Frédéric Maillard
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View article: Implementing MOF-derived Nickel Catalysts as Anion Exchange Membrane Fuel Cell Anode
Implementing MOF-derived Nickel Catalysts as Anion Exchange Membrane Fuel Cell Anode Open
Due to their acidic environment, the present generation of proton-exchange membrane fuel cells (PEMFC) requires precious metal catalysts, in particular platinum, which is an obstacle to their large-scale deployment. In contrast, anion-exch…
View article: Kinetics of Hydrogen Absorption in Individual α-Phase Palladium Nanoparticles
Kinetics of Hydrogen Absorption in Individual α-Phase Palladium Nanoparticles Open
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View article: Evaluation of carbon-capped PtNi nanoparticles supported on graphitized carbon black – from rotating disk electrode to unit proton exchange membrane fuel cell operated at 95 °C
Evaluation of carbon-capped PtNi nanoparticles supported on graphitized carbon black – from rotating disk electrode to unit proton exchange membrane fuel cell operated at 95 °C Open
International audience
View article: (<i>Invited</i>) Stabilization of Fe-N<sub>4</sub> Sites by Platinum During Oxygen Reduction in Acid Medium
(<i>Invited</i>) Stabilization of Fe-N<sub>4</sub> Sites by Platinum During Oxygen Reduction in Acid Medium Open
The deployment of proton-exchange-membrane fuel cells is hindered by the large amount of Pt required for anode and cathode electrocatalysis. While Fe–N–C materials have shown promising initial oxygen reduction reaction (ORR) activity, they…
View article: Evidence for the stabilization of FeN4 sites by Pt particles during acidic oxygen reduction
Evidence for the stabilization of FeN4 sites by Pt particles during acidic oxygen reduction Open
While Fe–N–C materials have shown promising initial oxygen reduction reaction (ORR) activity, they lack durability in acidic medium. Key degradation mechanisms include FeN 4 site demetallation and deactivation by reactive oxygen species. H…
View article: Probing Strain in Individual Palladium Nanocrystals during Electrochemically Induced Phase Transitions
Probing Strain in Individual Palladium Nanocrystals during Electrochemically Induced Phase Transitions Open
The palladium-hydrogen system plays a crucial role in catalysis, hydrogen production and storage, hydrogen embrittlement, and sensing technologies. Understanding the transition of palladium nanocrystals (NCs) from the hydrogen-poor (α) pha…
View article: Tracing Pd and Pt Release during the Hydrogen Evolution Reaction Using Inductively Coupled Plasma Mass Spectrometry: Metal Dissolution, Nanoparticle Detachment, or Catalyst Layer Instability?
Tracing Pd and Pt Release during the Hydrogen Evolution Reaction Using Inductively Coupled Plasma Mass Spectrometry: Metal Dissolution, Nanoparticle Detachment, or Catalyst Layer Instability? Open
International audience
View article: Probing Strain in Individual Palladium Nanocrystals during Electrochemically-Induced Phase Transitions
Probing Strain in Individual Palladium Nanocrystals during Electrochemically-Induced Phase Transitions Open
The palladium-hydrogen system is essential for applications in water electrolysis, catalysis, hydrogen storage, and hydrogen sensing technologies. Understanding the transition of Pd nanocrystals from the hydrogen-poor (α) phase to the hydr…
View article: A Model Approach to Uncover the Role of the IrO<sub><i>x</i></sub> Crystallographic Structure and Chemistry on OER Activity and Stability via Annealing a Sacrificial Template
A Model Approach to Uncover the Role of the IrO<sub><i>x</i></sub> Crystallographic Structure and Chemistry on OER Activity and Stability via Annealing a Sacrificial Template Open
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View article: An aqua regia-free chemical recovery and reprecipitation of Ir from IrO<sub><i>x</i></sub> catalysts: optimisation of the extraction efficiency using surface response methodology
An aqua regia-free chemical recovery and reprecipitation of Ir from IrO<sub><i>x</i></sub> catalysts: optimisation of the extraction efficiency using surface response methodology Open
This study introduces a microwave assisted aqua-regia-free recycling process for Ir from IrO x catalysts. The experimental Ir extraction efficiency measured is 83 ± 10%. The leached Ir solution was then precipitated to form ((NH 4 ) 2 IrCl…
View article: Hydride‐Induced Reconstruction of Pd Electrode Surfaces: A Combined Computational and Experimental Study
Hydride‐Induced Reconstruction of Pd Electrode Surfaces: A Combined Computational and Experimental Study Open
Designing electrocatalysts with optimal activity and selectivity relies on a thorough understanding of the surface structure under reaction conditions. In this study, experimental and computational approaches are combined to elucidate reco…
