TY - JOUR
T1 - Pd and Pd-Co oxygen reduction nanocatalysts in acidic media
AU - Martínez, Adarely Velasco
AU - Rodríguez, Miguel Torres
AU - Arzaluz, Mirella Gutiérrez
AU - Del Angel Vicente, Paz
AU - Feria, Omar Solorza
PY - 2012/8
Y1 - 2012/8
N2 - Palladium (Pd) and palladium-cobalt (Pd-Co) nanocatalysts were successfully synthesized by the chemical reduction method and characterized for the molecular oxygen reduction reaction (ORR) in acid medium. Both Pd and Pd-Co nanoparticles were prepared by the chemical reduction of palladium (II) chloride, PdCl 2, and cobalt (II) chloride, CoCl 2, as precursors and polyvinylpyrrolidine (PVP) as a protecting agent. The synthesized Pd/C and Pd-Co/C materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results conducted to the formation of bimetallic nanoparticles with an average size of 5 to 12 nm and a good dispersion of Pd-Co on carbon, as well as the formation of some nano-sized clusters particles. The crystallographic planes identified as (111) and a (200) corresponds to the formation of face-centered cubic (FCC) Pd with nanocrystalline structure.The nanocatalyst were supported on Vulcan® carbon XC-72 by the impregnation method and their electrochemical activity for the ORR was evaluated by cyclic voltammetry and rotating disk electrode techniques. The obtained results demonstrated that the Pd-based catalysts promoted the activity toward the ORR through a multi-electron charge transfer mechanism for the oxygen reduction to water formation.
AB - Palladium (Pd) and palladium-cobalt (Pd-Co) nanocatalysts were successfully synthesized by the chemical reduction method and characterized for the molecular oxygen reduction reaction (ORR) in acid medium. Both Pd and Pd-Co nanoparticles were prepared by the chemical reduction of palladium (II) chloride, PdCl 2, and cobalt (II) chloride, CoCl 2, as precursors and polyvinylpyrrolidine (PVP) as a protecting agent. The synthesized Pd/C and Pd-Co/C materials were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Results conducted to the formation of bimetallic nanoparticles with an average size of 5 to 12 nm and a good dispersion of Pd-Co on carbon, as well as the formation of some nano-sized clusters particles. The crystallographic planes identified as (111) and a (200) corresponds to the formation of face-centered cubic (FCC) Pd with nanocrystalline structure.The nanocatalyst were supported on Vulcan® carbon XC-72 by the impregnation method and their electrochemical activity for the ORR was evaluated by cyclic voltammetry and rotating disk electrode techniques. The obtained results demonstrated that the Pd-based catalysts promoted the activity toward the ORR through a multi-electron charge transfer mechanism for the oxygen reduction to water formation.
KW - Electrocatalysts
KW - Nanoparticles
KW - Oxygen reduction reaction (ORR)
KW - Pd
KW - Pd-Co
UR - http://www.scopus.com/inward/record.url?scp=84865101637&partnerID=8YFLogxK
M3 - Artículo
AN - SCOPUS:84865101637
SN - 1452-3981
VL - 7
SP - 7140
EP - 7151
JO - International Journal of Electrochemical Science
JF - International Journal of Electrochemical Science
IS - 8
ER -