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Kumar, Kavita
Laboratoire d’Electrochimie et de Physico-chimie des Matériaux et des Interfaces
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2024Operando Fe dissolution in Fe–N–C electrocatalysts during acidic oxygen reduction: Impact of local pH changecitations
- 2023New insights on Fe–N–C catalyst structure from valence-to-core X-ray emission and absorption spectroscopiescitations
- 2023Enhancement of HER activity and stability of MoS2/C catalysts by doping with Co or Pt,Co single atoms
- 2023Modulating the Fe–N 4 Active Site Content by Nitrogen Source in Fe–N–C Aerogel Catalysts for Proton Exchange Membrane Fuel Cellcitations
- 2023Modulating the Fe–N 4 Active Site Content by Nitrogen Source in Fe–N–C Aerogel Catalysts for Proton Exchange Membrane Fuel Cellcitations
- 2022Aerogel-Derived Fe-N-C Catalysts for Oxygen Electro-Reduction. Linking Their Pore Structure and PEMFC Performance
- 2021Fe-N-Carbon aerogel catalyst for oxygen reduction reaction
- 2021Fe-N-Carbon Aerogel Catalysts with Enhanced Mass Transfer Property in Proton Exchange Membrane Fuel Cells
- 2020On the Influence of Oxygen on the Degradation of Fe‐N‐C Catalystscitations
- 2018Metal Loading Effect on the Activity of Co 3 O 4 /N-Doped Reduced Graphene Oxide Nanocomposites as Bifunctional Oxygen Reduction/Evolution Catalystscitations
- 2016Effect of the Oxide–Carbon Heterointerface on the Activity of Co3O4/NRGO Nanocomposites toward ORR and OERcitations
Places of action
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document
Fe-N-Carbon aerogel catalyst for oxygen reduction reaction
Abstract
Proton exchange membrane fuel cell (PEMFC)s are an excellent energy conversion device for wide application of hydrogen, especially for portable or transportation applications. To reduce the total cost of these devices, non-precious-metal catalysts (NPMCs) have shown promises in replacing platinum-based catalysts. Among NPMCs, iron-nitrogen-carbon (Fe-N-C) catalysts subclass are the most mature. These catalysts are based on nitrogen (N) coordinated iron (Fe) ions embedded in a carbon (C) matrix acting as catalytically active centers. Numerous studies have focused on promoting their catalytic performance towards the oxygen reduction reaction (ORR). Nevertheless, such materials remain less performant than carbon-supported platinum nanoparticles (Pt/C), leading to ca. 3-10 times thicker cathodes, and associated mass transport limitations.Carbon aerogels are ideal candidates to synthesize Fe-N-C catalysts with tuneable mass transport properties thanks to their tridimensional open texture, tailored pore size distribution from micro to macropores and their good electrical conductivity. Herein, we show the promises of Fe-N-C aerogels synthesized a “one pot” sol-gel method comprising formation of a Fe-doped resorcinol (R)-formaldehyde (F)-melamine (M) hydrogel, and followed by carbon dioxide (CO2) supercritical drying, and high temperature pyrolysis under N2 and NH3 atmosphere. By introducing ligands in the synthesis mixture, we modified the chemical environment of the Fe precursor. The resulting changes in morphology, ORR activity and mass transport properties are investigated a rotating disk electrode (RDE) set-up and a PEMFC device.