A5033832028- Fuel Cells and Related Materials
- Electrocatalysts for Energy Conversion
- Conducting polymers and applications
- Advanced Battery Technologies Research
- Electrochemical Analysis and Applications
- Soil and Unsaturated Flow
- Advanced battery technologies research
- Supercapacitor Materials and Fabrication
- Advancements in Solid Oxide Fuel Cells
- Analytical Chemistry and Sensors
- Membrane-based Ion Separation Techniques
- Grouting, Rheology, and Soil Mechanics
- Rock Mechanics and Modeling
- Advanced Memory and Neural Computing
- Landslides and related hazards
- Dam Engineering and Safety
- Advanced Surface Polishing Techniques
- Geotechnical Engineering and Soil Mechanics
- Fault Detection and Control Systems
- Nuclear and radioactivity studies
- Mechanical and Optical Resonators
- MXene and MAX Phase Materials
- Nuclear Materials and Properties
- Fiber-reinforced polymer composites
- Acoustic Wave Resonator Technologies
Laboratoire Énergies et Mécanique Théorique et Appliquée
2016-2025
Université de Lorraine
2016-2025
Centre National de la Recherche Scientifique
2012-2024
Laboratório Nacional de Computação Científica
2012-2016
Saarland University
2005
MEAs with various cathode Pt loadings were elaborated and aged using a multiple-stressor accelerated stress test (AST) in segmented PEMFC.
Electrochemical Impedance Spectroscopy (EIS) is a well-established technique for studying Polymer Exchange Membrane Fuel Cells (PEMFC) but data interpretation remains delicate, mostly because impedance models are either based on oversimplified equations or conversely, include too many correlated parameters. It thus crucial to carefully choose the interpret data, according FC materials and operation conditions. Most of PEMFC spectra composed two loops in Nyquist plot that can be perfectly...
The usual expression of the finite Warburg element used for analyzing electrochemical impedance spectroscopy spectra is obtained assuming that reaction occurs at electrode/membrane interface and oxygen concentration gas channel/gas diffusion layer constant. A simple improvement this consists in depletion along channel. This pseudo-two-dimensional approach should be more appropriate investigation mass transfer limitations membrane–electrode assemblies polymer electrolyte membrane fuel cells...
Abstract A one‐dimensional (1D) model of oxygen transport in the diffusion media proton exchange membrane fuel cells (PEMFC) is presented, which considers convection perpendicular to electrode addition diffusion. The resulting analytical expression convecto‐diffusive impedance obtained using a convection–diffusion equation instead case classical Warburg impedance. main hypothesis that convective flux generated by evacuation water produced at cathode flows through porous vapor phase. This...
A three‐scale model is proposed to describe electro‐chemo‐mechanical couplings in unsaturated swelling clays characterized by two porosity levels and three separate length scales. The nanoscale portrait consists of charged clay particles separated a nanoporous network saturated binary monovalent aqueous electrolyte solution. Local ion distribution electric potential are governed the Poisson–Boltzmann problem. At microscale, system represented swollen clusters from each other micropores...
High performance Brillouin microscopy (BM) has been used to characterize the spatial distribution of piezoelectrically induced acoustic fields excited at microwave frequencies in a LiNbO3 single crystal. It is demonstrated that under suitable conditions BM able detect microwave-induced bulk as well surface waves. spectroscopy probe sound wave intensities phonons, which are small those thermal phonons.
Abstract The interplay between i) cathodic electrocatalytic layer (EC layer) features of proton exchange membrane fuel cell (PEMFC), focusing on the oxygen reduction reaction (ORR) electrocatalyst (EC) and Pt loading; ii) PEMFC performance durability is evaluated. An innovative hierarchical “core–shell” carbon nitride multimetallic ORR ( “PtCuNi/C” H‐EC) compared with a conventional Pt/C benchmark. various contributions to at beginning test (BOT) are isolated correlated physicochemical EC...
Abstract The high power density of polymer exchange membrane fuel cells (PEMFCs) and hydrogen storage may be significantly hampered by the size weight ancillaries needed to control air flow rates humidity. In order overcome these difficulties, a variety research has been carried out on development hybrid systems based supercapacitors or batteries, which raises questions about best architectures strategies may, if not well mastered, enhance complexity entire system. this study, we focus...
Our recently developed multi-scale form of Terzaghi's effective stress principle for unsaturated swelling clays that was rigorously derived by periodic homogenization starting from micro- and nano-mechanical analyses is applied to numerically simulate one-dimensional pressure tests compacted bentonites during hydration. The total macroscopic captures the coupling between disjoining forces at nanoscopic scale clay platelets capillary effects microscopic aggregates over entire water content...
A novel form of Terzaghi's effective stress principle is proposed to describe electro-chemo-mechanical couplings in unsaturated swelling clays characterized by two porosity levels (nanopores saturated an aqueous electrolyte solution and micropores partially with water air). Under mechanical equilibrium, the three-scale model derived using homogenization procedure. Macroscopic constitutive laws are within framework work-conjugated stress-strain variables leading a set three pairs state...