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Fe–N–C catalysts for oxygen electroreduction under external magnetic fields: Reduction of magnetic O2 to nonmagnetic H2O

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cris.lastimport.scopus2024-02-12T19:52:29Z
dc.abstract.enAn extensive analysis of iron-nitrogen-carbon (Fe–N–C) electrocatalysts synthesis and activity is presented concerning synthesis conditions such as initial Fe content, pyrolysis temperature and atmosphere (inert N2, reducing NH3, oxidizing Cl2 and their sequential combinations) and the influence of an external magnetic field on their performance in oxygen reduction reaction (ORR). Thermosetting porous polymers doped with FeCl3 were utilized as the Fe–N–C catalysts precursors. The pyrolysis temperature was varied within a 700–900 °C range. The temperature and atmosphere of pyrolysis strongly affect the porosity and composition of the resultant Fe–N–C catalysts, while the initial amount of Fe precursor shows much weaker impact. Pyrolysis under NH3 yields materials similar to those pyrolyzed under an inert atmosphere (N2). In contrast, pyrolysis under Cl2 yields carbon of peculiar character with highly disordered structure and extensive microporosity. The application of a static external magnetic field strongly enhances the ORR process (herein studied in an alkaline environment) and the enhancement correlates with the Fe content in the Fe–N–C catalysts. The Fe–N–C materials containing ferromagnetic iron phase embedded in N-doped microporous carbon constitute attractive catalysts for magnetic field-aided anion exchange membrane fuel cell technology.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorDyjak, Sławomir
dc.contributor.authorBudner, Bogusław
dc.contributor.authorSęk, Jakub P.
dc.contributor.authorKiciński, Wojciech
dc.contributor.authorSurdacka, Sylwia Turczyniak
dc.contributor.authorKowalczyk, Agata
dc.contributor.authorDonten, Mikołaj
dc.contributor.authorNowicka, Anna
dc.date.accessioned2024-01-25T00:39:52Z
dc.date.available2024-01-25T00:39:52Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.volume64
dc.identifier.doi10.1016/J.JECHEM.2021.04.048
dc.identifier.issn2095-4956
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/107051
dc.identifier.weblinkhttps://doi.org/10.1016/j.jechem.2021.04.048
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofJournal of Energy Chemistry
dc.relation.pages296-308
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enOxygen reduction reaction
dc.subject.enFe–N–C catalyst
dc.subject.enPGM-free catalyst
dc.subject.enMagnetic field
dc.subject.enChronoamperometry
dc.subject.enAnion exchange membrane fuel cell (AEMFC)
dc.titleFe–N–C catalysts for oxygen electroreduction under external magnetic fields: Reduction of magnetic O2 to nonmagnetic H2O
dc.typeJournalArticle
dspace.entity.typePublication