Ethanol oxidation reaction on PtCeO sub(2)/C electrocatalysts prepared by the polymeric precursor method
This paper presents a study of the electrocatalysis of ethanol oxidation reactions in an acidic medium on Pt-CeO sub(2)/C (20 wt.% of Pt-CeO sub(2) on carbon XC-72R), prepared in different mass ratios by the polymeric precursor method. The mass ratios between Pt and CeO sub(2) (3:1, 2:1, 1:1, 1:2, 1...
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| Published in: | Applied catalysis. B, Environmental Vol. 91; no. 1-2; pp. 516 - 523 |
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| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
01-09-2009
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| Online Access: | Get full text |
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| Summary: | This paper presents a study of the electrocatalysis of ethanol oxidation reactions in an acidic medium on Pt-CeO sub(2)/C (20 wt.% of Pt-CeO sub(2) on carbon XC-72R), prepared in different mass ratios by the polymeric precursor method. The mass ratios between Pt and CeO sub(2) (3:1, 2:1, 1:1, 1:2, 1:3) were confirmed by Energy Dispersive X-ray Analysis (EDAX). X-ray diffraction (XRD) structural characterization data shows that the Pt-CeO sub(2)/C catalysts are composed of nanosized polycrystalline non-alloyed deposits, from which reflections corresponding to the fcc (Pt) and fluorite (CeO sub(2)) structures were clearly observed. The mean crystallite sizes calculated from XRD data revealed that, independent of the mass ratio, a value close to 3 nm was obtained for the CeO sub(2) particles. For Pt, the mean crystallite sizes were dependent on the ratio of this metal in the catalysts. Low platinum ratios resulted in small crystallites, and high Pt proportions resulted in larger crystallites. The size distributions of the catalysts particles, determined by XRD, were confirmed by Transmission Electron Microscope (TEM) imaging. Cyclic voltammetry and chronoamperometic experiments were used to evaluate the electrocatalytic performance of the different materials. In all cases, except Pt-CeO sub(2)/C 1:1, the Pt-CeO sub(2)/C catalysts exhibited improved performance when compared with Pt/C. The best result was obtained for the Pt-CeO sub(2)/C 1:3 catalyst, which gave better results than the Pt-Ru/C (Etek) catalyst. |
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| Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 content type line 23 ObjectType-Feature-1 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2009.06.022 |