Electro-oxidation of Glycerol on Carbon Supported Pt75CoxNi25-x (x = 0, 0.9, 12.5, 24.1 and 25) Catalysts in an Alkaline Medium

Electro-oxidation of Glycerol on Carbon Supported Pt75CoxNi25-x (x = 0, 0.9, 12.5, 24.1 and 25) Catalysts in an Alkaline Medium

Binary and ternary Pt 75 Co x Ni 25- x /C ( x  = 0, 0.9, 12.5, 24.1, and 25) electrocatalysts were prepared by a polyol method, and their activity for carbon monoxide and glycerol oxidation in alkaline media was compared to that of a conventional Pt/C catalyst. Formation of partially alloyed catalys...

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Bibliographic Details
Published in:Electrocatalysis Vol. 9; no. 6; pp. 673 - 681
Main Authors: de Araujo, Vanessa M. F., Antolini, Ermete, Pocrifka, Leandro A., Passos, Raimundo R.
Format: Journal Article
Language:English
Published: New York Springer US 01-11-2018
Springer Nature B.V
Subjects:
Carbon monoxide
Catalysis
Catalysts
Chemistry
Chemistry and Materials Science
Electrocatalysts
Electrochemistry
Energy Systems
Glycerol
Original Research
Oxidation
Physical Chemistry
Supported catalysts
Glycerol oxidation activity
Ni
Pt-Co/C, Pt-Ni/C, Pt
Co
C electrocatalysts
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Summary:Binary and ternary Pt 75 Co x Ni 25- x /C ( x  = 0, 0.9, 12.5, 24.1, and 25) electrocatalysts were prepared by a polyol method, and their activity for carbon monoxide and glycerol oxidation in alkaline media was compared to that of a conventional Pt/C catalyst. Formation of partially alloyed catalysts was detected by XRD analysis, with the most part of the non-precious metals in a non-alloyed form. The onset potential for carbon monoxide and glycerol oxidation on binary and ternary Pt 75 Co x Ni 25- x /C catalysts was lower than that on Pt/C. The higher activity for glycerol oxidation of the Pt 75 Co 0.9 Ni 24.1 /C and Pt 75 Co 12.5 Ni 12.5 /C catalysts than that of the parent binary catalysts was ascribed to the formation of highly active Co x Ni 1- x (OH) 2 /Co x Ni 1- x OOH redox couples with a Co/Ni atomic ratio ≤ 1. Conversely, the replacement of a small amount of Co (0.9 at.%) by Ni did not increase the glycerol oxidation activity of the resulting Pt 75 Co 24.1 Ni 0.9 /C catalyst. The higher activity for glycerol oxidation of Pt 75 Co 12.5 Ni 12.5 /C than that of Pt 75 Co 0.9 Ni 24.1 /C for potentials > 0.7 V vs. RHE, despite the lower Ni-based oxide content and the higher particle size, indicated that at these potentials, the Co 12.5 Ni 12.5 (OH) 2 /Co 12.5 Ni 12.5 OOH redox couple is more active for glycerol oxidation than the Co 0.9 Ni 24.1 /Co 0.9 Ni 24.1 OOH redox couple. Graphical Abstract ᅟ
ISSN:1868-2529
1868-5994
DOI:10.1007/s12678-018-0475-1