Oxygen reduction in acid media catalyzed by heat treated cobalt tetraazaannulene supported on an active charcoal: correlations between the performances after longevity tests and the active site configuration as seen by XPS and ToF-SIMS

Gouérec, P.; Biloul, A.; Contamin, O.; Scarbeck, G.; Savy, M.; Riga, J.; Weng, Lt.; Bertrand, Patrick

doi:10.1016/s0022-0728(96)04895-4

Cited by 94 publications

(62 citation statements)

References 24 publications

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“…Gouérec et al [135] proposed a catalytic mechanism for CoTAA on the oxygen-reduction reaction as follows: The pyrolysis treatment improves the stability of CoTAA, although partial decomposition of CoTAA during the heat treatment is observed by XPS and ToF-SIMS. CoTAA supported on SX Ultra, after heat treatment at 600 °C, after the applied longevity tests (100 h), shows better performance than CoTMPP on the same support after the same heat treatment.…”

Section: Co-and Fe-based Tetraazaannulene (Taa)mentioning

confidence: 99%

Nonprecious metal catalysts for the molecular oxygen‐reduction reaction

Feng

Alonso-Vante

2008

Physica Status Solidi (b)

182

109

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This review covers the electrocatalytic activities, the corresponding influence factors and the synthesis methods of nonprecious‐metal electrocatalysts towards oxygen‐reduction reaction (ORR) for fuel‐cell systems. In particular, the chalcogenides and the macrocycles containing Co or Fe metals have been focused upon. Due to the scarcity of Pt metal, the Co‐ and Fe‐based chalcogenides are potentially interesting substitutes of Pt although they still show lower catalytic activities for ORR and lower electrochemical and chemical stability in the present fuel‐cell electrolytes. Compared to Pt electrocatalysts, the Co‐ and Fe‐based macrocycles, such as TMPP, TPP, Pc and TAA, are among the most promising substitutes for Pt because of their comparable catalytic activities towards ORR and the higher insensitivity to methanol (in direct methanol fuel cells – DMFC) although they still have some drawbacks, namely lower stability and shorter durability. Novel catalyst synthesis methods, modification techniques of catalysts as well as supporting substrates are expected to be developed in the future to satisfy the requirements of commercial fuel cells. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Co-and Fe-based Tetraazaannulene (Taa)mentioning

confidence: 99%

Nonprecious metal catalysts for the molecular oxygen‐reduction reaction

Feng

Alonso-Vante

2008

Physica Status Solidi (b)

182

109

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“…The intensity of the Co ions on the other hand remained constant, indicating that up to 700 C CoPc fragments containing Co and at higher temperature Co are responsible for the catalytic activity. Gouerec et al (1997) studied cobalt tetraazaannulene (CoTAA) on active coal and showed that CoTAA decomposed when deposited on the substrate but no change was seen after heat treatment.…”

Section: A Catalystsmentioning

confidence: 99%

Static secondary ion mass spectrometry (S-SIMS) Part 2: material science applications

Adriaens

Vaeck

Adams

1999

Mass Spectrom. Rev.

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“…Contrary to the notion that the macrocycle catalyst site remains unaffected, many researchers believe that the active macrocycle center is completely destroyed during pyrolysis and have used electrochemical cyclic voltammetry [14], Mössbauer spectroscopy [15], and X-ray absorption spectroscopy (XAS) [16] to confirm a change in the oxidation state and coordination of the metal species after pyrolysis. To depart further from macrocycle precursors, a variety of precursors without nitrogen-metal bonds but with simple elemental metal, carbon, and nitrogen containing reactant materials have been pyrolyzed to create active ORR catalysts [19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%