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Iron oxide decorated N-doped carbon derived from Poly (ferrocene-urethane) interconnects for oxygen reduction reaction


We report the synthesis of mixed iron oxide particles decorated on nitrogen-doped carbon by forming covalent polyurethane linkages between ferrocene and phloroglucinol. Contrasting the electrostatic interactions and the physical cross-linking of the Fe/N/C precursors, here the poly(ferrocene-urethane) (PFU) were acquired exclusively by the (i) Conversion of dicarboxylic acids present in ferrocene to azide linkages; (ii) Chemically linking the ferrocene-diazides to phloroglucinol through urethane bonds. The as obtained poly(ferrocene-urethane) were pyrolyzed under argon at elevated temperatures (600, 800 and 1000 oC) to yield iron oxide decorated N-doped carbon interconnects. The resultant porous materials were found to have a right balance of hierarchical porosity (micro-meso and macro-), N-doping and iron oxide phases in and onto the carbon matrices respectively. Among the PFU samples pyrolyzed at different temperatures, the sample pyrolyzed at 800 oC displayed more positive onset potential, higher current density, and direct four electron transfer kinetics with lesser yield of H2O2 (5.6%) on par with the commercially available Pt catalysts for oxygen reduction reaction (ORR) in alkaline KOH solution. The superior electrocatalytic activity of PFU-800 can be traced to the synergistic effect between iron oxide and N-doping on the porous carbon nanostructures and the balanced hierarchial porosity. The developed non-Pt based electrocatalyst can be considered as one of the promising electrocatalysts in alkaline fuel cell applications.

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Publication details

The article was received on 22 May 2018, accepted on 29 Jul 2018 and first published on 30 Jul 2018

Article type: Paper
DOI: 10.1039/C8NJ02529K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Iron oxide decorated N-doped carbon derived from Poly (ferrocene-urethane) interconnects for oxygen reduction reaction

    N. Chandrasekaran, V. Premkumar, M. Kathiresan, K. Madasamy, K. Pandiyaraj and S. Senthil Kumar, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02529K

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