Palladium/Cobalt Coated on Multi-Walled Carbon Nanotubes as an Electro-catalyst for Oxygen Reduction Reaction in Passive Direct Methanol Fuel Cells.
In: Fuel Cells, Jg. 13 (2013-12-01), Heft 6, S. 987-1003
Online
academicJournal
Zugriff:
This work reports the synthesis of Pd-based alloy electrocatalysts of Co supported on multi-walled carbon nanotubes (MWCNTs) and their evaluation as cathode materials in a passive direct methanol fuel cell (PDMFC). The X-ray diffraction (XRD) analysis showed well-defined reflections corresponding to a face centered cubic phase of palladium. As compared to the Pd/MWCNT electrocatalyst, the bimetallic alloy electrocatalysts with the different Pd xCo atomic ratios showed highly enhanced mass activity (MA) for the oxygen reduction reaction (ORR); however, the significant enhancement in the specific activity (SA) by a factor of about 1.2-5.6 for the ORR was found on the Pd xCo alloy electrocatalysts in the presence and absence of methanol electrolyte solution. This enhancement SA in of the Pd-based electrocatalysts was correlated to the changes in the lattice parameter and Pd xCo surface composition. Surface area changes of Pd-based electrocatalysts supported on MWCNT were evaluated using an accelerated durability test (ADT). The results obtained using the ADT were correlated to the performance of the Pd-based electrocatalysts in the PDMFC. A better performance was obtained for the cell using Pd3Co/MWCNT (2.53 mW cm-2) compared to Pd/MWCNT (1.64 mW cm-2) and Pt/C-Electrochem (1.20 mW cm-2) as cathode in the PDMFC. In the presence and absence of methanol the impedance Bode spectra showed one time constant that associated to follow a four electron pathway. [ABSTRACT FROM AUTHOR]
Titel: |
Palladium/Cobalt Coated on Multi-Walled Carbon Nanotubes as an Electro-catalyst for Oxygen Reduction Reaction in Passive Direct Methanol Fuel Cells.
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Autor/in / Beteiligte Person: | Gharibi, H. ; Golmohammadi, F. ; Kheirmand, M. |
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Zeitschrift: | Fuel Cells, Jg. 13 (2013-12-01), Heft 6, S. 987-1003 |
Veröffentlichung: | 2013 |
Medientyp: | academicJournal |
ISSN: | 1615-6846 (print) |
DOI: | 10.1002/fuce.201200220 |
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