Publications de Zacharie Wuillemin

Local electrochemical and thermal investigation of a segmented reversible solid oxide fuel cell and electrolyzer

Stefan Diethelm, Jan Van Herle, Zacharie Wuillemin, Audrey Désirée Wesoly, Hamza Moussaoui

A novel setup has been designed and mounted to investigate the local electrochemical and thermal behavior of a cell from a 4-cell short stack under reversible operation solid oxide fuel cell/solid oxide electrolyzer (SOFC/SOE). It consists in the partition ...

Pergamon-Elsevier Science Ltd2023

Experimental characterization of a solid oxide fuel cell coupled to a steam-driven micro anode off-gas recirculation fan

Stefan Diethelm, Jürg Alexander Schiffmann, Jan Van Herle, Zacharie Wuillemin, Patrick Hubert Wagner, David Constantin

While the global fuel utilization of solid oxide fuel cells (SOFCs) is limited by the stack aging rate, the fuel excess is typically used in a burner, and thus limiting the system electrical efficiency. Further, natural-gas-fueled SOFCs require treated wat ...

2020

Sofc system with anode off-gas recirculation

Jürg Alexander Schiffmann, Daniel Favrat, Jan Van Herle, Zacharie Wuillemin, Patrick Hubert Wagner

The present invention concerns an SOFC system comprising an anode off-gas recirculation arrangement in which anode off-gas is pumped by a fan or pump of a coaxial turbine-fan assembly, the system comprising a condenser for condensing water contained in sai ...

2020

Enforcing optimal operation in solid-oxide fuel-cell systems

Dominique Bonvin, Christophe Salzmann, Jan Van Herle, Zacharie Wuillemin, Timm Faulwasser, Tafarel de Avila Ferreira

This paper describes an optimization strategy for operating solid-oxide fuel-cell systems at optimal efficiency. Specifically, we present the experimental validation of a real-time optimization (RTO) strategy applied to a commercial solid-oxide fuel-cell s ...

2019

Real-time optimization of an experimental solid-oxide fuel-cell system

Dominique Bonvin, Christophe Salzmann, Jan Van Herle, Zacharie Wuillemin, Alejandro Gabriel Marchetti

There still exists a large gap between simulation work and industrial applications in the context of control and optimization of solid-oxide fuel-cell (SOFC) systems. In an effort to bridge this gap, this study describes the experimental implementation of ...

ELSEVIER SCIENCE BV2019

Fast RTO Applied to a Commercial SOFC System

Dominique Bonvin, Zacharie Wuillemin, Alejandro Gabriel Marchetti

The experimental implementation of real-time optimization (RTO) to a commercial solid-oxide fuel-cell (SOFC) system is reported in this paper. The goal of RTO is to maximize the system efficiency at steady state subject to several operating constraints. Th ...

ELSEVIER SCIENCE BV2019

Production and Reliability Oriented SOFC Cell and Stack Design

Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Fabio Greco, Xin Wang

This paper presents an innovative development methodology for a production and reliability oriented SOFC cell and stack design aiming at improving the stacks robustness, manufacturability, efficiency and cost. Multi-physics models allowed a probabilistic a ...

2017

The Effects of Component Tolerances on the Thermo-Mechanical Reliability of SOFC Stacks

Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Fabio Greco

The reliability of solid oxide fuel cell (SOFC) systems is closing the gap to meet the requirements for market implementation. Finite-element (FE) stack models, typically used for stack reliability analyses, commonly consider idealized components. In reali ...

2017

Modeling and Designing of a Radial Anode Off-Gas Recirculation Fan for Solid Oxide Fuel Cell Systems

Stefan Diethelm, Jürg Alexander Schiffmann, Jan Van Herle, Zacharie Wuillemin, Patrick Hubert Wagner

To improve the industry benchmark of solid oxide fuel cell (SOFC) systems, we consider anode off-gas recirculation (AOR) using a small-scale fan. Evolutionary algorithms compare different system design alternatives with hot or cold recirculation. The syste ...

2017

Thermo-mechanical Reliability of SOFC Stacks During Combined Long-term Operation and Thermal Cycling

Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Fabio Greco

Thermo-mechanical issues in solid oxide fuel cells (SOFC) must be understood and overcome to meet the reliability standards for market implementation. This study presents a thermo-mechanical model of an SOFC-stack SRU. The analysis starts with the simulati ...

