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
- 5Citations
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- 1Mentions
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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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S1381514823002213; http://dx.doi.org/10.1016/j.reactfunctpolym.2023.105718; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=85171620404&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S1381514823002213; https://dx.doi.org/10.1016/j.reactfunctpolym.2023.105718
Elsevier BV
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