Publications by Jan Van Herle | EPFL Graph Search

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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 ...

As environmental concerns intensify and energy demand rises, the global quest for sustainable energy sources becomes crucial. Given the intermittent nature of renewable electricity, the quest for transient solutions becomes imperative to ensure energy security. Solid oxide fuel cell (SOFC) stands out as a promising technology, characterized by its high electrical efficiency, fuel flexibility, and the capability for co-producing heat. Integrating SOFC into an energy system necessitates a dynamic model capabl

The increasing demand for renewable energy integration and scalable power generation highlights the need for efficient and cost-effective solid oxide fuel cell systems. In this study, we present a modular hybrid design framework that enables flexible solid oxide fuel cell scale-up by interconnecting standardized component modules. We introduce a series-parallel configuration that strategically leverages anode and cathode off-gas recirculation to enhance both electrical and thermal efficiency. Through a deta

In order to characterize a new SOFC stack design, to investigate degradation processes and to validate models, a diagnostic test station was designed and realized. It allows to characterize repeat-elements locally by measuring the local potential, current density and temperature over the active area. The active area is segmented in 18 small electrically insulated measurement points (segments), in addition to a main segment. The profile of current density was investigated up to an average of 0.6A/cm2 and 67%

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. Symmetrical cells with Nd1.95NiO4+δ (NNO) electrodes on gadolinia-doped ceria electrolyte supports were monitored over time-spans of 1000 h under polarisation in an air-flux with deliberate chromium contamination. Impedance spectroscopy pointed out a polarization increase with time by the growth of the low frequency arc describing the el

Electrical energy storage systems are indispensable for the electrical grid with high penetration renewables. Reversible solid-oxide cell stack based power-to-x-to-power systems, which can switch between power generation and power storage, can achieve a hi ...

We present a SOFC stack technology based on the unique SOFConnex™ concept. It uses flexible gas distribution layers between metal sheet interconnects and thin ASE cells (Ni-YSZ anode supported, thin electrolyte). Flexibility is given both in material and d ...

A combined thermal and simple kinetic model is applied to a small single solid oxide fuel cell (SOFC, 20 cm2 square cell of anode supported electrolyte with 1 cm2 active area). The aim was to compute the temperature field to analyze the operating conditions of the active area of the cell. The cell is simulated in the conditions used for electrochemical characterization, i.e. at negligible fuel utilization and thermally non-adiabatic. Though using a very simple kinetic model, the simulated polarization curve

The effect of the bulk microstructure (grain size distribution, grain boundary composition on the oxygen transport properties of La0.5Sr0.5FeO3membranes was investigated. For this purpose, samples with different microstruct ...

Solid oxide fuel cell (SOFC) technology is of great potential for efficient combined heat and power (CHP) generation with low overall emissions. To ensure safe and efficient operations of μ-CHP SOFC systems, appropriate control and optimization methods are required. This is generally achieved by using model-based optimization techniques, whereby operating conditions that maximize efficiency and ensure constraint satisfaction are sought. However, mismatch or disturbances always exist between a 'plant' (actua

(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 ...

A small cogeneration system based on a Solid Oxide Fuel Cell (SOFC) fed on the renewable energy source biogas is presented. An existing farm biogas production site (35 m3 per day), currently equipped with a SOFC demonstration stack, is taken for reference. A process flow diagram was defined in a software package allowing to vary system operating parameters like the fuel inlet composition, reforming technology, stack temperature and stack current (or fuel conversion). For system reforming simplicity, a base

The power-to-methane process using a solid-oxide electrolyser, followed by an exothermic methanation reactor, is effective for the production of an energy carrier (synthesis methane) that can be readily stored and transported at a large scale. A significan ...

Among renewable energy sources biomass plays a major role. Several paths for improving the conversion of biomass with minimum burden on the environment are being pursued worldwide. This paper reviews some of the most recent results from research at the Swiss Federal Institute of Technology of Lausanne. On the theoretical and experimental sides it covers the improvement of biogas combustion engines using combustion prechambers both with spark ignition or autoignition in order to reduce the emissions while ke

The current advances in the integration of devices through the internet of things (IoT) have encouraged researchers to focus on the applications of IoT in the automotive industry. Although different achievements in the in-vehicle network analysis and traff ...

A solid oxide fuel (SOFC) cogenerates heat and electricity with high efficiency. Electricity is produced by the electrochemical reaction of a fuel (H2, CO, CH4) and an oxidant gas (O2, air). The SOFC standard design is based on an anode-supported electrolyte. The anode is composed of yttria-stabilized zirconia (YSZ) and nickel oxide (NiO). NiO is reduced in situ into metallic nickel during the first use of the fuel cell. Porosity is formed to compensate the volume shrinkage induced by the reduction (40 vol%

The project addresses the problem of chemical and mechanical stability of dense ceramic oxygen separation membrane for the partial oxidation (POX) of methane to synthesis gas. In operating conditions, the membranes are exposed to strong thermal and composition gradients which result in local stresses and possible fracture. A series of candidate materials were synthesised and characterised. Samples were prepared in the form of pellets, rods and tubes for the measurement of their properties (thermal and chemi

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 ...

The effect of the bulk microstructure (grain size distribution, grain boundary length) on the oxygen transport properties of permeation membranes is investigated in this work. For this purpose, La0.5Sr0.5FeO3-? samples with different microstructures have been prepared by modifying the sintering duration and/or temperature. The average grain sizes, ranging from 0.20 to 1.43 micron, were determined from SEM analysis. The oxygen transport properties of these samples were characterised by permeation measurement

Solid oxide fuel cell (SOFC) systems can last over five years, making data collection for lifespan predictions time-consuming. Accelerating their degradation is thus essential to advance the development of next fuel cell generations. Accelerated life testing (ALT) reduces the time-to-failure by operating systems outside normal conditions, but it requires a comprehensive understanding of the degradation mechanisms to select proper stressors. Finding critical stressors and understanding their impact on cell a

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Electrolysis and Co-Electrolysis Performance of SOE Short Stacks

Refining SOFC Performance: Parameter Estimation and Model Validation for Dynamic Energy System Optimization

Scalable modular design of solid oxide fuel cell systems for enhanced large-scale power generation

Investigation of Local Electrochemical Performance and Local Degradation in an Operating Solid Oxide Fuel Cell

Nd-Nickelate Solid Oxide Fuel Cell Cathode Sensitivity to Cr and Si Contamination

Reversible solid-oxide cell stack based power-to-x-to-power systems: Economic potential evaluated via plant capital-cost target

Innovative flexible SOFC stack concept

Thermal modeling of a small anode supported solid oxide fuel cell

Correlation between oxygen transport properties and microstructure in La0.5Sr0.5FeO3-δ

Modeling and real-time optimization of a μ-CHP SOFC system

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

Energy balance model of a SOFC cogenerator operated with biogas

Evaporating water-cooled methanation reactor for solid-oxide stack-based power-to-methane systems: Design, experiment and modeling

Selected pathways for a more efficient conversion of biomass in cogeneration or fuel production

The applications of Internet of Things in the automotive industry: A review of the batteries, fuel cells, and engines

Solid oxide fuel cell redox instability characterized by in situ transmission electron microscopy

Numerical modelling and experimental analysis of a tubular dense ceramic oxygen separation membrane, for the application of partial oxidation of natural gas to synthesis gas

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

Influence of microstructure on oxygen transport in perovskite type membranes

Accelerated Life Test Protocol Development for Solid Oxide Fuel Cells Using a Design of Experiment Methodology