Suitability of Pr2–xCaxNiO4+δ as cathode materials for electrochemical devices based on oxygen ion and proton conducting solid state electrolytes

In order to develop economically competitive solid oxide fuel cell (SOFC) systems it is necessary to design new functional materials with the purpose of enhancing their performance, extending operational lifetime and reducing the cost. The present work focuses on the study of Pr2-xCaxNiO4+δ cathode...

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Bibliographic Details
Published in:International journal of hydrogen energy 2020-05, Vol.45 (25), p.13612-13624
Main Authors: Pikalova, E., Kolchugin, A., Bogdanovich, N., Medvedev, D., Lyagaeva, J., Vedmid', L., Ananyev, M., Plaksin, S., Farlenkov, A.
Format: Article
Language:English
Subjects:
Anode-supported cell
Ca doping
Doped BaCeO3
Doped CeO2
Pr2NiO4
SOFC
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Summary:In order to develop economically competitive solid oxide fuel cell (SOFC) systems it is necessary to design new functional materials with the purpose of enhancing their performance, extending operational lifetime and reducing the cost. The present work focuses on the study of Pr2-xCaxNiO4+δ cathode materials prepared by a simple and cheap conventional solid state reaction method. The structure, oxygen nonstoichiometry, electrical properties and chemical compatibility of the materials with a number of well-known oxygen ion and proton conducting electrolytes were systematically investigated. Chemical composition (Ca content) and technological factors (powders pre-history, electrodes' sintering temperature), as well as external parameters (temperature, air humidity) were correlated with the electrochemical performance of the electrodes to determine the optimal compositions and conditions. Based on this study and testing results of the single anode-supported cell with BaCe0.89Gd0.1Cu0.01O3-δ electrolyte, the Pr1.7Ca0.3NiO4+δ-based electrode compositions are proposed for preferred usage in SOFCs in place of Pr2NiO4+δ electrode. [Display omitted] •Pr2-xCaxNiO4+δ was prepared by a solid state reaction method.•Materials with Ca are more compatible with solid state electrolytes.•Introducing SDC into the PCNO electrodes improves their performance.•Polarization resistance of PCNO3-BCGCu was 0.26 Ω cm2 at 700 C.•Test in SOFC mode revealed stability of the composite electrode.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2018.06.023