Frédéric Fouda-onana

Atomic Energy and Alternative Energies Commission | CEA · Centre d'Etudes de Grenoble

This focuses on the decline in performance induced by the loss of wettability in the anode Porous transport layer (PTL) due to extended bubble coverage. We performed a series of multiple potentiometric tests including breaks every 10 hours combined with Electrochemical Impedance spectroscopy. Using this protocol, we obtain the variation in reaction...

Anion exchange membrane (AEM) electrolysis is the process for hydrogen generation with an Anion Exchange Membrane, using electricity. In this article, a 1D steady state model is introduced and elaborated to determine the performance of the AEM Electrolyser. In particular, the role of addition of Potassium Hydroxide and its overall impact on the Mul...

Cobalt molybdenum sulfide (Co0.5Mo0.5Sx) was evaluated, as an alternative cathode catalyst for hydrogen large scale production in an anion exchange membrane water electrolyzer (AEMWE). Performance testing in a Co0.5Mo0.5Sx//Ir single cell fed with 0.1 mol L–1 KOH exhibited the best activity reported to date for transition metal sulfide cathodes in...

Anion exchange membrane (AEM) electrolysis is the method of hydrogen generation with an Anion Exchange Membrane, using electricity. One of the major advantages of AEM water electrolysis is the replacement of conventional noble metal electrocatalysts with low-cost transition metal catalysts. This device have been modelled in the code MePHYSTO-WE dev...

This paper compares the performance over time of seven different operation modes with the scope of investigating realistic degradation responses of a polymer electrolyte membrane water electrolysis (PEM WE) to different operation modes for grid-balancing services. Among these modes are constant current and constant voltage operations at different t...

Polymer electrolytemembrane (PEM) degradation in electrolysismodeis simulated through a Fenton model that includes all major involved electrochemical reactions. Supportive experimental investigations on the effect of hydrogen peroxide and iron impurities are carried out in an ex-situ set-up, where the results are utilized to fit model parameters. T...

In this work, N-doped Multi-Walled Carbon Nanotubes (MWCNTs) and Few Graphene Layers (FGLs) have been functionalized with platinum nanoparticles using two methods starting with hexachloroplatinic acid as precursor: (i) ethylene glycol (EG) reduction and (ii) impregnation followed by reduction in hydrogen atmosphere. Morphological scanning transmiss...

In the MEGASTACK project, the existing PEM electrolyser stack designs of ITM power has been scaled up and combined with novel solutions to successfully achieve a MW-sized PEM stack design. Two-phase flow and structural mechanics modelling approach has been applied together with optimization of stack components such as MEAs, bipolar plates, current...

Proton Exchange Membrane Water Electrolysis (PEM WE) is considered as a key technology for large scale storage of renewable electricity, using hydrogen as an energy vector. To achieve economically viable MW-scale storage units, there is a strong trend to increase both current density and electrode surface area. Such upscaling raises concerns regard...

La présente invention concerne un procédé de préparation d'un catalyseur supporté comprenant au moins les étapes successives suivantes : a) traitement thermique d'un matériau carboné (C), à une température comprise entre 1400°C et 2300°C, le matériau carboné (C) étant choisi dans le groupe comprenant les nanotubes de carbone, le graphène, et les no...

Proton exchange membrane water electrolyzer (PEM WE) is an attractive electrochemical device that generates high purity hydrogen. However, its insufficient durability relatively to its high system cost is a bottleneck of that technology when compared to alkaline water electrolysis. In this work, the influence of the ageing protocols on PEM WE perfo...

INTRODUCTION The development of energy storage and conversion technologies has intensified in recent years. Today, Polymer Electrolyte Membrane Fuel Cells (PEMFCs) has been recognized as one of the most important and environmentally friendly technologies. The catalytic layers of PEMFC, usually composed of Pt/carbon, gas voids and ionomer, are key e...

A 1D polymer electrolyte membrane water electrolyzer (PEMWE) model that incorporates chemical degradation of the membrane is developed to study the influence of temperature and current density on the membrane degradation. The development of the model is supported by specific single cell experiments to both validate the different modeling assumption...

In this work, a 1D polymer electrolyte membrane water electrolyzer (PEMWE) model that incorporates chemical degradation of the membrane is developed to study the influence of temperature and current density on the membrane degradation. In the 1D performance model, electronic and ionic transports through the different cell components are considered...

Low platinum loading electrode was successfully deposited by a modified pulse galvanic signal in H2PtCl6 electrolyte using carbon black as support directly on a GDL (Gas Diffusion Layer). SEM images of the deposition were composed by rough Pt particles of 50 nm leading to specific electrochemical surface area of 53 m2 g−1. In spite of large particl...

The invention relates to a method for making an electronic and catalytic conductive electrode containing metal particles, including: a step of electrodepositing a metal salt for forming said metal particles at the surface of an electrode, characterized in that the step of electrodepositing the metal salt is carried out in the presence of a blocking...

IrO 2, Ir xSn (1-x)O 2 (x = 0.7, 0.5) and Ir xRu (1-x)O 2 (x = 0.7, 0.5) electrocatalysts for the oxygen evolution reaction (OER) have been synthesized using the Adams fusion method. The metal oxides were characterized via X-ray diffraction, scanning electron microscopy, inductively coupled plasma-atomic emission spectrometry and nitrogen adsorptio...

The oxygen reduction reaction (ORR) on Pd–Cu catalyst has been studied in acidic media. The palladium alloys were prepared by coating glassy (GC) carbon substrates using a R-F magnetron sputtering equipment with a palladium and a copper wafer as targets. The dual sputtering we used has allowed us to obtain a thin film of 1 μm thick. The ORR kinetic...

The invention relates to a method for depositing a metal M1 onto a carbon layer, as well as to a method for manufacturing an electrode for fuel cells and to a method for manufacturing a fuel cell. The method for depositing a metal M1 onto a porous carbon layer according to the invention includes a step of depositing said metal M1 by means of the el...

Variation of the intrinsic metal surface properties (lattice parameter, binding energy, work function (Wf), d-band filling and d-band center ɛd) and O2 and OH adsorption energies of on (1 1 1) Pd–Cu surface alloys were determined using ab initio program. Calculations of these parameters were based on plane waves approach on slab system with density...

This thesis is on the development of the ORR on Pd-Cu alloys in acid medium. Density Functional Theory (DFT) was used to determine the intrinsic properties of the alloys. The alloys were fabricated by RF sputtering on glassy carbon support and chemical salt reduction on carbon support. They characterised by electrochemical methods and correlations...

Mémoire (M.Sc.) - Université du Québec à Trois-Rivières, 2004. Comprend des réf. bibliogr.: f. 73-75.