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Developing Contacting Solutions for Mg2Si1–xSnx-Based Thermoelectric Generators: Cu and Ni45Cu55 as Potential Contacting Electrodes

Ayachi, Sahar und Castillo Hernandez, Gustavo und Pham, Ngan Hoang und Farahi, Nader und Müller, Eckhard und de Boor, Johannes (2019) Developing Contacting Solutions for Mg2Si1–xSnx-Based Thermoelectric Generators: Cu and Ni45Cu55 as Potential Contacting Electrodes. ACS Applied Materials and Interfaces. American Chemical society (ACS). doi: 10.1021/acsami.9b12474. ISSN 1944-8244.

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Kurzfassung

Magnesium silicides can be used for thermoelectric energy conversion as high values of figure of merit zT were obtained for n-type (1.4 at 500 °C) and p-type (0.55 at 350 °C) materials. This, however, needs to be complemented by low resistive and stable contacting to ensure long-term thermogenerator operation and minimize losses. In this study, we selected Cu and Ni45Cu55 as contacting electrodes for their high electrical conductivity, similar coefficient of thermal expansion (CTE), and good adhesion to Mg2(Si,Sn). Both electrodes were joined to Mg2Si0.3Sn0.7 pellets by hot pressing in a current-assisted press. Microstructural changes near the interface were analyzed using SEM/EDX analysis, and the specific electrical contact resistance rc was estimated using a traveling potential probe combined with local Seebeck scanning. Good contacting was observed with both electrode materials. Results show low rc with Cu, suitable for applications, for both n- and p-type silicides (<10 μΩ·cm2), with the occurrence of wide, highly conductive diffusion regions. Ni45Cu55 joining also showed relatively low rc values (∼30 μΩ·cm2) for n- and p-type but had a less inhomogeneous reaction layer. We also performed annealing experiments with Cu-joined samples at 450 °C for 1 week to investigate the evolution of the contact regions under working temperatures. rc values increased (up to ∼100 μΩ·cm2) for annealed n-type samples but remained low (<10 μΩ·cm2) for p-type. Therefore, Cu is a good contacting solution for p-type Mg2(Si,Sn) and a potential one for n-type if the diffusion causing contact property degradation can be prevented.

elib-URL des Eintrags:https://elib.dlr.de/130575/
Dokumentart:Zeitschriftenbeitrag
Titel:Developing Contacting Solutions for Mg2Si1–xSnx-Based Thermoelectric Generators: Cu and Ni45Cu55 as Potential Contacting Electrodes
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Ayachi, SaharGerman aerospace center, institute of materials research, köln, germanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Castillo Hernandez, GustavoGerman aerospace center, institute of materials research, köln, germanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Pham, Ngan HoangGerman aerospace center, institute of materials research, köln, germanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Farahi, NaderGerman aerospace center, Institute of materials research, Köln, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Müller, EckhardGerman aerospace center, Institute of materials research, Köln, Germany and Institute for inorganic and analytical chemistry, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 58, 35392 Gießen, GermanyNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
de Boor, Johannesgerman aerospace center, institute of materials research, köln, germanyhttps://orcid.org/0000-0002-1868-3167NICHT SPEZIFIZIERT
Datum:17 Oktober 2019
Erschienen in:ACS Applied Materials and Interfaces
Referierte Publikation:Ja
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1021/acsami.9b12474
Verlag:American Chemical society (ACS)
ISSN:1944-8244
Status:veröffentlicht
Stichwörter:Thermoelectrics; contacting; interface; electrical contact resistance; annealing
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Straßenverkehr
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V ST Straßenverkehr
DLR - Teilgebiet (Projekt, Vorhaben):V - NGC Antriebssystem und Energiemanagement (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Thermoelektrische Materialien und Systeme
Hinterlegt von: Yasseri, Mohammad
Hinterlegt am:15 Nov 2019 15:18
Letzte Änderung:08 Nov 2023 08:15

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