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Mixed Metal Phthalocyanine-Modified Carbon Nanotubes for Bifunctional Oxygen Reduction and Evolution Reaction

Wednesday, 1 June 2022: 11:05
West Meeting Room 219 (Vancouver Convention Center)
Y. Kumar, E. Kibena-Põldsepp (Institute of Chemistry, University of Tartu), J. Kozlova, M. Rähn (Institute of Physics, University of Tartu), A. Treshchalov (University of Tartu), A. Kikas (Institute of Physics, University of Tartu), V. Kisand (University of Tartu), J. Aruväli (Institute of Ecology and Earth Sciences, University of Tartu), A. Tamm (University of Tartu), J. C. Douglin (Technion - Israel Institute of Technology), S. J. Folkman, I. Gelmetti, F. Garcés Pineda, J. R. Galan-Mascaros (ICIQ, Barcelona Institute of Science and Technology), D. R. Dekel (Technion - Israel Institute of Technology), and K. Tammeveski (Institute of Chemistry, University of Tartu)
In this ever-expanding world, researchers are focused on changing how we consume energy. Progress has been made over time, but the devices such as low-temperature polymer electrolyte fuel cells and metal-air batteries that can replace the conventional fossil fuel engines still use noble metal catalysts,1 which hinders the mass production and long-term usage of the devices. Transition metal macrocyclic (MN4-type) catalysts are good alternatives for the noble metal catalysts due to their low-price and promising electrocatalytic activity.2 Thus, the aim of this study was to develop the bifunctional ORR/OER electrocatalysts using mixed transition metal phthalocyanine-modified multi-walled carbon nanotubes (MWCNT) by simple pyrolysis method.3

Among the prepared bifunctional catalysts, FeCoN-MWCNT showed the superior electrocatalytic ORR activity in alkaline media with half-wave potential of 0.86 V vs RHE and FeNiN-MWCNT catalyst exhibited the exceptional OER activity with Ej=10 mA cm–2 of 1.58 V (see Fig. 1a, b). Physical characterization of the prepared catalysts was investigated with (scanning) electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy. Further, catalysts were tested in anion-exchange membrane fuel cells (AEMFCs) as cathode material and very good peak power density of 692 mW cm–2 was obtained for FeCoN-MWCNT (see Fig. 1c). FeNiN-MWCNT was tested in anion-exchange membrane electrolyzer (AEMEL) and showed comparable results with state-of-the-art RuO2 catalysts (Fig. 1d). Altogether, this study unveils the insight into potential ways of preparing the bifunctional ORR/OER electrocatalysts with transition metal macrocyclic-based compounds.

References

  1. S. Hussain, H. Erikson, N. Kongi, A. Sarapuu, J. Solla-Gullón, G. Maia, A. M. Kannan, N. Alonso-Vante, K. Tammeveski, Int. J. Hydrogen Energy, 45, 31775-31797 (2020).
  2. A. Sarapuu, E. Kibena-Põldsepp, M. Borghei, K. Tammeveski, J. Mater. Chem. A, 6, 776–804 (2018).
  3. Y. Kumar, E. Kibena-Põldsepp, J. Kozlova, M. Rähn, A. Treshchalov A. Kikas, V. Kisand, J. Aruväli, A. Tamm, J. C. Douglin, S. J. Folkman, I. Gelmetti, F. A. Garcés-Pineda, J. R. Galán-Mascarós, D. R. Dekel, K. Tammeveski, ACS Appl. Mater. Interfaces, 13, 41507–41516 (2021).

See more of: I02 - Bifunctional Catalysts
See more of: I02: Hydrogen or Oxygen Evolution Catalysis for Water Electrolysis 8
See more of: Fuel Cells, Electrolyzers, and Energy Conversion
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