Synthesis and characterization of Pt3Co alloy magnetic nanoparticles in multidomain region for oxygen reduction reaction catalysts in PEMFCs

Jihyun Kim, Wonseok Yang, Jun Yeob Chung, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The structural and electrochemical characteristics of Pt3Co alloy nanoparticles as novel magnetic catalysts are investigated experimentally to improve the performance of the oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells (PEMFCs). Pt3Co alloy nanoparticles are synthesized using a wet chemical reduction and seed-mediated method. The synthesized Pt3Co alloy nanoparticles are annealed at 400 °C (Pt3Co-400) and 700 °C (Pt3Co-700) to increase the remanent magnetizations. The synthesized Pt3Co alloy nanoparticles for magnetic catalysts are characterized using physicochemical and electrochemical methods. Physicochemical tests confirm that the Pt3Co alloy nanoparticles are properly synthesized with the desired atomic ratio for magnetization in the multidomain region. The remanent magnetizations of the Pt3Co alloy nanoparticles substantially increase after annealing at 400 °C. For the rotating ring-disk electrode tests, the electrocatalytic performance improvement of Pt3Co alloy nanoparticles by magnetization is very small under the liquid electrolyte condition. However, the performances of PEMFCs using Pt3Co-400 alloy nanoparticles are substantially improved after magnetization owing to the enhanced ORR activities and oxygen diffusivity. In addition, the optimal operating conditions for PEMFCs using Pt3Co-400 magnetic catalysts are determined to be a higher reactant flow rate and lower operating temperature with a Pt-to-Pt3Co-400 mass ratio of 8:2.

Original languageEnglish
Pages (from-to)1484-1495
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume51
DOIs
Publication statusPublished - 2024 Jan 2

Bibliographical note

Publisher Copyright:
© 2023 Hydrogen Energy Publications LLC

Keywords

  • Alloy nanoparticle
  • Magnetization
  • Oxygen reduction reaction
  • Polymer electrolyte membrane fuel cell
  • Synthesis

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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