Publications by authors named "Elo Kibena-Poldsepp"

Rechargeable zinc-air batteries (RZAB) have gained significant attention as potential energy storage devices due to their high energy density, cost-effectiveness, and to the fact that they are environmentally safe. However, the practical implementation of RZABs has been impeded by challenges such as sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), including poor cyclability. Herein, we report the preparation of cobalt- and nitrogen-doped porous carbon derived from phloroglucinol-formaldehyde polymer networks with 2-methyl imidazole and cobalt phthalocyanine as precursors for nitrogen and cobalt.

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Transition-metal- and nitrogen-codoped carbide-derived carbon/carbon nanotube composites (M-N-CDC/CNT) have been prepared, characterized, and used as cathode catalysts in anion-exchange membrane fuel cells (AEMFCs). As transition metals, cobalt, iron, and a combination of both have been investigated. Metal and nitrogen are doped through a simple high-temperature pyrolysis technique with 1,10-phenanthroline as the N precursor.

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Article Synopsis
  • - Non-precious-metal catalysts show potential as eco-friendly substitutes for platinum in fuel cells, specifically for oxygen reduction and evolution reactions.
  • - The study focused on mixed metal phthalocyanine-modified carbon nanotubes, discovering that FeCoN-MWCNT and FeMnN-MWCNT exhibit strong oxygen reduction activity, while FeNiN-MWCNT performs well in the oxygen evolution reaction.
  • - The best-performing catalyst, FeCoN-MWCNT, achieved a peak power density of 692 mW/cm² when tested in anion-exchange membrane fuel cells, indicating promising efficiency for practical applications.
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