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Publications (10 of 224) Show all publications
Leisner, P. (2024). 15th EDNANO (International Workshop on Electrodeposited Nanostructures) integrating EAST Forum 2023. Transactions of the Institute of Metal Finishing
Open this publication in new window or tab >>15th EDNANO (International Workshop on Electrodeposited Nanostructures) integrating EAST Forum 2023
2024 (English)In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192Article in journal, Editorial material (Other academic) Epub ahead of print
Place, publisher, year, edition, pages
Taylor & Francis, 2024
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-63216 (URN)10.1080/00202967.2023.2289734 (DOI)001126031900001 ()2-s2.0-85180907826 (Scopus ID)
Available from: 2024-01-08 Created: 2024-01-08 Last updated: 2024-01-08
Mölmen, L., Fast, L., Lundblad, A., 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.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Aluminium, Electrical contact resistance, GDL, NiP, NiSn, PEMFC
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-58997 (URN)10.1016/j.jpowsour.2022.232341 (DOI)000891798000005 ()2-s2.0-85142179649 (Scopus ID)HOA;;844521 (Local ID)HOA;;844521 (Archive number)HOA;;844521 (OAI)
Funder
VinnovaEU, Horizon 2020Knowledge FoundationSwedish Foundation for Strategic Research
Available from: 2022-11-29 Created: 2022-11-29 Last updated: 2023-05-10Bibliographically approved
Leisner, P. (2023). Control of nanoparticles co-deposition and resulting microstructure in electrodeposited nickel based composite coatings. In: : . Paper presented at 15th International Workshop on Electrodeposited Nanostructures, Metz, 15-18 November 2023.
Open this publication in new window or tab >>Control of nanoparticles co-deposition and resulting microstructure in electrodeposited nickel based composite coatings
2023 (English)Conference paper, Oral presentation only (Refereed)
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-63235 (URN)
Conference
15th International Workshop on Electrodeposited Nanostructures, Metz, 15-18 November 2023
Available from: 2024-01-09 Created: 2024-01-09 Last updated: 2024-01-09Bibliographically approved
Yoa, Y., Rao, S., Mølmen, L., Westergård, R., Törne, K. B., Kubart, T., . . . Lundblad, A. (2023). Corrosion studies on coated aluminium for bipolar plates. In: : . Paper presented at Conference on solar fuels, electro fuels, green hydrogen and CO2 valorization, 24-26 October 2023, Uppsala, Sweden.
Open this publication in new window or tab >>Corrosion studies on coated aluminium for bipolar plates
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2023 (English)Conference paper, Oral presentation only (Refereed)
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:hj:diva-63236 (URN)
Conference
Conference on solar fuels, electro fuels, green hydrogen and CO2 valorization, 24-26 October 2023, Uppsala, Sweden
Available from: 2024-01-09 Created: 2024-01-09 Last updated: 2024-01-11Bibliographically approved
Zendejas Medina, L., Mølmen, L., Paschalidou, E.-M., Donzel-Gargand, O., Leisner, P., Jansson, U. & Nyholm, L. (2023). Extending the Passive Region of CrFeNi-Based High Entropy Alloys. Advanced Functional Materials, 33(51), Article ID 2307897.
Open this publication in new window or tab >>Extending the Passive Region of CrFeNi-Based High Entropy Alloys
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2023 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 33, no 51, article id 2307897Article in journal (Refereed) Published
Abstract [en]

