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Investigation of Ni-Diffusion Properties in Ni/YSZ SOFC-Anodes via Thermal Grooving Experiments

Sunday (01.01.2040)
00:00 - 10:11
Part of:
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One of the most dominant degradation mechanisms in solid oxide fuel cells (SOFCs) is the coarsening of nickel grains in the Ni-YSZ anode under operating conditions. This leads to a loss of percolation and a reduction of the active triple-phase boundary resulting consequently in a loss of performance. The motivation of this work is to generate a fundamental understanding of the diffusion mechanisms leading to Ni coarsening and to predict this microstructural evolution by means of large-scale 3D phase-field simulations of porous Ni-YSZ microstructures.

In this work, we present the experimental approach of thermal grooving to determine the required material parameters such as diffusion coefficients and grain-boundary energies. The experiments are carried out on bi-crystalline and polycrystalline nickel samples as well as on the porous anode under variation of temperature and humidity. Atomic force microscopy is used to measure the grain-boundary thermal grooving profiles. The profiles are carefully analyzed and compared to analytical theories [1-3]. The various sample geometries enable a detailed study of the diffusion mechanisms as well as of the energy anisotropy of different grain-boundary orientations.


References: [1] W. W. Mullins, Theory of Thermal Grooving, Journal of Applied Physics 28, 333 (1957)

[2] W. W. Mullins, Grain Boundary Grooving by Volume Diffusion, Transactions of the American Institute of Mining and Metallurgical Engineers 218.2, 354 (1960)

[3] W. M. Robertson, Grain-Boundary Grooving by Surface Diffusion for Finite Surface Slopes, Journal of Applied Physics 42, 463 (1971)

Patricia Haremski
Robert Bosch GmbH
Additional Authors:
  • Matthias Wieler
    Robert Bosch GmbH
  • Anika Marusczyk
    Robert Bosch GmbH
  • Michael J. Hoffmann
    Karlsruhe Institute of Technology
  • Paul Hoffrogge
    Karlsruhe University of Applied Sciences
  • Daniel Schneider
    Karlsruhe University of Applied Sciences / Karlsruhe Institute of Technology
  • Britta Nestler
    Karlsruhe University of Applied Sciences / Karlsruhe Institute of Technology
  • Piero Lupetin
    Robert Bosch GmbH