Core/shell Cu/FePtCu nanoparticles with face-centered tetragonal texture: An active and stable low-Pt catalyst for enhanced oxygen reduction

Xu Chen (1) , Hanbin Wang (1) , Houzhao Wan (1) , Tianci Wu (1) , Dan Shu (1) , Laifa Shen (2) , Yi Wang (2) , Pierre Ruterana (3) , Peter Lund (4) , Hao Wang (1)

1 PES - Faculty of Physics and Electronic Science
2 Max Planck Institute for Solid State Research
3 CIMAP - UMR 6252 - Centre de recherche sur les Ions, les MAtériaux et la Photonique
4 Department of Applied Physics [Aalto]

Low-Pt based nanocrystals demonstrate potential as highly active catalysts for the oxygen reduction reaction (ORR), but they suffer from undesirable structural degradation. Therefore, it is highly challenging to optimize their surface and interfacial structures to tune their catalytic properties for both activity and stability. Here core–shell Cu/FePtCu nanoparticles with a face-centered-tetragonal phase are prepared by a facile one–pot polyol method at 320 °C. The optimized core–shell Fe45Pt35Cu20 catalyst with Pt-enriched surface exhibits 0.5 A/mgPt mass activity, which is a factor of 4 better than that of commercial Pt/C (0.13 A/mgPt). In addition, the current density of the catalyst drops only 3.0% after 1000 cycles, which is much better than Pt/C (34.2% decay). Using aberration-corrected scanning transmission electron microscopy and atomically resolved elemental mapping, the morphology and structure evolving between the FePtCu alloy and core–shell Cu/FePtCu could clearly be explained. This work demonstrates that an ordered and core–shell FePtCu catalyst is highly promising for ORR and other electrochemical processes.

Domaines: Matériaux; Cristallographie; Physique [physics]

Xu Chen, Hanbin Wang, Houzhao Wan, Tianci Wu, Dan Shu, et al.. Core/shell Cu/FePtCu nanoparticles with face-centered tetragonal texture: An active and stable low-Pt catalyst for enhanced oxygen reduction. Nano Energy, 2018, 54, pp.280-287. ⟨10.1016/j.nanoen.2018.10.034⟩. ⟨hal-02340857⟩