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Zacharie Wuillemin

Cette personne n’est plus à l’EPFL

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Publications associées (36)

Impact of Random Geometric Distortions on the Performance and Reliability of an SOFC

Zacharie Wuillemin, Thierry Mikaël Cornu

A method based on Monte Carlo simulations (MCS) is developed to assess the impact of manufacturing tolerances on the performance and reliability of solid oxide fuel cells (SOFCs). Computational fluid dynamics (CFD) simulations of the anode gas diffusion la ...

Wiley-Blackwell2011

Glass-Forming Exogenous Silicon Contamination in Solid Oxide Fuel Cell Cathodes

Aïcha Hessler-Wyser, Jan Van Herle, Zacharie Wuillemin, Josef Andreas Schuler

Spatially resolved analyses, by energy-dispersive X-ray spectroscopy (EDS) scanning electron microscopy (SEM), allowed the quantification of exogenous Si contamination in a solid oxide fuel cell (SOFC) cathode after operation. The Si quantification, taking ...

Electrochemical Society2011

Air Side Contamination in Solid Oxide Fuel Cell Stack Testing

Aïcha Hessler-Wyser, Jan Van Herle, Zacharie Wuillemin, Josef Andreas Schuler, Christian Gehrig, Christian Ludwig

Solid Oxide Fuel Cells (SOFCs) are likely candidates for electricity production with high efficiency and promise reasonable fuel tolerance. While fuel impurities are known anode poisons, less attention is brought to air-purity, especially to air-side conta ...

Elsevier2011

TEM investigation on zirconate formation and chromium poisoning in LSM/YSZ cathode

Aïcha Hessler-Wyser, Jan Van Herle, Zacharie Wuillemin, Antonin Faes, Josef Andreas Schuler

Cell durability is a crucial technological issue for SOFC commercialization, and considerable progress has been made in recent years. A number of degradation pathways have been established, amongst which microstructural changes, poisoning effects and forma ...

Springer Verlag2011

Electrochemical Model of Solid Oxide Fuel Cell for Simulation at the Stack Scale I. Calibration Procedure on Experimental Data

Stefan Diethelm, Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo

Lifetime prediction and improvement of solid oxide fuel cell (SOFC) devices require a reliable electrochemical model that supports the implementation of degradation phenomena. This study comprises two parts. This Part I describes the calibration of an elec ...

2011

Experimental Real-Time Optimization of a Solid Oxide Fuel Cell Stack via Constraint Adaptation

Dominique Bonvin, Zacharie Wuillemin, Arata Nakajo, Grégory François, Leonidas Tsikonis, Gene Bunin

The experimental validation of a real-time optimization (RTO) strategy for the optimal operation of a solid oxide fuel cell (SOFC) stack is reported in this paper. Unlike many existing studies, the RTO approach presented here utilizes the constraint-adapta ...

2010

Air Side Contamination in SOFC Stack Testing

Aïcha Hessler-Wyser, Jan Van Herle, Zacharie Wuillemin, Josef Andreas Schuler, Christian Gehrig, Christian Ludwig

2010

Simulation of thermal stresses in anode-supported solid oxide fuel cell stacks. Part II: Loss of gas-tightness, electrical contact and thermal buckling

Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo

Structural stability issues in planar solid oxide fuel cells arise from the mismatch between the coefficients of thermal expansion of the components. The stress state at operating temperature is the superposition of several contributions, which differ depe ...

2009

Experimental and modeling investigations on local performance and local degradation in solid oxide fuel cells

Zacharie Wuillemin

This thesis focuses on performance, reliability and degradation in solid oxide fuel cells (SOFC), which currently represent the three key technical challenges for the deployment of this technology. By its development of dedicated modeling and experimental ...

EPFL2009

Simulation of thermal stresses in anode-supported solid oxide fuel cell stacks. Part I: Probability of failure of the cells

Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo

2009

Modeling and Study of the Influence of Sealing on a Solid Oxide Fuel Cell

Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Minh-Tâm Luong, Nordahl Autissier

The properties of sealing materials are important for the performance and reliability of solid oxide fuel cells (SOFCs). Even if the properties of a sealing material can be studied separately, it remains difficult to quantify the effect of an imperfect sea ...

2008

Impact of Materials and Design on Solid Oxide Fuel Cell Stack Operation

Stefan Diethelm, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Nordahl Autissier

Planar SOFC stack technology based on a unique concept (SOFConnex™) uses structured gas distribution layers between unprofiled metal sheet interconnects and thin Ni-YSZ anode supported electrolyte cells. The layers are flexible both in material and designa ...

2008

Design of 500 W Class SOFC Stack with Homogeneous Cell Performance

Stefan Diethelm, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Emily Thorn, Nordahl Autissier

Our planar SOFC stacking technology uses unprofiled metallic interconnects (MIC) and thin cells of tape cast anode supported YSZ. The key element is the gas diffusion layer (GDL) between cell and MIC, which consists of so-called SOFConnex™. Using square ce ...

The Electrochemical Society2007

Modeling and experimental validation of solid oxide fuel cell materials and stacks

Diego Larrain, Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Nordahl Autissier

Results on solid oxide fuel cell stacks tested at 800° C with H2 fuel and using planar Ni-zirconia anode supported cells, 80x80x0.2 mm in size, are presented. Modeling and numerical simulation is used to interpret observed results and develop improved desi ...

2005

Modeling and study of the influence of sealing on a solid oxide fuel cell

Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Minh-Tâm Luong, Nordahl Autissier

The properties of sealing materials are important for the performance and reliability of solid oxide fuel cells (SOFC). Even if the properties of a sealing material can be studied separately, it remains difficult to quantify the effect of an imperfect seal ...

2005

PROGRESS IN STACK POWER DENSITY USING THE SOFCONNEX™ CONCEPT

Alexandre Closset, Stefan Diethelm, Diego Larrain, Raphaël Ihringer, Jan Van Herle, Zacharie Wuillemin, Christian Blanc, Emily Thorn, Nordahl Autissier

Our SOFC stack development technology is based on the unique SOFConnexTM concept, using flexible gas distribution layers between metal sheet interconnect and thin ASE cells. Flexibility is given both in material and design. This ensures proper electrical c ...

The Electrochemical Society2005

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