Ni-Based Solid Oxide Cell Electrodes

Mogens Bjerg Mogensen, Peter Holtappels

Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review


This paper is a critical review of the literature on nickel-based electrodes for application in solid oxide cells at temperature from 500 to 1000 _C. The applications may be fuel cells or electrolyser cells. The reviewed literature is that of experimental results on both model electrodes and practical composite cermet electrodes. A substantially longer three-phase boundary (TPB) can be obtained per unit area of cell in such a composite of nickel and electrolyte material, provided that two interwoven solid networks of the two solid and one gaseous phases are obtained to provide a three - dimensional TPB throughout the electrode volume. Variables that are used for controlling the properties of Ni-cermet electrodes are: (1) Ni/YSZ volume ratio, and (2) porosity and particle size distribution, which mainly affected by raw materials morphology, application methods and production parameters such as milling and sintering. The various electrode properties are deeply related to these parameters, but also much related to the atomic scale structure of the Ni-electrolyte interface, which in turn is affected by segregation of electrolyte components and impurities as well as poisons in the gas phase. The main emphasis will be on the following subjects: (a) electronic conductivity of cermets, (b) dimensional and thermodynamic stability including redox cycling, © thermal expansion coefficient matching, (d) chemical compatibility with stack components and gaseous reactants and (e) electrode reaction mechanism and polarisation resistance. A brief discussion of the main concepts in the modelling literature is given in context of the latter subject.
Original languageEnglish
Title of host publicationSolid Oxide Fuels Cells: Facts and Figures : Past, Present and Future Perspectives for SOFC Technologies
EditorsJohn T.S. Irvine, Paul Connor
Publication date2013
ISBN (Print)978-1-4471-4455-7
ISBN (Electronic)978-1-4471-4456-4
Publication statusPublished - 2013
SeriesGreen Energy and Technology


Dive into the research topics of 'Ni-Based Solid Oxide Cell Electrodes'. Together they form a unique fingerprint.

Cite this