scopus ID)
Note

Funding details: Horizon 2020 Framework Programme, H2020; Funding details: H2020 Marie Skłodowska-Curie Actions, MSCA, 764977; Funding details: Stiftelsen för Strategisk Forskning, SSF, ARC19-0026; Funding details: Stiftelsen för Kunskaps- och Kompetensutveckling, KKS; Funding details: Horizon 2020; Funding text 1: This work has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 764977, Swedish Foundation for Strategic Research (Project No. ARC19-0026), the ALUSAP project within the strategic innovation programme Metallic materials funded by Vinnova, Formas and Energimyndigheten, the Smart Industry Sweden project funded by the Swedish Knowledge Foundation. The authors would like to thank LPTech AB for performing the coating of the samples and Powercell AB for their input on the project.; Funding text 2: This work has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 764977 , Swedish Foundation for Strategic Research (Project No. ARC19-0026 ), the ALUSAP project within the strategic innovation programme Metallic materials funded by Vinnova , Formas and Energimyndigheten , the Smart Industry Sweden project funded by the Swedish Knowledge Foundation .

Available from: 2022-12-09 Created: 2022-12-09 Last updated: 2024-05-20Bibliographically approved
Assenhöj, M., Eriksson, P., Dönnes, P., Ljunggren, S., Marcusson-Ståhl, M., Du Rietz, A., . . . Cederbrant, K. (2021). Protein interaction, monocyte toxicity and immunogenic properties of cerium oxide crystals with 5% or 14% gadolinium, cobalt oxide and iron oxide nanoparticles–an interdisciplinary approach. Nanotoxicology, 15(8), 1035-1038
Open this publication in new window or tab >>Protein interaction, monocyte toxicity and immunogenic properties of cerium oxide crystals with 5% or 14% gadolinium, cobalt oxide and iron oxide nanoparticles–an interdisciplinary approach
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2021 (English)In: Nanotoxicology, ISSN 1743-5390, E-ISSN 1743-5404, Vol. 15, no 8, p. 1035-1038Article in journal (Refereed) Published
Abstract [en]

Metal oxide nanoparticles are widely used in both consumer products and medical applications, but the knowledge regarding exposure-related health effects is limited. However, it is challenging to investigate nanoparticle interaction processes with biological systems. The overall aim of this project was to improve the possibility to predict exposure-related health effects of metal oxide nanoparticles through interdisciplinary collaboration by combining workflows from the pharmaceutical industry, nanomaterial sciences, and occupational medicine. Specific aims were to investigate nanoparticle-protein interactions and possible adverse immune reactions. Four different metal oxide nanoparticles; CeOx nanocrystals with 5% or 14% Gd, Co3O4, and Fe2O3, were characterized by dynamic light scattering and high-resolution transmission electron microscopy. Nanoparticle-binding proteins were identified and screened for HLA-binding peptides in silico. Monocyte interaction with nanoparticle–protein complexes was assessed in vitro. Herein, for the first time, immunogenic properties of nanoparticle-binding proteins have been characterized. The present study indicates that especially Co3O4-protein complexes can induce both ‘danger signals’, verified by the production of inflammatory cytokines and simultaneously bind autologous proteins, which can be presented as immunogenic epitopes by MHC class II. The clinical relevance of these findings should be further evaluated to investigate the role of metal oxide nanoparticles in the development of autoimmune disease. The general workflow identified experimental difficulties, such as nanoparticle aggregate formation and a lack of protein-free buffers suitable for particle characterization, protein analyses, as well as for cell studies. This confirms the importance of future interdisciplinary collaborations. © 2021 The Author(s). 

Place, publisher, year, edition, pages
Taylor and Francis Ltd., 2021
Keywords
immunotoxicity, Metal oxide, nanoparticle, protein corona
National Category
Physical Chemistry
Identifiers
urn:nbn:se:ri:diva-56716 (URN)10.1080/17435390.2021.1966115 (DOI)2-s2.0-85114044484 (Scopus ID)
Available from: 2021-10-01 Created: 2021-10-01 Last updated: 2024-05-20Bibliographically approved
Eriksson, P. & Carlsson, B. (1998). Accelerated corrosion test involving alternate exposure for hostile gases, neutral salt spray and drying. SP method 2499 (ed.).
Open this publication in new window or tab >>Accelerated corrosion test involving alternate exposure for hostile gases, neutral salt spray and drying. SP method 2499
1998 (English)Report (Refereed)
Publisher
p. 20
Series
SP Rapport, ISSN 0284-5172 ; 1998:44
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-4443 (URN)494 (Local ID)91-7848-751-X (ISBN)494 (Archive number)494 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2024-05-20Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3996-0394

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