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Jan Van Herle

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Related publications (225)

Air Side Contamination in SOFC 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 ...

2010

The error in gas temperature measurements with thermocouples. Application on an SOFC system Heat Exchanger

Jan Van Herle, Leonidas Tsikonis

We develop a mathematical model and simulate the measurement of gas temperatures as applied by insertion of a thermocouple into a gas stream in order to integrate this model in a model that simulates the Heat Exchanger of an SOFC system. The model is valid ...

2010

Fabrication and Characterisation of Cathode Support-tubes for Micro-tubular SOFC Application

Stefan Diethelm, Paul Bowen, Heinrich Hofmann, Jan Van Herle, John Espen Rossen

Tubes of diameter

2009

In situ reduction and oxidation of nickel from solid oxide fuel cells in a Titan ETEM

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes, Quentin Thomas Jeangros

Solid Oxide Fuel Cells (SOFC) common technology is based on anode- supported cells composed of nickel-yttria stabilized zirconia (Ni-YSZ) cermet. The nickel is in oxide state (NiO) during SOFC production and is reduced to metallic nickel during the first o ...

2009

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

Nickel-Zirconia Anode Degradation and Triple Phase Boundary Quantification from Microstructural Analysis

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes

Microstructural evolution of anode supported solid oxide fuel cells (SOFC) during medium-term stack testing has been characterized by scanning electron microscopy (SEM). Low acceleration voltage SEM imaging is used to separate the three anode phases (nicke ...

2009

Experimental and Theoretical Investigation of Degradation Mechanisms in SOFC Electrodes

Aïcha Hessler-Wyser, Christos Comninellis, Jan Van Herle, Antonin Faes, Pietro Tanasini

Performance degradation data obtained on single solid oxide fuel cells tested at 850°C with air and humidified H2 and using Ni-YSZ anode supported cells are presented. Microscopic investigation is carried out on both anode and cathode to quantify variation ...

2009

Sulfur as pollutant species on the cathode side of a SOFC system

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

Sulfur poisoning in a strontium doped lanthanum cobaltite (LSC) cathode current collection layer was revealed in a solid oxide fuel cell (SOFC) tested in repeat-element and stack configuration. Sources of sulfur contamination, other than trace SOx in air, ...

2009

RedOx study of anode supported solid oxide fuel cell

Aïcha Hessler-Wyser, Jan Van Herle, Arata Nakajo, Antonin Faes, David Dubois

The common technology for solid oxide fuel cells (SOFC) is based on a cermet (ceramic-metal composite) anode of nickel with yttria stabilized zirconia (YSZ), often used as the supporting structure. One of the main limitations of this technology is the tole ...

2009

Improved stability of La0.5Sr0.5FeO3 by Ta-doping for oxygen separation membrane application

Stefan Diethelm, Jan Van Herle, Defne Bayraktar

(La,Sr)FeO3 mixed conducting perovskites are considered as interesting candidates for oxygen separation membranes but they suffer from limited structural stability in a large oxygen partial pressure (pO2) gradient, because of their propensity for chemical ...

2009

In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes, Quentin Thomas Jeangros

Environmental transmission electron microscopy was used to characterize in situ the reduction and oxidation of nickel from a Ni/YSZ solid oxide fuel cell anode support between 300-500°C. The reduction is done under low hydrogen pressure. The reduction init ...

2009

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

Cathode-supported micro-tubular SOFCs based on Nd1.95NiO4 + δ: Fabrication and characterisation of dip-coated electrolyte layers

Paul Bowen, Heinrich Hofmann, Jan Van Herle, Ulrich Aschauer, Josef Andreas Schuler, Henning Lübbe

Fabrication conditions to obtain dense electrolyte double layers on a porous micro-tubular cathode substrate were investigated. Porous tubes of a nickelate material, Nd1.95NiO4 + δ, were fabricated by cold-isostatic pressing (CIP) and sintering. Thin ﬁlms ...

2009

Redox study of anode supported solid oxide fuel cell

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes

The common technology for solid oxide fuel cells (SOFC) is based on a cermet anode of nickel with yttrium stabilized zirconia (YSZ), often used as the supporting structure. One of the main limitations of this anode technology is the redox tolerance. In thi ...

2008

Quantitative study of anode microstructure related to SOFC stack degradation

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes

As the performances of Solid Oxide Fuel Cells (SOFC) get attractive, long term degradation becomes the main issue for this technology. Therefore it is essential to localise the origin of degradation and to understand its processes in order to find solution ...

Springer-Verlag2008

Ageing of anode-supported solid oxide fuel cell stacks including thermal cycling, and expansion behaviour of MgO-NiO anodes

Stefan Diethelm, Jan Van Herle

This paper reports on medium term tests of anode-supported five-cell short stacks, as well as on some separate anode development. Two stacks were operated under steady-state conditions: one with unprotected metal interconnects, H-2 fuel and 0.35 A cm(-2) ( ...

Elsevier2008

Rapid preparation and SEM microstructural characterization of nickel-yttria- stabilized zirconia cermets

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes, Christian Monachon

Sample preparation and scanning electron microscopy imaging methods were developed to characterize solid-oxide fuel cell anodes made out of a nickel- yttria-stabilized zirconia porous cermet. The sample preparation uses only tripod polishing and does not r ...

2008

Ageing of anode-supported solid oxide fuel cell stacks including thermal cycling, and expansion behaviour of MgO–NiO anodes

Stefan Diethelm, Jan Van Herle

2008

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

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