Bimetal Phthalocyanine‐Modified Carbon Nanotube‐Based Bifunctional Catalysts for Zinc‐Air Batteries

  • Yogesh Kumar
    Institute of Chemistry University of Tartu Ravila 14a 50411 Tartu Estonia
  • Elo Kibena‐Põldsepp
    Institute of Chemistry University of Tartu Ravila 14a 50411 Tartu Estonia
  • Jekaterina Kozlova
    Institute of Physics University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
  • Arvo Kikas
    Institute of Physics University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
  • Maike Käärik
    Institute of Chemistry University of Tartu Ravila 14a 50411 Tartu Estonia
  • Jaan Aruväli
    Institute of Ecology and Earth Science University of Tartu Vanemuise 46 51014 Tartu Estonia
  • Vambola Kisand
    Institute of Physics University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
  • Jaan Leis
    Institute of Chemistry University of Tartu Ravila 14a 50411 Tartu Estonia
  • Aile Tamm
    Institute of Physics University of Tartu W. Ostwald Str. 1 50411 Tartu Estonia
  • Kaido Tammeveski
    Institute of Chemistry University of Tartu Ravila 14a 50411 Tartu Estonia

抄録

<jats:title>Abstract</jats:title><jats:p>A series of non‐precious bifunctional electrocatalysts composed of first‐row transition metal phthalocyanine (MPc, M=Mn, Ni, Co) modified multi‐walled carbon nanotubes (CNTs) was prepared and examined for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline media. The use of MPc in carbon matrix is attractive due to the formation of M‐N<jats:sub>x</jats:sub> sites, which are responsible for ORR electrocatalysis and transition metal oxides that are OER‐active. Physical characterisation of the prepared catalysts was carried out by scanning electron microscopy/energy dispersive X‐ray spectroscopy, scanning transmission electron microscopy, N<jats:sub>2</jats:sub> physisorption analysis, X‐ray diffraction and X‐ray photoelectron spectroscopy. The highest ORR activity among bimetallic catalysts was shown by a MnCoN‐CNT catalyst with half‐wave potential of 0.84 V. The electrochemical results of the prepared bimetallic catalysts revealed superior OER activity of NiCoN‐CNT with <jats:italic>E</jats:italic><jats:sub>OER</jats:sub> of 1.61 V at 10 mA cm<jats:sup>−2</jats:sup> and also good ORR activity (<jats:italic>E</jats:italic><jats:sub>1/2</jats:sub>=0.83 V). Furthermore, NiCoN‐CNT exhibited excellent stability for both, ORR and OER, with only 5 mV change in half‐wave potential and only 14 mV loss in <jats:italic>E</jats:italic><jats:sub>OER</jats:sub>, respectively. For checking bifunctionality, the NiCoN‐CNT catalyst was used as an air electrode and tested for zinc‐air battery (ZAB). Good ZAB performance was obtained, with open circuit voltage (OCV) of 1.338 V.</jats:p>

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