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Calcined cobalt-chelated, N-containing poly(methylenediphenyl urea) as an ORR cathode catalyst

Reactive and Functional Polymers, ISSN: 1381-5148, Vol: 192, Page: 105718
2023
  • 5
    Citations
  • 0
    Usage
  • 4
    Captures
  • 1
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    5
    • Citation Indexes
      5
  • Captures
    4
  • Mentions
    1
    • News Mentions
      1
      • News
        1

Most Recent News

Findings from National Kaohsiung University of Science and Technology in the Area of Nanotechnology Reported [Calcined Cobalt-chelated, N-containing Poly(Methylenediphenyl Urea) As an Orr Cathode Catalyst]

2023 NOV 08 (NewsRx) -- By a News Reporter-Staff News Editor at Taiwan Daily Report -- Investigators discuss new findings in Nanotechnology. According to news

Article Description

A Co(II)-chelated poly(methylenediphenyl urea) (Co-PMDUr) is successfully prepared from the condensation reaction between 4,4′-methylene diphenyl diamine (MDA) and 4,4′-methylene diphenyl diisocyanate (MDI) in the presence of cobalt chloride (CoCl 2 ). After polymerization, the Co(II) ions chelate to the polymer backbones by coordinating with the urea units' carbonyl or amine groups, confirmed by the FTIR spectra. The Co-PMDUr converts to Co, N-codoped carbon network (Co-N-Cs) via calcination in nitrogen and ammonia gases. X-ray diffraction and Raman spectra of Co-N-Cs reveal the formation of highly conjugated carbon structure, similar to that of carbon nanotube (CNT) or carbon nano-ring (CNR) seen in SEM and TEM micropictures. Except for cobalt nitride (Co N), other nitrogen-related groups like pyridinic, graphitic, and pyrrolic-Ns are present in the Co-N-Cs, and higher temperature calcination creates more pyridinic-Ns and Co-Ns. The BET analysis reveals high surface area and micro-pores for Co-N-Cs. The current-voltage curves of Co-N-Cs show a significant oxygen reduction reaction (ORR) at ca. 0.8  V and a higher limited reduction current density (LRCD) than commercial platinum carbon (Pt/C) catalyst in the O 2 -saturated KOH(aq). The average number of electrons (n) transferred during ORR is close to 4. The Tafel slope of the Co-N-C catalyst is similar to Pt/C. The max. Current density (I max ) and max. Power density (P max ) of the single cell with Co-N-C cathodes is comparable to that of Pt/C with less decadency during long-term redox reaction testing.

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