View article: Fe‐N‐C in Proton Exchange Membrane Fuel Cells: Impact of Ionomer Loading on Degradation and Stability
Fe‐N‐C in Proton Exchange Membrane Fuel Cells: Impact of Ionomer Loading on Degradation and Stability Open
Fe single atoms in N‐doped C (Fe‐N‐C) present the most promising replacement for carbon‐supported Pt‐based catalysts for the O 2 reduction reaction at the cathode of proton exchange membrane fuel cells (PEMFCs). However, it remains unclear…
View article: Tracking the Early-life of PtNi/C Shape-Controlled Catalysts upon their Integration in PEMFC
Tracking the Early-life of PtNi/C Shape-Controlled Catalysts upon their Integration in PEMFC Open
The integration of promising bimetallic electrocatalytic active materials for oxygen reduction reaction (ORR) into practical and functional proton-exchange membrane fuel cell (PEMFC) electrodes remains largely impeded by the poor performan…
View article: Seeing Inside Palladium Hydrides with X-rays
Seeing Inside Palladium Hydrides with X-rays Open
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View article: Operando Fe Dissolution in Fe-N-C Electrocatalysts during Acidic Oxygen Reduction and Impact of Local pH Change
Operando Fe Dissolution in Fe-N-C Electrocatalysts during Acidic Oxygen Reduction and Impact of Local pH Change Open
Atomic Fe in N-doped C (Fe-N-C) catalysts provide the most promising non-precious metal O2 reduction activity at the cathodes of proton exchange membrane fuel cells. However, one of the biggest remaining challenges to address towards their…
View article: On the contact resistance between the anode and the porous transport layer in a proton exchange membrane water electrolyzer
On the contact resistance between the anode and the porous transport layer in a proton exchange membrane water electrolyzer Open
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View article: Top‐down Surfactant‐Free Synthesis of Supported Palladium‐Nanostructured Catalysts
Top‐down Surfactant‐Free Synthesis of Supported Palladium‐Nanostructured Catalysts Open
Nanostructured palladium (Pd) is a universal catalyst that is widely used in applications ranging from catalytic converters of combustion engine cars to hydrogenation catalysts in industrial processes. Standard protocols for synthesizing s…
View article: Top-down surfactant-free electrosynthesis of magnéli phase Ti<sub>9</sub>O<sub>17</sub> nanowires
Top-down surfactant-free electrosynthesis of magnéli phase Ti<sub>9</sub>O<sub>17</sub> nanowires Open
A simple electrochemical surfactant-free top-down methodology for the synthesis of nanowires with non-stoichiometric Magnéli phase Ti 9 O 17 is presented.
View article: <i>Operando</i> Fe dissolution in Fe–N–C electrocatalysts during acidic oxygen reduction: impact of local pH change
<i>Operando</i> Fe dissolution in Fe–N–C electrocatalysts during acidic oxygen reduction: impact of local pH change Open
Fe cations produced during the reduction of O 2 on Fe–N–C materials transform into Fe-oxides due to a local increase in pH.
View article: Electrochemistry in the Light of In Situ Bragg Coherent Diffraction Imaging
Electrochemistry in the Light of In Situ Bragg Coherent Diffraction Imaging Open
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View article: Imaging the evolution of strain in platinum nanoparticles under electrochemical control
Imaging the evolution of strain in platinum nanoparticles under electrochemical control Open
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View article: Hydrogen Trapping in Palladium Nanoparticles Revealed by Electrochemical, X-ray Scattering, and Spectrometric Measurements
Hydrogen Trapping in Palladium Nanoparticles Revealed by Electrochemical, X-ray Scattering, and Spectrometric Measurements Open
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View article: Structural evolution of nanoparticles under realistic conditions observed with Bragg coherent X-ray imaging
Structural evolution of nanoparticles under realistic conditions observed with Bragg coherent X-ray imaging Open
The advent of the new 4 th generation x-ray light sources represents an unprecedented opportunity to conduct in situ and operando studies on the structure of nanoparticles in reactive liquid or gas environments.
View article: Review on the Degradation Mechanisms of Metal-N-C Catalysts for the Oxygen Reduction Reaction in Acid Electrolyte: Current Understanding and Mitigation Approaches
Review on the Degradation Mechanisms of Metal-N-C Catalysts for the Oxygen Reduction Reaction in Acid Electrolyte: Current Understanding and Mitigation Approaches Open
One bottleneck hampering the widespread use of fuel cell vehicles, in particular of proton exchange membrane fuel cells (PEMFCs), is the high cost of the cathode where the oxygen reduction reaction (ORR) occurs, due to the current need of …