Methanol Tolerance of CN x Oxygen Reduction Catalysts

Biddinger, Elizabeth J.; Ozkan, Umit S.

doi:10.1007/s11244-007-9014-7

Cited by 34 publications

(20 citation statements)

References 31 publications

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“…Vulcan Carbon has no pyridinic nitrogen (or any nitrogen) on the surface and shows the worst ORR activity while CN x grown on Ni/Al 2 O 3 has an intermediate pyridinic nitrogen content and shows an intermediate ORR activity. This correlation between pyridinic nitrogen content and ORR activity has been reportedly previously [29,30,44]. Pyridinic nitrogen may be part of the ORR active site or may simply be a marker for edge plane exposure.…”

Section: Catalyst Surface Chemical Compositionsupporting

confidence: 78%

Correlation Between Oxygen Reduction Reaction and Oxidative Dehydrogenation Activities Over Nanostructured Carbon Catalysts

et al. 2010

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Nitrogen containing nano-structured carbon catalysts were grown on Fe/Al 2 O 3 and Ni/Al 2 O 3 supports using acetonitrile pyrolysis. The post-pyrolysis samples were tested for activity in the oxygen reduction reaction (ORR) and oxidative dehydrogenation (ODH) reaction. Samples were characterized using BET, XPS and TEM. The samples grown over iron containing supports gave the highest activity in both reactions. There was a strong correlation between ODH and ORR activity suggesting the possibility of a common active site between reactions with the quinone/hydroquinone group being a possible candidate. XPS analysis supported this hypothesis showing that catalysts with a higher percentage of oxygen in the form of quinones tend to have the highest ORR and ODH activity. XPS analysis also demonstrated that samples with higher pyridinic nitrogen content, which is a marker for edge plane exposure and may be a part of the ORR active site, gave higher ORR and ODH activity. TEM images confirm that samples with high pyridinic nitrogen content tend to form structures with higher edge plane exposure. Because the active site, regardless of its identity, likely lies on the graphitic edge plane, this leaves the possibility that a common active site is not necessary to explain the correlation between ODH and ORR activity.

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Section: Catalyst Surface Chemical Compositionsupporting

confidence: 78%

Correlation Between Oxygen Reduction Reaction and Oxidative Dehydrogenation Activities Over Nanostructured Carbon Catalysts

et al. 2010

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“…Particularly the above-discussed transition metal chalcogenides have been shown to perform well in DMFCs, with a performance superior to that of Pt [37]. Similar results have been obtained for metal/N/C catalysts [49] and with nanostructured nitrogen-modified carbons [67]. However, noble metal-based catalysts were also investigated with regard to methanol tolerance, including Pt-based materials [68].…”

Section: Direct Fuel Cellssupporting

confidence: 57%

Catalysis in Low‐Temperature Fuel Cells – An Overview

Schimpf

Bron

2012

Fuel Cell Science and Engineering

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“…The resulting materials were nitrogen-containing carbon nanostructures (CN x ) and they were used as catalysts for the oxygen reduction reaction (ORR) in PEM and direct methanol fuel cell (DMFC) cathodes [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%