2015

Fabrication of structured anode-supported solid oxide fuel cell by powder injection molding

Amédée Zryd, Jan Van Herle, Zacharie Wuillemin, Antonin Faes

Powder Injection Molding (PIM) gives the possibility to produce, at an industrial rate, ceramic parts with fine details. It is thus a possible approach to reduce the fabrication costs of Solid Oxide Fuel Cells (SOFCs). This work presents fabrication and el ...

2013

Local Activation and Degradation of Electrochemical Processes in a SOFC

Jan Van Herle, Zacharie Wuillemin, Yannik Antonetti, Hossein Madi

The local electrochemistry is studied in a SOFC repeat-element using a test setup that allows a local control of the polarization. During long-term tests, the local current densities evolve, following activation and degradation periods. Electrochemical imp ...

2013

Cr-poisoning in (La,Sr)(Co,Fe)O-3 cathodes after 10,000 h SOFC stack testing

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

After 10,000 h solid oxide fuel cell (SOFC) stack operation, the Cr-poisoning situation in (La0.6Sr0.4) (Co0.2Fe0.8)O-3 (LSCF)-based cathode material is depicted in this work. Systematic Cr profiling by energy-dispersive X-ray spectroscopy (EDS), from post ...

Elsevier2012

Spotting Solid Oxide Fuel Cell Degradation Effects by Electron Microscopy

Aïcha Hessler-Wyser, Jan Van Herle, Zacharie Wuillemin

2012

Combined Cr and S poisoning in solid oxide fuel cell cathodes

Aïcha Hessler-Wyser, Jan Van Herle, Zacharie Wuillemin, Josef Andreas Schuler, Quentin Thomas Jeangros, Caroline Calderone

This work aims to compare the effect of combined chromium and sulfur contaminating conditions to the Cr contamination alone on the Cr poisoning mechanisms in (La,Sr)MnO3-(Zr,Y)O-2 solid oxide fuel cell (SOFC) cathodes. Whereas Cr2O3 and (Cr,Mn)(3)O-4 are f ...

Elsevier2012

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 ...

2012

Robust Real-Time Optimization of a Solid Oxide Fuel Cell Stack

Dominique Bonvin, Jan Van Herle, Zacharie Wuillemin, Arata Nakajo, Alejandro Gabriel Marchetti, Benoît Chachuat, Leonidas Tsikonis

On-line control and optimization can improve the eﬃciency of fuel cell systems whilst simultaneously ensuring that the operation remains within a safe region. Also, fuel cells are subject to frequent variations in their power demand. This paper investigate ...

2011

Segmented cell testing for cathode parameter investigation

Christos Comninellis, Jan Van Herle, Zacharie Wuillemin, Josef Andreas Schuler, Pietro Tanasini

The increasing quality and durability of solid oxide fuel cells (SOFCs) state-of-the-art materials renders the long-term testing of fuel cells difficult since considerably long equipment times are needed to obtain valuable results. Moreover, reproducibilit ...

Elsevier2011

Design of experiment approach applied to reducing and oxidizing tolerance of anode supported solid oxide fuel cell. Part II: Electrical, electrochemical and microstructural characterization of tape-cast cells

Stefan Diethelm, Aïcha Hessler-Wyser, Jan Van Herle, Zacharie Wuillemin, Marco Cantoni, Antonin Faes, Pietro Tanasini, Henning Lübbe, Nicola Accardo

One of the major limitations of the nickel (Ni) - yttria-stabilized zirconia (YSZ) anode support for solid oxide fuel cells (SOFC) is its low capability to withstand transients between reducing and oxidizing atmospheres ("RedOx" cycle), owing to the Ni-to- ...

Elsevier2011

Redox stable Ni–YSZ anode support in solid oxide fuel cell stack configuration

Jan Van Herle, Zacharie Wuillemin, Antonin Faes, Pietro Tanasini, Nicola Accardo

State-of-the-art nickel-based SOFC anode-supported cells are highly sensitive to reoxidation of the metal phase at the temperature of utilization. This work presents results on redox stable nickel–YSZ (yttria- stabilized zirconia) anode-supported cells, fo ...

Elsevier2011