Journal Article

FZJ-2017-08483

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Impact of defect chemistry on cathode performance: A case study of Pr-doped ceria

Lenser, C. (Corresponding author)FZJ* ; Gunkel, F.FZJ* ; Sohn, Y. J.FZJ* ; Menzler, N. H.FZJ*

2018
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.ssi.2017.09.023

Abstract: Pr-doped ceria (PCO) is a mixed ionic-electronic conductor (MIEC) under oxidizing conditions, with excellent ionic and relatively low electronic conductivity. Motivated by investigations of model systems, PCO is examined with regards to the performance as an SOFC air electrode. The conductivity of Pr0.2Ce0.8O2‐δ (20PCO) in air is examined in detail, and a novel technique based on high-temperature X-ray diffraction (HT-XRD) to identify the exact temperature at which half of all Pr-dopants are ionized is presented. The redox-state of the Pr dopants strongly influences the polaron mobility, which can be linked to an increase of the polarization resistance of symmetric cells with 20PCO electrodes, indicating a change of the rate-limiting step for the oxygen reduction reaction (ORR).

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. Elektronische Materialien (PGI-7)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 524 - Controlling Collective States (POF3-524) (POF3-524)

Appears in the scientific report 2018

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

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