3D FIB Reconstruction And Characterisation Of
A SOFC Electrode
Author(s)
S. Chupin, N. Vivet, D. Rochais & E. Bruneton
Abstract
SOFC (Solid Oxide Fuel Cells) appear to be a great alternative way to produce
electricity from hydrogen with high efficiency and no greenhouse gas emissions.
SOFC are efficient at high temperatures (around 800°C) and are meant to be
used for stationary applications as heat and electric co-generation devices. To
understand how gases, electricity and heat flow through these media and to
improve their efficiency, it is critical to know the actual microstructure of these
electrodes. The studied electrodes are Ni-YSZ cermets in which characteristic
element sizes are around 1m. The 3D microstructure has been reconstructed
using FIB (Focused Ion Beam) tomography. This technique has been used on
several samples (different Ni-YSZ proportions) and gives representative 3D
volumes of around 10×10×10μm with a 10nm resolution. Theses 3D volumes are
then analysed to extract some important structural parameters such as volumetric
proportions, active surfaces, connectivity of each components and \“three phase
boundaries” (TPB). Then, the 3D reconstructed volumes have been used to
determine homogeneous media equivalent properties such as thermal, ionic and
electric conductivities. These homogeneous equivalent properties are estimated
using a hot guarded plate simulation that takes into account each component
properties and the 3D structure.
Keywords: SOFC, FIB, tomography, thermal conductivity.
1 Introduction
Solid oxide fuel cell (SOFC) based-technology is one of the most promising
energy conversion systems due to its high efficiency and fuel flexibility [1]. The
materials involved in their constitution have become increasingly sophisticated,
both in composition and microstructure. One of the most common anode
Keywords
SOFC, FIB, tomography, thermal conductivity
Related Book
Other papers in this volume
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