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Josef Andreas Schuler

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Publications associées (58)

Chromium Poisoning : The Needle in the SOFC Stack

Josef Andreas Schuler

This thesis focuses on Cr-poisoning in solid oxide fuel cells (SOFC), which currently presents a key challenge for the development of this technology. By the implementation of dedicated experimental tools, this work offers a new access to, and comprehensio ...

EPFL2012

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

Nd-nickelate solid oxide fuel cell cathode sensitivity to Cr and Si contamination

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

The stability of Nd-nickelate, considered as an alternative solid oxide fuel cell (SOFC) cathode material, was evaluated in this work on its tolerance towards contaminants. ...

Elsevier2012

Mitigating Cr Contamination by Hot Air Filtering in Solid Oxide Fuel Cells

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

Cr contamination, generated by system components located upstream a solid oxide fuel cell (SOFC) and responsible for Cr-poisoning induced air electrode performance degradation, must be suppressed by hindering the access of Cr pollutants to the cathode comp ...

Electrochemical Society2011

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

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

Cathode thickness-dependent tolerance to Cr-poisoning in solid oxide fuel cells

Aïcha Hessler-Wyser, Christos Comninellis, Jan Van Herle, Josef Andreas Schuler, Pietro Tanasini

This work aimed to set new guidelines for the quantification of Cr accumulation in solid oxide fuel cell cathodes after operation, and enabled to pinpoint a diffusion-controlled tolerance to Cr-poisoning for increased cathode thickness; the additional cath ...

Elsevier2010

Rapid chromium quantification in solid oxide fuel cell cathodes

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

The detection and quantification of small quantities of Cr in (La,Sr)MnO3/Y–ZrO2 solid oxide fuel cell (SOFC) cathodes by energy-dispersive X-ray spectroscopy (EDXS) is not straightforward as Cr X-ray emission lines overlap with La/Mn and O lines. This wor ...

Elsevier2010

Air Side Contamination in SOFC Stack Testing

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

2010

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

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

Nanostructured Coatings on Glazing for Active Solar Facades

Christian Roecker, Jean-Louis Scartezzini, Estelle De Chambrier, Josef Andreas Schuler, Maria Cristina Munari Probst, Dipanwita Dutta

Thin films on glazing play an important role in the design of solar energy conversion systems as thermal collectors or photovoltaic panels. Antireflective coatings based on porous silicon dioxide are well established in the field of solar collector glazing ...

EPFL2007

Sol-gel deposition and characterization of low refractive index nanocomposite Mg:F:Si:O thin films for solar and protective coatings

Christian Roecker, Jean-Louis Scartezzini, Estelle De Chambrier, Josef Andreas Schuler, Dipanwita Dutta

Coatings for thermal solar energy conversion have to be abrasion-resistant, stable at elevated temperatures, and often have to protect the substrate against corrosion. Due to the conditions of refractive index matching between the substrate and the ambient ...

2007

Optical properties of metal-doped carbon based nanocomposite thin films: Comparing experiment to effective medium theories

Josef Andreas Schuler

Nanocomposite thin films exhibit interesting optical properties which differ from those of the pure constituents. Effective medium theories are used to model the dielectric function of the nanocomposite materials. We give an introduction to the theories of ...

2006

Quantum dots in photovoltaic solar energy conversion

Josef Andreas Schuler

Quantum dots have attracted recently considerable attention of the research communities in solid state and biophysics. Due to their fascinating optical and electronical properties, nanometer-scaled structures play an important role in solar energy conversi ...

2006

Sol-gel deposition of nanostructured low refractive index materials on solar collector glazing

Christian Roecker, Jean-Louis Scartezzini, Estelle De Chambrier, Josef Andreas Schuler, Dipanwita Dutta

Nanoporous SiO2 and nanocomposite MgF2:SiO2 coatings have been deposited by sol gel dip-coating in a particle-free atmosphere. The refractive index of the prepared nanostructured thin films is determined from spectrophotometric data. In both cases, signifi ...

2006

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