Abstract
We show how structurally ordered L10 face-centered tetragonal (fct) FePt nanoparticles are produced by a solid-state microwave-assisted synthesis method. The structural phase as well as the incorpo ...
Highlights
Proton exchange membrane fuel cells (PEMFCs) offer a sustainable energy alternative to internal combustion engines in vehicles by directly converting hydrogen into electricity. Their performance is limited by the sluggish kinetics of the cathodic oxygen reduction reaction (ORR), requiring high loading of Pt catalysts to meet the standards in the automotive industry
We have realized a structural ordering of FePtNPs into a L10 phase with high exposure of the Pt surface area, leading to a significant enhancement in catalytic ORR activity
The structural ordering can be achieved without compromising the FePt NP size, which is explained by an efficient local heating and a firm anchorage to the carbon support
Summary
Proton exchange membrane fuel cells (PEMFCs) offer a sustainable energy alternative to internal combustion engines in vehicles by directly converting hydrogen into electricity. Their performance is limited by the sluggish kinetics of the cathodic oxygen reduction reaction (ORR), requiring high loading of Pt catalysts to meet the standards in the automotive industry. The FePt (1:1) lattice may exist in either a disordered facecentered cubic (fcc) or as a structurally ordered face-centered tetragonal (fct) phase, where the latter normally displays greater ORR activity and durability.[7−10] to transform fcc NPs into the fct structure, typically a temperature around 600 °C is required This often leads to problematic NP growth, resulting in lowered Pt-specific electrochemically active surface area (ECSA).[11].
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