Quantitative relationships between composition, particle size, triple phase boundary length and surface area in nickel-cermet anodes for solid oxide fuel cells

Holzer, Lorenz; Münch, Beat; Iwanschitz, Boris; Cantoni, Marco; Hocker, Thomas; Graule, Thomas

doi:10.1016/j.jpowsour.2010.08.006

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Quantitative relationships between composition, particle size, triple phase boundary length and surface area in nickel-cermet anodes for solid oxide fuel cells
Authors:	Holzer, Lorenz Münch, Beat Iwanschitz, Boris Cantoni, Marco Hocker, Thomas Graule, Thomas
DOI:	10.1016/j.jpowsour.2010.08.006
Published in:	Journal of Power Sources
Volume(Issue):	196
Issue:	17
Page(s):	7076
Pages to:	7089
Issue Date:	1-Sep-2011
Publisher / Ed. Institution:	Elsevier
ISSN:	0378-7753 1873-2755
Language:	English
Subjects:	Fuel cell; Microstructure; Electrochemical activity; SOFC
Subject (DDC):	540: Chemistry 621.3: Electrical, communications, control engineering
Abstract:	The present study is focusing on the elaboration of the quantitative relationships between the primary microstructural parameters (i.e. the phase volume fractions Φ, the particle and pore sizes and the corresponding size distributions PSD) with the more complex topological features (triple phase boundary length TPBL, and specific surface area SSA) in porous Ni-cermet anodes. These relationships are crucial for the microstructure optimization and for the improvement of the corresponding electrode performance. In the first part of the study a pristine anode material with a graded microstructure is analyzed. The results from the different zonations indicate that the TPBL correlates well with the volume fraction of the coarsest phase which is nickel. However the volume fractions also correlate with the particle size after sintering due to stronger particle coalescence at higher nickel volume fractions. Since the larger particle size leads to a decrease of the TPBL this coarsening effect partly neutralizes the advantage of a higher nickel volume fraction. Furthermore, the TPBL is also linked with the nickel surface area and with the corresponding pore-nickel interface area. The pore-nickel interface is the least abundant internal surface and therefore it represents the microstructural feature which predominantly limits the TPB formation in our nickel-cermet anode. In the second part the effects of microstructural degradation during exposure in a humid gas environment at 950°C are investigated. During the early period (1000 h) the nickel coarsening ceases whereas the decrease of the TPBL continues at a lower rate. During longer exposure time the reduction of TPBL is most probably caused by a slight volatilization of the nickel phase and by the formation of continuous CGO layers which are shielding the surface of the nickel grains.
URI:	https://digitalcollection.zhaw.ch/handle/11475/1670
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Holzer, L., Münch, B., Iwanschitz, B., Cantoni, M., Hocker, T., & Graule, T. (2011). Quantitative relationships between composition, particle size, triple phase boundary length and surface area in nickel-cermet anodes for solid oxide fuel cells. Journal of Power Sources, 196(17), 7076–7089. https://doi.org/10.1016/j.jpowsour.2010.08.006

Holzer, L. et al. (2011) ‘Quantitative relationships between composition, particle size, triple phase boundary length and surface area in nickel-cermet anodes for solid oxide fuel cells’, Journal of Power Sources, 196(17), pp. 7076–7089. Available at: https://doi.org/10.1016/j.jpowsour.2010.08.006.

L. Holzer, B. Münch, B. Iwanschitz, M. Cantoni, T. Hocker, and T. Graule, “Quantitative relationships between composition, particle size, triple phase boundary length and surface area in nickel-cermet anodes for solid oxide fuel cells,” Journal of Power Sources, vol. 196, no. 17, pp. 7076–7089, Sep. 2011, doi: 10.1016/j.jpowsour.2010.08.006.

HOLZER, Lorenz, Beat MÜNCH, Boris IWANSCHITZ, Marco CANTONI, Thomas HOCKER und Thomas GRAULE, 2011. Quantitative relationships between composition, particle size, triple phase boundary length and surface area in nickel-cermet anodes for solid oxide fuel cells. Journal of Power Sources. 1 September 2011. Bd. 196, Nr. 17, S. 7076–7089. DOI 10.1016/j.jpowsour.2010.08.006

Holzer, Lorenz, Beat Münch, Boris Iwanschitz, Marco Cantoni, Thomas Hocker, and Thomas Graule. 2011. “Quantitative Relationships between Composition, Particle Size, Triple Phase Boundary Length and Surface Area in Nickel-Cermet Anodes for Solid Oxide Fuel Cells.” Journal of Power Sources 196 (17): 7076–89. https://doi.org/10.1016/j.jpowsour.2010.08.006.

Holzer, Lorenz, et al. “Quantitative Relationships between Composition, Particle Size, Triple Phase Boundary Length and Surface Area in Nickel-Cermet Anodes for Solid Oxide Fuel Cells.” Journal of Power Sources, vol. 196, no. 17, Sept. 2011, pp. 7076–89, https://doi.org/10.1016/j.jpowsour.2010.08.006.