Electrode reconstruction by FIB/SEM and microstructure modeling

• Verfasst von: Joos, Jochen [VerfasserIn]
• Verfasst von: Carraro, Thomas [VerfasserIn]
• Titel: Electrode reconstruction by FIB/SEM and microstructure modeling
• Verf.angabe: Jochen Joos, Bernd Rüger, Thomas Carraro, André Weber, Ellen Ivers-Tiffée
• Umfang: 12 S.
• Fussnoten: Gesehen am 11.03.2019
• Titel Quelle: Enthalten in: Electrochemical Society: ECS transactions
• Jahr Quelle: 2010
• Band/Heft Quelle: 28(2010), 11, S. 81-91
• ISSN Quelle: 1938-6737
• DOI: doi:10.1149/1.3495834
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1588540138

Abstract

Polarization losses within solid oxide fuel cell electrodes are strongly related to microstructure characteristics and composition. High-resolution microstructure analysis is a sensible method to understand and improve electrode performance. This study presents the application of a dual-beam focused ion beam/scanning electron microscope (FIB/SEM) for the three-dimensional (3D) reconstruction of a high performance LSCF-cathode. Error sources arising from FIB slicing and SEM sequencing are identified and methods of correction are presented. The corrected reconstruction data representing altogether a volume of ~ 2800µm3 are the basis for the calculation of the microstructure parameters (i) surface area, (ii) volume/porosity fraction and (iii) tortuosity. These parameters constitute the basis to calculate cathode performance via simplified microstructure models (1-3). Furthermore we present a detailed 3D finite element method (FEM) model to calculate the tortuosity from the accurately reconstructed 3D FIB/SEM data. This model has been extended to calculate electrode performance (ASRcat) from the 3D reconstruction.