This study provides principles for designing new corrosion resistant high entropy alloys. The theoretical framework is a percolation model developed by Newman and Sieradzki that predicts the ability of an alloy to passivate, i.e., to form a protective surface oxide, based on its composition. Here, their model is applied to more complex materials than previously, namely amorphous CrFeNiTa and CrFeNiW alloys. Furthermore, the model describes a more complex passivation process: reforming the oxide layer above the transpassive potential of Cr. The model is used to predict the lowest concentration of Ta or W required to extend the passive region, yielding 11–14 at% Ta and 14–17 at% W. For CrFeNiTa, experiments reveal a threshold value of 13–15 at% Ta, which agrees with the prediction. For CrFeNiW, the experimentally determined threshold value is 37–45 at% W, far above the predicted value. Further investigations explore why the percolation model fails to describe the CrFeNiW system; key factors are the higher nobility and the pH sensitivity of W. These results demonstrate some limitations of the percolation model and offer complementary passivation criteria, while providing a design route for combining the properties of the 3d transition metal and refractory metal groups.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
Keywords
corrosion, high entropy alloys, materials design, passivation, percolation theory, Cobalt alloys, Corrosion resistance, Entropy, Functional materials, High-entropy alloys, Iron alloys, Refractory metals, Tantalum alloys, Ternary alloys, Complex materials, Corrosion-resistant, Passivation process, Percolation models, Surface oxide, Theoretical framework, Threshold-value, Solvents
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-62497 (URN)10.1002/adfm.202307897 (DOI)001062551700001 ()2-s2.0-85170376146 (Scopus ID)HOA;;905181 (Local ID)HOA;;905181 (Archive number)HOA;;905181 (OAI)
Funder
Vinnova, 2016‐05156Knowledge FoundationSwedish Research Council, 2019‐00207
Available from: 2023-09-19 Created: 2023-09-19 Last updated: 2024-01-09Bibliographically approved
Richter, A. & Leisner, P. (2023). New key persons when research institute on precious metals turns 100 years old. Transactions of the Institute of Metal Finishing, 101(1), 2-3
Open this publication in new window or tab >>New key persons when research institute on precious metals turns 100 years old
2023 (English)In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 101, no 1, p. 2-3Article in journal, Editorial material (Other (popular science, discussion, etc.)) Published
Place, publisher, year, edition, pages
Taylor & Francis, 2023
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-63253 (URN)10.1080/00202967.2022.2149689 (DOI)000895427200001 ()
Available from: 2024-01-09 Created: 2024-01-09 Last updated: 2024-01-09Bibliographically approved
Leisner, P. (2023). The Schwabisch Gmund Prize for Young Scientists 2023. Transactions of the Institute of Metal Finishing, 101(3), 113-113, Article ID 2196841.
Open this publication in new window or tab >>The Schwabisch Gmund Prize for Young Scientists 2023
2023 (English)In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 101, no 3, p. 113-113, article id 2196841Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
Taylor & Francis, 2023
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-60345 (URN)10.1080/00202967.2023.2196841 (DOI)000972332100001 ()
Available from: 2023-05-15 Created: 2023-05-15 Last updated: 2023-05-15Bibliographically approved
Zabinski, P. & Leisner, P. (2022). 14th EDNANO (International Workshop on Electrodeposited Nanostructures) integrating 10th European Pulse Plating Seminar and EAST Forum. Transactions of the Institute of Metal Finishing, 100(5), 229-231
Open this publication in new window or tab >>14th EDNANO (International Workshop on Electrodeposited Nanostructures) integrating 10th European Pulse Plating Seminar and EAST Forum
2022 (English)In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 100, no 5, p. 229-231Article in journal, Editorial material (Other academic) Published
Abstract [en]

The biennial conference, European Pulse Plating Seminar was scheduled to be held in early March for the tenth time as a joint event with the annual conference of the European Academy of Surface Technology, EAST Forum. The pandemic did not allow the conference to be held as planned. Instead, it was integrated with the 14th International Workshop on Electrodeposited Nanostructures (EDNANO). This became an extended event with 25 oral presentations and 16 posters. Many attendees highlighted the value of again being able to meet and interact at a physically attended scientific event. The conference had 44 attendees from 11 different countries.

Place, publisher, year, edition, pages
Taylor & Francis, 2022
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-58151 (URN)10.1080/00202967.2022.2099093 (DOI)000830618500001 ()2-s2.0-85138318394 (Scopus ID)
Available from: 2022-08-09 Created: 2022-08-09 Last updated: 2022-11-25Bibliographically approved
Leisner, P. (2022). 2022 Prize and grants from European academy of surface technology. Transactions of the Institute of Metal Finishing, 100(4), 176-177
Open this publication in new window or tab >>2022 Prize and grants from European academy of surface technology
2022 (English)In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 100, no 4, p. 176-177Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
Taylor & Francis, 2022
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-57491 (URN)10.1080/00202967.2022.2079287 (DOI)000807605100001 ()2-s2.0-85131681743 (Scopus ID)
Available from: 2022-06-21 Created: 2022-06-21 Last updated: 2022-07-22Bibliographically approved
Leisner, P. & Lundstrom, M. (2022). International Process Metallurgy Symposium (IPMS) 2021. Transactions of the Institute of Metal Finishing, 100(2), 59-62
Open this publication in new window or tab >>International Process Metallurgy Symposium (IPMS) 2021
2022 (English)In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 100, no 2, p. 59-62Article in journal, Editorial material (Other academic) Published
Place, publisher, year, edition, pages
Taylor & Francis, 2022
National Category
Materials Engineering
Identifiers
urn:nbn:se:hj:diva-56024 (URN)10.1080/00202967.2022.2031077 (DOI)000759270300001 ()2-s2.0-85125817942 (Scopus ID)
Available from: 2022-03-10 Created: 2022-03-10 Last updated: 2022-12-11Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7095-1907

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