SOFC Modelling and Parameter Identification by Means of Impedance Spectroscopy
SOFC Modelling and Parameter Identification by Means of Impedance Spectroscopy

Author: André Leonide

Publisher: KIT Scientific Publishing

Published: 2010

Total Pages: 168

ISBN-13: 3866445385

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A high resolution electrochemical impedance spectroscopy study on anode supported single cells (ASC) is presented. The cells were characterised over a broad range of operating conditions, including different temperatures, current densities and various cathode and anode gas compositions.The analysis of the distribution of relaxation times combined with the numeric accuracy of a CNLS fit enabled the identification of five different processes contributing to the total polarisation loss of an ASC.

Impedance in Electrochemistry — From Analytical Applications to Mechanistic Speculation 2
Impedance in Electrochemistry — From Analytical Applications to Mechanistic Speculation 2

Author: P. Vanýsek

Publisher: The Electrochemical Society

Published: 2009-10

Total Pages: 167

ISBN-13: 1566777623

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Impedance spectroscopy, as a method, is becoming a fixture of the instrumental arsenal. However, due to its complexity, the interpretation of impedance results is far from commonplace. The aim of this symposium was to provide forum for new approaches and uses (the Analytical Speculations part) as well as for rigorous attempt at the interpretation, going all the way to the fundamental mechanistic cause and effect.

The Electrochemical Oxidation of H2 and CO at Patterned Ni Anodes of SOFCs
The Electrochemical Oxidation of H2 and CO at Patterned Ni Anodes of SOFCs

Author: Annika Utz

Publisher: KIT Scientific Publishing

Published: 2014-08-22

Total Pages: 166

ISBN-13: 3866446861

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In this work, a deeper understanding of the electrochemical oxidation at SOFC anodes was gained by the experimental characterization of patterned Ni anodes in H2-H2O and CO-CO2 atmosphere. By high resolution data analysis, the Line Specific Resistance attributed to charge transfer and its dependencies on gas composition, temperature and polarization voltage were identified. Furthermore, the comparison of the performance of patterned and cermet anodes was enabled using a transmission line model.

Microstructural Characterisation, Modelling and Simulation of Solid Oxide Fuel Cell Cathodes
Microstructural Characterisation, Modelling and Simulation of Solid Oxide Fuel Cell Cathodes

Author: Joos, Jochen

Publisher: KIT Scientific Publishing

Published: 2017-06-29

Total Pages: 246

ISBN-13: 3731506254

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This work deals with microstructural characterisation, modelling and simulation of SOFC electrodes with the goal of optimizing the electrode microstructures. Methods for a detailed electrode analysis based on focused ion beam (FIB) tomography are presented. A 3D FEM model able to perform simulations of LSCF cathodes based on 3D tomography data is shown. A model generating realistic, yet synthetic microstructures is presented that enables the optimization of microstructural characteristics.

Physically based Impedance Modelling of Lithium-Ion Cells
Physically based Impedance Modelling of Lithium-Ion Cells

Author: Illig, Joerg

Publisher: KIT Scientific Publishing

Published: 2014-09-19

Total Pages: 231

ISBN-13: 3731502461

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In this book, a new procedure to analyze lithium-ion cells is introduced. The cells are disassembled to analyze their components in experimental cell housings. Then, Electrochemical Impedance Spectroscopy, time domain measurements and the Distribution function of Relaxation Times are applied to obtain a deep understanding of the relevant loss processes. This procedure yields a notable surplus of information about the electrode contributions to the overall internal resistance of the cell.

Finite Element Method (FEM) Model and Performance Analysis of Solid Oxide Fuel Cells
Finite Element Method (FEM) Model and Performance Analysis of Solid Oxide Fuel Cells

Author: Geisler, Helge Ingolf

Publisher: KIT Scientific Publishing

Published: 2019-07-10

Total Pages: 292

ISBN-13: 3731508958

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This work presents a numerical FEM framework, capable of predicting SOFC performance under technically relevant, planar stack contacting conditions. A high level of confidence in the model predictions is supplied by using exclusively experimentally determined material/kinetic parameters and by a comprehensive validation. The presented model aids SOFC stack development by pre-evaluating possible material choices and design combinations for cells/interconnectors without any experimental effort.

Advances in Medium and High Temperature Solid Oxide Fuel Cell Technology
Advances in Medium and High Temperature Solid Oxide Fuel Cell Technology

Author: Marta Boaro

Publisher: Springer

Published: 2016-11-24

Total Pages: 347

ISBN-13: 331946146X

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In this book well-known experts highlight cutting-edge research priorities and discuss the state of the art in the field of solid oxide fuel cells giving an update on specific subjects such as protonic conductors, interconnects, electrocatalytic and catalytic processes and modelling approaches.Fundamentals and advances in this field are illustrated to help young researchers address issues in the characterization of materials and in the analysis of processes, not often tackled in scholarly books.

Characterization and Modeling of Electrochemical Energy Conversion Systems by Impedance Techniques
Characterization and Modeling of Electrochemical Energy Conversion Systems by Impedance Techniques

Author: Dino Klotz

Publisher: KIT Scientific Publishing

Published: 2014-07-30

Total Pages: 182

ISBN-13: 3866449038

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This thesis introduces (i) amendments to basic electrochemical measurement techniques in the time and frequency domain suitable for electrochemical energy conversion systems like fuel cells and batteries, which enable shorter measurement times and improved precision in both measurement and parameter identification, and (ii) a modeling approach that is able to simulate a technically relevant system just by information gained through static and impedance measurements of laboratory size cells.

Model-based Interpretation of the Performance and Degradation of Reformate Fueled Solid Oxide Fuel Cells
Model-based Interpretation of the Performance and Degradation of Reformate Fueled Solid Oxide Fuel Cells

Author: Alexander Kromp

Publisher: KIT Scientific Publishing

Published: 2014-05-12

Total Pages: 146

ISBN-13: 373150006X

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Solid oxide fuel cells offer great prospects for the sustainable, clean and safe conversion of various fuels into electrical energy. In this thesis, the performance-determining loss processes for the cell operation on reformate fuels are elucidated via electrochemical impedance spectroscopy. Model-based analyses reveal the electrochemical fuel oxidation mechanism, the coupling of fuel gas transport and reforming chemistry and the impact of fuel impurities on the degradation of each loss process.

Electrochemical Performance and Stability of Ba₀.₅Sr₀.₅Co₀.₈Fe₀.₂O₃₋δ for Oxygen Transport Membranes
Electrochemical Performance and Stability of Ba₀.₅Sr₀.₅Co₀.₈Fe₀.₂O₃₋δ for Oxygen Transport Membranes

Author: Niedrig, Christian

Publisher: KIT Scientific Publishing

Published: 2015-12-23

Total Pages: 206

ISBN-13: 3731504375

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Mixed ionic-electronic conducting (MIEC) ceramics as oxygen transport membranes (OTMs) can provide high oxygen permeation rates at comparably low energy demands. For this purpose, Ba?.?Sr?.?Co?.?Fe?.?O??? (BSCF) shows the best performance under ideal operating conditions. Thermal and chemical stability investigations, electrical behavior ?(T,pO?,t), and oxygen exchange parameter extraction by means of electrical conductivity relaxation resulted in a far better understanding of the BSCF system.