Fe-N/C catalysts for oxygen reduction reaction supported on different carbonaceous materials. Performance in acidic and alkaline direct alcohol fuel cells

[Display omitted] •Fe-N/C catalysts for ORR prepared using Fe-phenanthroline and different C-supports.•Weight loss during pyrolysis and C-disordered phase amount affect the ORR activity.•ORR activity is more influenced by C-support in acidic than in alkaline conditions.•Influence of C-supports featu...

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Veröffentlicht in:Applied catalysis. B, Environmental Jg. 205; S. 637 - 653
Hauptverfasser: Osmieri, Luigi, Escudero-Cid, Ricardo, Armandi, Marco, Monteverde Videla, Alessandro H.A., García Fierro, José Luís, Ocón, Pilar, Specchia, Stefania
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Amsterdam Elsevier B.V 15.05.2017
Elsevier BV
Schlagworte:
Acetylene
Activation
Alcohols
Carbon
Carbonaceous materials
Catalysts
Chemical synthesis
Direct alcohol fuel cell
Drying
Durability
Ethanol
Fuel cells
Fuel technology
Fuels
Iron
Kinetics
Methanol
Multi wall carbon nanotubes
Nanotechnology
Nanotubes
Non-noble metal catalyst
Oxygen
Oxygen reduction reaction
Oxygen reduction reactions
pH effects
Platinum
Pyrolysis
Reaction kinetics
Rotating disk electrode
Rotating disks
X ray photoelectron spectroscopy
Non-noble metal catalyst
Durability
Oxygen reduction reaction
Rotating disk electrode
Direct alcohol fuel cell
ISSN:0926-3373, 1873-3883
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Zusammenfassung:[Display omitted] •Fe-N/C catalysts for ORR prepared using Fe-phenanthroline and different C-supports.•Weight loss during pyrolysis and C-disordered phase amount affect the ORR activity.•ORR activity is more influenced by C-support in acidic than in alkaline conditions.•Influence of C-supports features confirmed by acidic DMFC and alkaline DEFC tests.•Durability in acidic DMFC and alkaline DEFC was assessed. Four carbonaceous materials (acetylene black, multi-walled carbon nanotubes, and two carbon materials synthesized by hard-template method) were used as a support to synthesize four Fe-N/C non-noble metal (NNM) catalysts for oxygen reduction reaction (ORR) by impregnation with a FeIII–1,10-phenanthroline complex and subsequent pyrolysis in inert atmosphere. The catalysts were characterized by N2 physisorption, XPS, Raman and TGA, and their ORR activity was measured by rotating disk electrode (RDE) in both acidic and alkaline conditions. The catalysts were tested in an acidic direct methanol fuel cell (DMFC) and in an alkaline direct ethanol fuel cell (DEFC). Due to the slower ORR kinetics at low pH, the features of the carbon support have an important influence on the performance in acidic DMFC. Conversely, the enhanced ORR kinetics at high pH, makes the influence of the C-support less evident in alkaline DEFC. Moreover, the short-term durability test in DMFC for our best Fe-N/C catalysts showed better results compared to Pt/C benchmark catalyst. The durability in alkaline DEFC is poor, even though the initial performance can be partially recovered after purge-drying and reactivation.
Bibliographie:ObjectType-Article-1
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content type line 14
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2017.01.003