Pt, PtCo and PtNi electrocatalysts prepared by mechanical alloying for the oxygen reduction reaction in 0.5 M H<inf>2</inf>SO<inf>4</inf>

M. A. García-Contreras, S. M. Fernández-Valverde, J. R. Vargas-García, M. A. Cortés-Jácome, J. A. Toledo-Antonio, C. Ángeles-Chavez

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Abstract

Electrocatalysts of Pt, PtCo and PtNi powders for the oxygen reduction reaction (ORR) were processed by Mechanical Alloying. Physical characterization was made by X-ray diffraction, scanning electron microscopy and scanning transmission electron microscopy. It was found that milled powders formed agglomerates in the range of 0.2-20 μm formed by nanometric size crystallites. The synthesized powders were alloys of PtFe, PtCoFe and PtNiFe due to iron incorporation during the milling process. The binding energies of Pt in the alloys were determined by XPS. Polarization curves were obtained by Rotating Disk Electrode technique in 0.5 M H2SO4 to determine the electrocatalytic activity of the mechanically alloyed powders. Tafel curves were plotted and kinetic parameters for the ORR were calculated. The PtFe alloy showed the highest electrocatalytic activity for the ORR. However, the lowest overpotential was found for the PtCoFe alloy and it also showed a higher current exchange density. A linear relationship was found between the Pt-binding energy in the alloys and the overpotential at the same current density independent of the Pt alloy composition. © 2008 International Association for Hydrogen Energy.
Original languageAmerican English
Pages (from-to)6672-6680
Number of pages6003
JournalInternational Journal of Hydrogen Energy
DOIs
StatePublished - 1 Nov 2008

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electrocatalysts
Electrocatalysts
Mechanical alloying
alloying
Oxygen
oxygen
Powders
Binding energy
binding energy
Scanning electron microscopy
scanning electron microscopy
rotating disks
Rotating disks
curves
Crystallites
Kinetic parameters
crystallites
high current
Current density
X ray photoelectron spectroscopy

Cite this

García-Contreras, M. A. ; Fernández-Valverde, S. M. ; Vargas-García, J. R. ; Cortés-Jácome, M. A. ; Toledo-Antonio, J. A. ; Ángeles-Chavez, C. / Pt, PtCo and PtNi electrocatalysts prepared by mechanical alloying for the oxygen reduction reaction in 0.5 M H<inf>2</inf>SO<inf>4</inf>. In: International Journal of Hydrogen Energy. 2008 ; pp. 6672-6680.
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abstract = "Electrocatalysts of Pt, PtCo and PtNi powders for the oxygen reduction reaction (ORR) were processed by Mechanical Alloying. Physical characterization was made by X-ray diffraction, scanning electron microscopy and scanning transmission electron microscopy. It was found that milled powders formed agglomerates in the range of 0.2-20 μm formed by nanometric size crystallites. The synthesized powders were alloys of PtFe, PtCoFe and PtNiFe due to iron incorporation during the milling process. The binding energies of Pt in the alloys were determined by XPS. Polarization curves were obtained by Rotating Disk Electrode technique in 0.5 M H2SO4 to determine the electrocatalytic activity of the mechanically alloyed powders. Tafel curves were plotted and kinetic parameters for the ORR were calculated. The PtFe alloy showed the highest electrocatalytic activity for the ORR. However, the lowest overpotential was found for the PtCoFe alloy and it also showed a higher current exchange density. A linear relationship was found between the Pt-binding energy in the alloys and the overpotential at the same current density independent of the Pt alloy composition. {\circledC} 2008 International Association for Hydrogen Energy.",
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Pt, PtCo and PtNi electrocatalysts prepared by mechanical alloying for the oxygen reduction reaction in 0.5 M H<inf>2</inf>SO<inf>4</inf> / García-Contreras, M. A.; Fernández-Valverde, S. M.; Vargas-García, J. R.; Cortés-Jácome, M. A.; Toledo-Antonio, J. A.; Ángeles-Chavez, C.

In: International Journal of Hydrogen Energy, 01.11.2008, p. 6672-6680.

Research output: Contribution to journalArticle

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T1 - Pt, PtCo and PtNi electrocatalysts prepared by mechanical alloying for the oxygen reduction reaction in 0.5 M H2SO4

AU - García-Contreras, M. A.

AU - Fernández-Valverde, S. M.

AU - Vargas-García, J. R.

AU - Cortés-Jácome, M. A.

AU - Toledo-Antonio, J. A.

AU - Ángeles-Chavez, C.

PY - 2008/11/1

Y1 - 2008/11/1

N2 - Electrocatalysts of Pt, PtCo and PtNi powders for the oxygen reduction reaction (ORR) were processed by Mechanical Alloying. Physical characterization was made by X-ray diffraction, scanning electron microscopy and scanning transmission electron microscopy. It was found that milled powders formed agglomerates in the range of 0.2-20 μm formed by nanometric size crystallites. The synthesized powders were alloys of PtFe, PtCoFe and PtNiFe due to iron incorporation during the milling process. The binding energies of Pt in the alloys were determined by XPS. Polarization curves were obtained by Rotating Disk Electrode technique in 0.5 M H2SO4 to determine the electrocatalytic activity of the mechanically alloyed powders. Tafel curves were plotted and kinetic parameters for the ORR were calculated. The PtFe alloy showed the highest electrocatalytic activity for the ORR. However, the lowest overpotential was found for the PtCoFe alloy and it also showed a higher current exchange density. A linear relationship was found between the Pt-binding energy in the alloys and the overpotential at the same current density independent of the Pt alloy composition. © 2008 International Association for Hydrogen Energy.

AB - Electrocatalysts of Pt, PtCo and PtNi powders for the oxygen reduction reaction (ORR) were processed by Mechanical Alloying. Physical characterization was made by X-ray diffraction, scanning electron microscopy and scanning transmission electron microscopy. It was found that milled powders formed agglomerates in the range of 0.2-20 μm formed by nanometric size crystallites. The synthesized powders were alloys of PtFe, PtCoFe and PtNiFe due to iron incorporation during the milling process. The binding energies of Pt in the alloys were determined by XPS. Polarization curves were obtained by Rotating Disk Electrode technique in 0.5 M H2SO4 to determine the electrocatalytic activity of the mechanically alloyed powders. Tafel curves were plotted and kinetic parameters for the ORR were calculated. The PtFe alloy showed the highest electrocatalytic activity for the ORR. However, the lowest overpotential was found for the PtCoFe alloy and it also showed a higher current exchange density. A linear relationship was found between the Pt-binding energy in the alloys and the overpotential at the same current density independent of the Pt alloy composition. © 2008 International Association for Hydrogen Energy.

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