M
Michel Lefèvre
Researcher at Institut national de la recherche scientifique
Publications - 41
Citations - 11534
Michel Lefèvre is an academic researcher from Institut national de la recherche scientifique. The author has contributed to research in topics: Catalysis & Proton exchange membrane fuel cell. The author has an hindex of 31, co-authored 41 publications receiving 10234 citations. Previous affiliations of Michel Lefèvre include General Motors.
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Journal ArticleDOI
Heat-treated Fe/N/C catalysts for O2 electroreduction: are active sites hosted in micropores?
TL;DR: It is reported that the activation process of carbon black and iron acetate heat-treated in NH(3) comprises three consecutive steps: incorporation of nitrogen atoms in the carbon, micropore formation through reaction between carbon and ammonia, and completion of active sites in the micropores by reaction of iron with ammonia.
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Molecular Oxygen Reduction in PEM Fuel Cells: Evidence for the Simultaneous Presence of Two Active Sites in Fe-Based Catalysts
TL;DR: In this paper, three catalysts for the electroreduction of oxygen have been prepared by pyrolyzing between 400 and 1000 °C two iron precursors (Fe acetate or Fe porphyrin) adsorbed on a synthetic carbon made from the pyrolys of PTCDA (perylene tetracarboxylic dianhydride) in a H2/NH3/Ar atmosphere.
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Correlations between mass activity and physicochemical properties of Fe/N/C catalysts for the ORR in PEM fuel cell via 57Fe Mössbauer spectroscopy and other techniques.
TL;DR: It was found that all catalysts contain the same FeN4-like species already found in INRS Standard, and all (Ar + NH3)-type catalysts have a much larger porosity than Ar- type catalysts, while the maximum number of their active sites is only slightly larger after a second heat treatment in NH3.
Journal ArticleDOI
Fe-based catalysts for the reduction of oxygen in polymer electrolyte membrane fuel cell conditions: determination of the amount of peroxide released during electroreduction and its influence on the stability of the catalysts
Michel Lefèvre,Jean-Pol Dodelet +1 more
TL;DR: In this paper, the authors used RRDE experiments to determine the values of the apparent number of electron transferred ( n ) and the percentage of peroxide (%H 2 O 2 ) released during the oxygen reduction reaction (ORR) in H 2 SO 4 at pH 1.9.
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O-2 reduction in PEM fuel cells: Activity and active site structural information for catalysts obtained by the pyrolysis at high temperature of Fe precursors
TL;DR: In this article, the authors studied the catalytic activity of perylene tetracarboxylic dianhydride (PTCDA) combined with Fe and N precursors for O-2 electroreduction in acidic medium.