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Effects of conducting oxide barrier layers on the stability of Crofer® 22 APU/Ca3Co4O9 interfaces

Published online by Cambridge University Press:  11 November 2014

Tim C. Holgate Open the ORCID record for Tim C. Holgate [Opens in a new window] ,
Li Han ,
NingYu Wu ,
Ngo Van Nong  and
Nini Pryds
Tim C. Holgate*
Affiliation:
Department of Energy Conversion and Storage, Technical University of Denmark—Risø Campus, DK4000 Roskilde, Denmark
Li Han
Affiliation:
Department of Energy Conversion and Storage, Technical University of Denmark—Risø Campus, DK4000 Roskilde, Denmark
NingYu Wu
Affiliation:
Department of Energy Conversion and Storage, Technical University of Denmark—Risø Campus, DK4000 Roskilde, Denmark
Ngo Van Nong
Affiliation:
Department of Energy Conversion and Storage, Technical University of Denmark—Risø Campus, DK4000 Roskilde, Denmark
Nini Pryds
Affiliation:
Department of Energy Conversion and Storage, Technical University of Denmark—Risø Campus, DK4000 Roskilde, Denmark
*
a)Address all correspondence to this author. e-mail: timholgate@hotmail.com
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Abstract

Practical implementation of oxide thermoelectrics on an industrial or commercial scale for waste heat energy conversion requires the development of chemically stable interfaces between metal interconnects and oxide thermoelements that exhibit low electrical contact resistances. A commercially available high-chrome iron alloy (i.e., Crofer® 22 APU) serving as the interconnect metal was spray coated with LaNi0.6Fe0.4O3 (LNFO) or (Mn,Co)3O4 spinel and then interfaced with a p-type thermoelectric material—calcium cobaltate (Ca3Co4O9)—using spark plasma sintering. The interfaces have been characterized in terms of their thermal and electronic transport properties and chemical stability. With long-term exposure of the interfaced samples to 800 °C in air, the cobalt–manganese spinel acted as a diffusion barrier between the Ca3Co4O9 and the Crofer® 22 APU alloy resulting in improved interfacial stability compared to that of samples containing LNFO as a barrier layer, and especially those without any barrier. The initial area specific interfacial resistance of the Ca3Co4O9/(Mn,Co)3O4/Crofer® 22 APU interface at 800 °C was found to be ∼1 mΩ·cm2.

Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 23 , 14 December 2014 , pp. 2891 - 2897
Copyright
Copyright © Materials Research Society 2014 

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References

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