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Stefan Diethelm

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Publications associées (52)

Integrated System Design of a Small-scale Power-to-Methane Demonstrator

Stefan Diethelm, Jan Van Herle, François Maréchal, Alberto Mian, Ligang Wang

Power-to-methane technology has been considered as a promising alternative to cope with seasonal storage of renewable energy and the utilization of CO2 captured from various sources, due to the existing infrastructure for massive methane storage and distri ...

2017

Organic-sulfur poisoning of solid oxide fuel cell operated on bio-syngas

Stefan Diethelm, Jan Van Herle, Christian Ludwig, Hossein Madi

This study experimentally analyzes the performance and degradation issues of an anode supported (AS) Ni-YSZ solid oxide fuel cell exposed to thiophene (C4H4S). The impact of this organic sulfur compound on the performance of SOFC Ni-YSZ anodes is reported ...

Elsevier2016

Solid oxide fuel cell anode degradation by the effect of hydrogen chloride in stack and single cell environments

Stefan Diethelm, Jan Van Herle, Christian Ludwig, Hossein Madi, Davide Papurello

The poisoning effect by hydrogen chloride (HCl) on state-of-the-art Ni anode-supported solid oxide fuel cells (SOFCs) at 750 degrees C is evaluated in either hydrogen or syngas fuel. Experiments are performed on single cells and short stacks and HCl concen ...

2016

Investigation of 2R-Cell Degradation under Thermal Cycling and RedOx Cycling Conditions by Electrochemical Impedance Spectroscopy

Stefan Diethelm, Jan Van Herle, Vaibhav Singh

A 2R-cell with a 10 cm2 active area LSCF cathode on a CGO buffer layer was tested at 780°C under thermal and RedOx cycling conditions; 20 thermal cycles were performed between 780°C and 100°C, using 200°C/h heating ramps and natural cooling, followed by 20 ...

2015

Electrochemical Model of a Triode Solid Oxide Fuel Cell

Stefan Diethelm, Jan Van Herle, Arata Nakajo, Priscilla Caliandro

A Triode Solid Oxide Fuel Cell is a novel cell architecture that consists of two circuits: an auxiliary circuit, operated in electrolysis mode, and a conventional main fuel cell circuit. During triode operation, performance enhancement can be expected espe ...

2015

Damage of Siloxanes on Ni-YSZ Anode Supported SOFC Operated on Hydrogen and Bio-Syngas

Stefan Diethelm, Jan Van Herle, Christian Ludwig, Hossein Madi

This work presents the poisoning effect of organic oxo-silicon compounds (siloxanes) which are generally found in sewage biogas. Lifetime and durability associated with solid oxide fuel cell (SOFC) technology is strongly related to the amount of contaminan ...

Wiley-V C H Verlag Gmbh2015

The Impact of Toluene on the Performance of Anode-Supported Ni-YSZ SOFC Operated on Hydrogen and Biosyngas

Stefan Diethelm, Jan Van Herle, Christian Ludwig, Hossein Madi

This paper presents an experimental study of the impact of toluene on the performance of anode-supported (AS) Ni/YSZ SOFC operating at ∼800 °C, 0.25 A/cm2 fed with H2 and biosyngas. Toluene was added to the fuel stream and its concentration increased from ...

2015

Steam and Co-Electrolysis Sensitivity Analysis on Ni-YSZ Supported Cells

Stefan Diethelm, Jan Van Herle, Giorgio Rinaldi

The present paper investigates the variation in performances in steam electrolysis and co-electrolysis of steam/CO2 on SOEC single cells.In electrolysis mode, a sensitivity analysis was performed looking in particular at the effects of temperature (750°C a ...

2015

Solid oxide fuel cell anode degradation by the effect of siloxanes

Stefan Diethelm, Jan Van Herle, Hossein Madi, Davide Papurello

Lifetime and durability issues connected with Solid Oxide Fuel Cell (SOFC) technology are strongly related to the amount of contaminants that reach the stack. In this study the focus is on organic silicon compounds (siloxanes) and their highly detrimental ...

2015

Effect of Steam-to-Carbon Ratio on Degradation of Ni-YSZ Anode Supported Cells

Stefan Diethelm, Jan Van Herle, Hossein Madi

Internal steam reforming (IR) of methane was investigated on Ni- YSZ anode supported cells, looking in particular at the effect of the steam to carbon (S/C) ratio on the degradation rate. The cells were fed with different H2O/CH4 mixtures during 100 hours ...

2013

Electrolysis and Co-Electrolysis Performance of SOE Short Stacks

Stefan Diethelm, Jan Van Herle

In this study, two short SOE stacks (6-cells) were characterized in steam-electrolysis mode. The first was based on Ni-YSZ supported cells with LSCF-based air electrodes. The second included LSC-based air electrodes specifically developed within the SOFC60 ...

Wiley-V C H Verlag Gmbh2013

Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) feedstock development and optimization for thermoplastic forming of thin planar and tubular oxygen separation membranes

Stefan Diethelm

This paper presents the processing steps for producing thin planar and tubular oxygen separation membranes by thermoplastic forming of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) with polystyrene (PS) and stearic acid (SA) as binder. The influence of powder conten ...

Elsevier Science Bv2013

Investigating Reliability on Fuel Cell Model Identification. Part II: An Estimation Method for Stochastic Parameters

Stefan Diethelm, Daniel Favrat, Jan Van Herle, Arata Nakajo, Leonidas Tsikonis

An alternative way to process data from polarization measurements for fuel cell model validation is proposed. The method is based on re- and subsampling of IV data, with which repetitive estimations are obtained for the model parameters. This way statistic ...

Wiley-Blackwell2012

Electrochemical model of solid oxide fuel cell for simulation at the stack scale. Part II: Implementation of degradation processes

Stefan Diethelm, Daniel Favrat, Jan Van Herle, Arata Nakajo, Pietro Tanasini

The degradation of the electrochemical performance of solid oxide fuel cell (SOFC) devices is a major hurdle to overcome before commercialisation. The interplay between the phenomena and the long testing times complicate the research, which highlights the ...

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

Ethanol internal steam reforming in intermediate temperature solid oxide fuel cell

Stefan Diethelm, Jan Van Herle

This study investigates the performance of a standard Ni-YSZ anode supported cell under ethanol steam reforming operating conditions. Therefore, the fuel cell was directly operated with a steam/ethanol mixture (3 to 1 molar). Other gas mixtures were also u ...

Elsevier2011

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

A case study of the effect of grain size on the oxygen permeation flux of BSCF disk-shaped membrane fabricated by thermoplastic processing

Stefan Diethelm

Oxygen permeability measurements of Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF) disk shaped membranes fabricated by thermoplastic processing and sintered at different temperatures (1000–1100 °C), showed no influence of the grain size on the oxygen permeation fluxes. T ...

Elsevier2011

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

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

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