Abstract
Patterned Ni anodes are a common method to determine elementary kinetic reaction mechanism at the anode of Solid Oxide Fuel Cells. Their well defined Triple-Phase-Boundary (TPB) of electrode, electrolyte and gas phase, where the electrochemical oxidation takes place, is easily accessible. However, the direct transfer of knowledge gained with patterned Ni anodes to technical Ni/8YSZ cermet anodes is doubtful. For the first time a comparison of the electrochemical performance of both anode concepts is performed by means of (i) transmission line model calculations and (ii) performance simulations using a 3D FEM microstructure model. The good agreement observed between the performance of patterned Ni anodes and Ni/8YSZ cermet anodes indicates similar reaction mechanisms at the TPB of both anode concepts. Especially in H2-H2O atmosphere, the agreement of (i) absolute ASR values and (ii) parameter dependencies is very good and shows the applicability of patterned Ni anodes for the investigation of the electrochemistry of technical Ni/8YSZ cermet anodes.
Published Version
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