http://www.cnr.it/ontology/cnr/individuo/prodotto/ID169469
Single-Site and Nanosized Fe-Co Electrocatalysts for Oxygen Reduction: Synthesis; Characterization and Catalytic Performance (Articolo in rivista)
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- Label
- Single-Site and Nanosized Fe-Co Electrocatalysts for Oxygen Reduction: Synthesis; Characterization and Catalytic Performance (Articolo in rivista) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1016/j.jpowsour.2010.11.030 (literal)
- Alternative label
Bambagioni, V.; Bianchini, C.; Filippi, J.; Lavacchi, A.; Oberhauser, W.; Marchionni, A.; Moneti, S.; Vizza, F.; Psaro, R.; Dal Santo, V.; Gallo, A.; Recchia, S.; Sordelli, L. (2011)
Single-Site and Nanosized Fe-Co Electrocatalysts for Oxygen Reduction: Synthesis; Characterization and Catalytic Performance
in Journal of power sources (Print)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Bambagioni, V.; Bianchini, C.; Filippi, J.; Lavacchi, A.; Oberhauser, W.; Marchionni, A.; Moneti, S.; Vizza, F.; Psaro, R.; Dal Santo, V.; Gallo, A.; Recchia, S.; Sordelli, L. (literal)
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- doi:10.1016/j.jpowsour.2010. 11.030 (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- Istituto di Chimica dei Composti Organometallici (ICCOM-CNR), I-50019 Sesto Fiorentino, Florence, Italy
Istituto di Scienze e Tecnologie Molecolari (ISTM-CNR), I-20133 Milano, Italy
Istituto di Scienze e Tecnologie Molecolari (ISTM-CNR), I-20138 Milano, Italy
Dipartimento di Scienze Chimiche, Università degli Studi dellInsubria, I-22100 Como, Italy (literal)
- Titolo
- Single-Site and Nanosized Fe-Co Electrocatalysts for Oxygen Reduction: Synthesis; Characterization and Catalytic Performance (literal)
- Abstract
- The impregnation of Ketjen Black (C) with iron and cobalt phthalocyanines (MPc) taken one by one or as a 1:1 stoichiometric mixture, followed by heat treatment at 600 °C under inert atmosphere, gave materials containing arrays of single metal ions coordinated by four nitrogen atoms (M-N4 units). Increasing the pyrolysis temperature to 800° resulted in the formation of carbon-supported, nanosized metal particles. A key role of the carbon support in determining the material structure at either temperature investigated was demonstrated by TPD, EXAFS, XANES and XRPD studies. These also showed that a FeCo alloy is obtained at 800 °C when the impregnation of Ketjen Black involves a mixture of FePc and CoPc. Electrodes coated with the different Fe, Co and FeCo materials, containing ca. 3 wt% metal loadings, were scrutinized for the oxygen reduction reaction (ORR) in alkaline media by linear sweep voltammetry. For comparative purposes, two Pt electrocatalysts containing 3 and 20 wt% metal were investigated. The electrochemical activity of all materials was analyzed by Tafel and KouteckyLevich plots as well as chronopotentiometry. The Fe-containing electrocatalysts have been found to be highly active for the ORR in alkaline media with convective limiting currents as high as 600 A g Fe-1 at room temperature and onset potentials as high as 1.02 V vs. RHE. It has been found that (i) the ORR mass activity of the Pc-derived electrocatalysts is superior to that of the Pt catalysts investigated; (ii) the activity of FePc and FePcCoPc/C, heat treated at either 600 or 800 °C, is superior to that of the corresponding Co materials; (iii) the electrocatalysts obtained at 600 °C are fairly more active than those obtained at 800 °C. (literal)
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