Stefan Diethelm

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Publications associées (52)

Trade-off designs of power-to-methane systems via solid-oxide electrolyzer and the application to biogas upgrading

François Maréchal, Jan Van Herle, Stefan Diethelm, Guillaume Jeanmonod, Ligang Wang

Solid-oxide electrolyzer based power-to-methane is promising for large-scale energy storage as well as biogas upgrading by efficiently converting intermittent renewable power and CO2 (e.g., in biogas) into synthetic methane. Either air or pure oxygen can b ...

2019

Active Near-Infrared Imaging for Spatio-Temporal Monitoring of a Solid Oxide Cell in Operation

Jan Van Herle, Stefan Diethelm, Guillaume Jeanmonod

The characterization of solid oxide cells (SOCs) relies mainly on direct-current (DC) and alternating-current (AC) methods that provide only average surface electro-chemical responses. As such, the spatial distribution is not well captured and the complexi ...

2019

Design of a Pilot SOFC System for the Combined Production of Hydrogen and Electricity under Refueling Station Requirements

François Maréchal, Jan Van Herle, Stefan Diethelm, Alberto Mian, Maria del Mar Perez Fortes

The objective of the current work is to support the design of a pilot hydrogen and electricity producing plant that uses natural gas (or biomethane) as raw material, as a transition option towards a 100% renewable transportation system. The plant, with a s ...

2019

Model-assisted identification of solid oxide cell elementary processes by electrochemical impedance spectroscopy measurements

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

Electrochemical Impedance Spectroscopy (EIS) is extensively used to characterize Solid Oxide Cells (SOCs) to extract information on the elementary loss mechanisms. However, these individual mechanisms usually overlap in the frequency domain, requiring dedi ...

2019

Power-to-methane via co-electrolysis of H2O and CO2: The effects of pressurized operation and internal methanation

François Maréchal, Jan Van Herle, Stefan Diethelm, Ligang Wang, Tzu-En Lin, Hanfei Zhang

This paper presents a model-based investigation to handle the fundamental issues for the design of co-electrolysis based power-to-methane at the levels of both the stack and system: the role of CO2 in co-electrolysis, the benefits of employing pressurized ...

2019

Power-to-fuels via solid-oxide electrolyzer: Operating window and techno-economics

François Maréchal, Jan Van Herle, Stefan Diethelm, Ligang Wang, Tzu-En Lin

Power-to-fuel systems via solid-oxide electrolysis are promising for storing excess renewable electricity by efficient electrolysis of steam (or co-electrolysis of steam and CO2) into hydrogen (or syngas), which can be further converted into synthetic fuel ...

2019

Optimal design of solid-oxide electrolyzer based power-to-methane systems: A comprehensive comparison between steam electrolysis and co-electrolysis

François Maréchal, Jan Van Herle, Stefan Diethelm, Ligang Wang, Hossein Madi, Maria del Mar Perez Fortes

Power-to-methane technologies have been regarded as a promising alternative to offer small or large-scale, long-timescale (daily/weekly/seasonal) energy storage as well as the opportunity of utilizing CO2. The performance of the core component, the electro ...

2018

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

Jan Van Herle, Jürg Alexander Schiffmann, Stefan Diethelm, 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

Post-test Analysis on a Solid Oxide Cell Stack Operated for 10,700 Hours in Steam Electrolysis Mode

Jan Van Herle, Stefan Diethelm, Emad Oveisi, Pierre Burdet, Giorgio Rinaldi

A solid oxide short stack composed of 6 Ni-YSZ supported cells, YSZ electrolyte and GDC-LSC oxygen electrode has been tested for 10,700 hours in steam electrolysis. Initial degradation was followed by a global stabilization of the performance after lowerin ...

2017

Triode Solid Oxide Fuel Cell Operation Under Sulfur-Poisoning Conditions

Jan Van Herle, Stefan Diethelm, Priscilla Caliandro

The triode solid oxide fuel cell (SOFC) is a three electrodes configuration. The third electrode, so-called auxiliary, is connected in a way to run in electrolysis mode, while cathode and anode operate in normal fuel cell mode. This mixed operation allows ...

Wiley-V C H Verlag Gmbh2017

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Optimal design of solid-oxide electrolyzer based power-to-methane systems: A comprehensive comparison between steam electrolysis and co-electrolysis

François Maréchal, Jan Van Herle, Stefan Diethelm, Ligang Wang, Hossein Madi, Maria del Mar Perez Fortes

2018

Design of a Pilot SOFC System for the Combined Production of Hydrogen and Electricity under Refueling Station Requirements

François Maréchal, Jan Van Herle, Stefan Diethelm, Alberto Mian, Maria del Mar Perez Fortes

2019

Model-assisted identification of solid oxide cell elementary processes by electrochemical impedance spectroscopy measurements

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

2019