Bifunctional Oxygen Reduction/Oxygen Evolution Activity of Mixed Fe/Co Oxide Nanoparticles with Variable Fe/Co Ratios Supported on Multiwalled Carbon Nanotubes

Karina Elumeeva, Mariya A. Kazakova, Dulce Maria Morales, Danea Medina, Alexander Selyutin, Georgiy Golubtsov, Yurii Ivanov, Vladimir Kuznetzov, Andrey Chuvilin, Hendrik Antoni, Martin Muhler, Wolfgang Schuhmann, Justus Masa

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A facile strategy is reported for the synthesis of Fe/Co mixed metal oxide nanoparticles supported on, and embedded inside, high purity oxidized multiwalled carbon nanotubes (MWCNTs) of narrow diameter distribution as effective bifunctional catalysts able to reversibly drive the oxygen evolution reaction (OER) and the oxygen reduction reaction (ORR) in alkaline solutions. Variation of the Fe/Co ratio resulted in a pronounced trend in the bifunctional ORR/OER activity. Controlled synthesis and in-depth characterization enabled the identification of an optimal Fe/Co composition, which afforded a low OER/OER reversible overvoltage of only 0.831V, taking the OER at 10mAcm-2 and the ORR at -1mAcm-2. Importantly, the optimal catalyst with a Fe/Co ratio of 2:3 exhibited very promising long-term stability with no evident change in the potential for both the ORR and the OER after 400 charge/discharge (OER/ORR) cycles at 15mAcm-2 in 6m KOH. Moreover, detailed investigation of the structure, size, and phase composition of the mixed Fe/Co oxide nanoparticles, as well as their localization (inside of or on the surface of the MWCNTs) revealed insight of the possible contribution of the individual catalyst components and their synergistic interaction in the catalysis.

Original languageEnglish
Pages (from-to)1204-1214
Number of pages11
JournalChemSusChem
Volume11
Issue number7
DOIs
Publication statusPublished - 9 Apr 2018

Keywords

  • Bifunctional catalysts
  • Fe/Co oxide nanoparticles
  • Multiwalled carbon nanotubes
  • Oxygen evolution
  • Oxygen reduction
  • multiwalled carbon nanotubes
  • oxygen evolution
  • bifunctional catalysts
  • oxygen reduction
  • WATER OXIDATION
  • IRON
  • ELECTROCATALYSTS
  • CO OXIDE
  • COBALT OXIDE
  • METAL
  • SPINEL OXIDES
  • CATALYSTS
  • IN-SITU
  • FE

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