N,N′-Bis(salicylidene)ethylenediamine as a nitrogen-rich precursor to synthesize electrocatalysts with high methanol-tolerance for polymer electrolyte membrane fuel cell oxygen reduction reaction

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DOIResolve DOI: http://doi.org/10.1016/j.jpowsour.2014.03.017
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TypeArticle
Journal titleJournal of Power Sources
ISSN0378-7753
Volume260
Pages349356; # of pages: 8
SubjectActive site; Alkaline polymer electrolyte membrane; Methanol tolerance; Non-precious metal catalysts; Oxygen reduction reaction; Rotating disk electrodes; Rotating ring-disk electrode techniques; Solid-sate reactions; Alkaline fuel cells; Alkalinity; Carbon; Catalysis; Electrocatalysts; Electrolytes; Electrolytic reduction; Electron transitions; Methanol; Proton exchange membrane fuel cells (PEMFC); Rotating disks; Cobalt compounds
AbstractA cost-effective chemical, N,N′-bis(salicylidene)ethylenediamine (salen), is used as a ligand to form a carbon-supported Co-salen complex (Co-salen/C) by a simple solid-sate reaction. The Co-salen/C is then pyrolyzed at 600, 700, 800, 900, and 1000 °C to form carbon-supported Co-N-S/C catalysts for the oxygen reduction reaction (ORR). XRD, EDX, TEM, and XPS are used to characterize the catalysts' composition, crystalline nature, morphology, and possible surface groups induced by heat-treatment. Investigation of the catalytic activity and the ORR mechanisms using rotating disk electrode and rotating ring-disk electrode techniques demonstrates that all of these Co-N-S/C catalysts are highly active for the ORR in an O2-saturated 0.1 M KOH solution, but the catalyst heat treated at 700°C gives the best ORR activity. The overall electron transfer number for the catalyzed ORR was determined to be 3.6-3.9, with 3.7-19.9% H2O2 production over the potential range of -0.05 to -0.60 V, suggesting that the ORR catalyzed by Co-N-S/C catalysts is dominated by a 4-electron transfer pathway from O 2 to H2O. In addition, these catalysts exhibit superior methanol tolerance to commercial 40% Pt/C catalyst, thus the Co-N-S/C catalysts are promising for use as electrocatalysts in alkaline polymer electrolyte membrane fuel cells. © 2014 Elsevier B.V. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21272252
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Record identifier8d2048e6-95f0-49f8-9d0a-43d8e0f826c7
Record created2014-07-23
Record modified2016-05-09
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