Microwave-Induced Structural Ordering of Resilient Nanostructured L1(0)-FePt Catalysts for Oxygen Reduction Reaction

• Published in: ACS applied energy materials Vol. 3; no. 10; p. 9785
• Main Authors: Sandstrom, Robin, Gracia-Espino, Eduardo, Annamalai, Alagappan, Persson, Per O A, Persson, Ingemar, Ekspong, Joakim, Barzegar, Hamid Reza, Wagberg, Thomas
• Format: Journal Article
• Language: English
• Published: 26-10-2020
• Subjects: L1 phase; structural ordering; electron microscopy; electrocatalysts; oxygen reduction reaction; FePt-nanoparticles
• ISSN: 2574-0962; 2574-0962
• DOI: 10.1021/acsaem.0c01368

We show how structurally ordered L1(0) face-centered tetragonal FePt nanoparticles are produced by a solid-state microwave-assisted synthesis method. The structural phase as well as the incorporated Fe into the nanoparticles is confirmed by X-ray diffraction and high-resolution high-angle annular dark field scanning transmission electron microscopy experiments. The prepared particles exhibit a remarkable resilience toward crystallite growth at high temperatures. Directly correlated to the L1(0) phase, the best oxygen reduction reaction characteristics are achieved for particles with a 1:1 Fe/Pt atomic ratio and an average size of similar to 2.9 nm, where Pt-specific evaluation provided a high mass and specific activity of similar to 570 A/g(pt) and similar to 600 mu A/cm(pt)(2) , respectively. results demonstrate that well-structured catalysts possessing activities vastly exceeding Pt/C (similar to 210 A/g(pt) and similar to 250 mu A/cm(pt)(2 )be synthesized through a fast and highly ecofriendly method. We note that the achieved mass activity represent a significant toward the theoretical maximum for fully ordered FePt nanoparticles.