Gas-Phase Synthesis of PtMo Alloy Electrocatalysts with Enhanced Activity and Durability for Oxygen Reduction Reaction

Hyunseok Yoon, Hee Jo Song, Bobae Ju, Kunik Jang, Dong Wan Kim

Research output: Contribution to journalArticlepeer-review

Abstract

The proton-exchange membrane fuel cell is a promising technology to effectively utilize hydrogen energy, which is the ideal alternative to fossil fuels. However, the high dependency on scarce Pt as an oxygen reduction reaction (ORR) electrocatalyst is still a severe barrier that hinders widespread commercialization. Herein, we propose a facile synthetic strategy facilitating mass production of Pt-Mo solid-solution alloy nanoparticles on a carbon support (PtMo/C) as a highly active ORR electrocatalyst. Without using organic surfactants or reducing agents, our synthesis process based on the gas-phase method in an inert atmosphere is cost-effective and does not require any post-treatment, unlike most reported solution-based reduction processes. Both molybdenum metal and carbon monoxide decomposed from molybdenum hexacarbonyl contribute to the reduction of the PtMo alloy during the annealing process. By elucidating the growth and synthesis mechanisms, we optimized the particle size of PtMo/C to approximately 3.1 nm, annealed at 800 °C (PtMo/C-800). Consequently, PtMo/C-800 shows high mass activity (146 mA mgPt-1), which is superior to that of commercial Pt/C, and excellent durability after accelerated degradation tests.

Original languageEnglish
Pages (from-to)15319-15327
Number of pages9
JournalACS Sustainable Chemistry and Engineering
Volume10
Issue number46
DOIs
Publication statusPublished - 2022 Nov 21

Keywords

  • Growth mechanism
  • Metal alloy
  • Oxygen reduction reaction
  • Size optimizing
  • Solid solution

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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