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Aïcha Hessler-Wyser

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Publications associées (100)

Reduction of nickel oxide particles by hydrogen studied in an environmental TEM

Aïcha Hessler-Wyser, Jan Van Herle, Quentin Thomas Jeangros, Cécile Hébert

In situ reduction of nickel oxide (NiO) particles is performed under 1.3 mbar of hydrogen gas (H-2) in an environmental transmission electron microscope (ETEM). Images, diffraction patterns and electron energy-loss spectra (EELS) are acquired to monitor th ...

Springer US2013

Time-Resolved X-Ray Microtomography Observation of Intermetallic Formation Between Solid Fe and Liquid Al

Aïcha Hessler-Wyser, Michel Rappaz, Guillaume Pasche, Cécile Hébert

Time-resolved in situ X-ray tomography combined with scanning electron microscopy was performed on an Al-Fe diffusion system at 973 K (700 A degrees C) to study the formation of the main intermetallic compounds occurring at the interface. After nucleation ...

Springer US2013

Three-dimensional chemical analysis of laser-welded NiTi–stainless steel wires using a dual-beam FIB

Aïcha Hessler-Wyser, Michel Rappaz, Marco Cantoni, Jonas Vannod, Pierre Burdet

The biomedical industry has an increasing demand for processes to join dissimilar metals, such as laser welding of NiTi and stainless steel wires. A region of the weld close to the NiTi interface, which previously was shown to be prone to cracking, was fur ...

Elsevier2013

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

Nickel oxide reduction studied by environmental TEM and in situ XRD

Aïcha Hessler-Wyser, Jan Van Herle, Quentin Thomas Jeangros, Cécile Hébert

2012

Three-dimensional microstructural changes in the Ni-YSZ solid oxide fuel cell anode during operation

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes

Microstructural evolution in solid oxide fuel cell (SOFC) cermet anodes has been investigated using X-ray nanotomography along with differential absorption imaging. SOFC anode supports composed of Ni and yttria-stabilized zirconia (YSZ) were subjected to e ...

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

A Review of RedOx Cycling of Solid Oxide Fuel Cells Anode

Aïcha Hessler-Wyser, Amédée Zryd, Jan Van Herle, Antonin Faes

Solid oxide fuel cells are able to convert fuels, including hydrocarbons, to electricity with an unbeatable efficiency even for small systems. One of the main limitations for long-term utilization is the reduction-oxidation cycling (RedOx cycles) of the ni ...

2012

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

UV-nanoimprint lithography and large area roll-to-roll texturization with hyperbranched polymer nanocomposites for light-trapping applications

Aïcha Hessler-Wyser, Yves Leterrier, Philippe Couty, Diego Fischer, Rémy Teuscher, Caroline Calderone, Marina Aymara González Lazo

Light-trapping textures were produced in hyperbranched polymer (HBP) silica nanocomposites using a UV-nanoimprint lithography (UVNIL) replication method, either in batch or roll-to-roll processes. The hardness of the HBP was found to increase by a factor o ...

Elsevier2012

On Potential Application of Coated Ferritic Stainless Steel Grades K41X and K44X in SOFC/HTE Interconnects

Aïcha Hessler-Wyser, Jan Van Herle

K41X is a ferritic stainless steel grade which was successfully developed in exhaust gas manifold where the temperature could reach 950°C. It contains about 18% wt of chromium and it is stabilized with both titanium and niobium to warranty a good weldabili ...

2011

X-ray Imaging and Analysis of 3D Microstructural Changes in Aged Ni-YSZ Anode

Aïcha Hessler-Wyser, Jan Van Herle, Antonin Faes

Ni-YSZ anode supports were used to fabricate test cells composed of yttria-stabilised zirconia (YSZ) electrolyte and lanthanum strontium ferrite (LSF) or lanthanum strontium manganite (LSM) / YSZ cathodes. These cells were operated at 720 °C at an average ...

2011

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

Large Area Roll-to-Roll Texturation with Hyperbranched Polymer Nanocomposites for Light-Trapping Applications

Aïcha Hessler-Wyser, Yves Leterrier, Rémy Teuscher, Marina Aymara González Lazo

2011

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

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

Design of experiment approach applied to reducing and oxidizing tolerance of anode supported solid oxide fuel cell. Part I: Microstructure optimization

Aïcha Hessler-Wyser, Jean-Marie Fuerbringer, Jan Van Herle, Antonin Faes, Driss Mohamedi

The main drawback of Ni/YSZ anode supports for solid oxide fuel cell application is their low tolerance to reducing and oxidizing (RedOx) atmosphere changes, owing to the Ni/NiO volume variation. This work describes a structured approach based on design of ...

Elsevier2011

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