Activity and degradation study of an Fe-N-C catalyst for ORR in Direct Methanol Fuel Cell (DMFC)

Fe-N-C catalysts reveal good methanol tolerance making them suitable for DMFC application. However, the stability need to be further improved. [Display omitted] •Determination of the activation energy for a Fe-N-C catalyst.•Comparison of the durability in RDE in acidic electrolyte without and in the...

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Vydáno v:Applied catalysis. B, Environmental Ročník 262; s. 118217
Hlavní autoři: Martinaiou, Ioanna, Monteverde Videla, Alessandro H.A., Weidler, Natascha, Kübler, Markus, Wallace, W. David Z., Paul, Stephen, Wagner, Stephan, Shahraei, Ali, Stark, Robert W., Specchia, Stefania, Kramm, Ulrike I.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Amsterdam Elsevier B.V 01.03.2020
Elsevier BV
Témata:
Acetic acid
Catalysts
Chemical composition
Deactivation
Disintegration
Durability
Fuel cells
Fuel technology
Iron oxides
Maximum power density
Methanol
Mossbauer spectroscopy
Mössbauer spectroscopy
Organic chemistry
PGM-free catalyst
Polyanilines
Post-mortem characterization
Rotating disks
Stability
Temperature dependence
PGM-free catalyst
Stability
Post-mortem characterization
Mössbauer spectroscopy
ISSN:0926-3373, 1873-3883
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Shrnutí:Fe-N-C catalysts reveal good methanol tolerance making them suitable for DMFC application. However, the stability need to be further improved. [Display omitted] •Determination of the activation energy for a Fe-N-C catalyst.•Comparison of the durability in RDE in acidic electrolyte without and in the presence of methanol.•DMFC testing including stability of the Fe-N-C catalyst.•Post mortem Mössbauer spectroscopy. In this work a comprehensive study of the activity and stability of a non-precious metal catalyst of type Fe- N- C in acidic media is reported. The catalyst was prepared from polyaniline, dicyandiamide and iron acetate as precursors. Temperature-dependent rotating-disk electrode experiments were performed to determine the activation energy of the catalyst. Besides, load cycle durability tests with and without the addition of methanol show that there is no additional deactivation caused by methanol addition. In a Direct Methanol Fuel Cell (DMFCs) our catalyst performed similarly good in comparison to other Fe-N-C catalysts. Raman and Mössbauer spectroscopy provide valuable information on the structural composition and chemical changes induced by durability and stability testing of the catalyst. While the maximum power density during DMFC operation decreases by 85%, the qualitative distribution of iron sites might indicate the formation of iron and iron oxide clusters as decomposition product associated with the disintegration of FeN4 sites.
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content type line 14
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2019.118217