J. Mater. Sci. Technol. ›› 2025, Vol. 212: 139-147.DOI: 10.1016/j.jmst.2024.06.009

• Research Article • Previous Articles     Next Articles

Epitaxial growth of highly atomically ordered Pt-Fe nanoparticles from carbon nanotube bundles as durable oxygen reduction electrocatalysts

Juan Hea,b, Chao Chena,b, Hailong Yua,b, Yang Zhaob, Ming Xub, Ting Xiongc, Qiuhong Luc, Zhi Yua,b,*, Kaiping Taia,b,*, Jun Tanc,*, Chang Liua,b,*   

  1. aSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    bShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    cJi Hua Laboratory, Forshan 528200, China
  • Received:2024-01-30 Revised:2024-04-17 Accepted:2024-06-04 Published:2025-03-20 Online:2025-03-14
  • Contact: *E-mail addresses: zyu@imr.ac.cn (Z. Yu), kptai@imr.ac.cn (K. Tai), tanjun@jihualab.com (J. Tan), cliu@imr.ac.cn (C. Liu)

Abstract: Intermetallic Pt-based nanoparticles have displayed excellent activity for the oxygen reduction reaction (ORR) in fuel cells. However, it remains a great challenge to synthesize highly atomically ordered Pt-based nanoparticle catalysts because the formation of an atomically ordered structure usually requires high-temperature annealing accompanied by grain sintering. Here we report the direct epitaxial growth of well-aligned, highly atomically ordered Pt3 Fe and PtFe nanoparticles (<5 nm) on single-walled carbon nanotube (SWCNT) bundles films. The long-range periodically symmetric van der Waals (vdW) interac-tions between SWCNT bundles and Pt-Fe nanoparticles play an important role in promoting not only the alignment ordering of inter-nanoparticles but also the atomic ordering of intra-nanoparticles. The ordered Pt3 Fe/SWCNT catalyst showed enhanced ORR catalytic performance of 2.3-fold higher mass activity and 3.1-fold higher specific activity than commercial Pt/C. Moreover, the formation of an interlocked inter-face and strong vdW interaction endow the Pt-Fe/SWCNT catalysts with extreme long-term stability in potential cycling and excellent anti-thermal sintering ability.

Key words: Epitaxial growth, Carbon nanotube, PtFe nanoparticles, Oxygen reduction reaction, Catalytic stability, Periodically symmetric van der Waals, (vdW) interactions