Journal Article

FZJ-2019-05652

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Comparison of solid oxide fuel cell (SOFC) electrolyte materials for operation at 500 °C

Zhang, J. (Corresponding author)FZJ* ; Lenser, C.FZJ* ; Menzler, N. H.FZJ* ; Guillon, O.FZJ*

2020
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/23925  doi:10.1016/j.ssi.2019.115138

Abstract: Solid oxide fuel cells (SOFCs) operating at low temperature (~500 °C) enable new fields of application, such as auxiliary power units (APUs) or power generation for mobile applications. However, the state-of-the-art electrolyte material currently used in intermediate-temperature SOFCs (yttria-stabilized zirconia (YSZ)) does not provide sufficiently high ionic conductivity for low temperature applications. When looking for alternatives, the conductivity values for each material found in widely cited literature can be confusing, as the reported values are sometimes in conflict with each other. Therefore, we present a systematic comparison of the conductivity of the three most popular, commercially available electrolyte materials, i.e., YSZ, scandia-stabilized zirconia (ScSZ), and gadolinium-doped ceria (GDC). By using electrochemical impedance spectroscopy (EIS) to characterize the ionic conductivities, we find that at 500 °C, GDC has a higher ionic conductivity (5.8 × 10−3 S cm−1) than ScSZ (2.5 × 10−3 S cm−1) and YSZ (1.1 × 10−3 S cm−1). The properties of the starting powders, powder processing and the microstructure after sintering were considered. This conductivity comparison can be used as a guide when deciding on electrolyte materials for different SOFC applications, especially when the fabrication of different thickness of the electrolyte layer has to be considered and rectify misleading information in the literature.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 135 - Fuel Cells (POF3-135) (POF3-135)
2. SOFC - Solid Oxide Fuel Cell (SOFC-20140602) (SOFC-20140602)

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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