TY - JOUR
T1 - PdNi electrocatalyst for oxygen reduction in acid media
AU - Ramos-Sánchez, G.
AU - Yee-Madeira, H.
AU - Solorza-Feria, O.
N1 - Funding Information:
This research project was financially supported by the National Science and Technology Council of Mexico, CONACYT, under Grant no. 46094 and ICY TDF (OCF-OSF). One of the authors (G.R.S.) would like to thank CONACYT for providing him the doctoral fellowship. The authors thank Carlos Flores for assistance in TEM measurements.
PY - 2008/7
Y1 - 2008/7
N2 - The PdNi nanoparticles dispersed on Nafion solution was used as an ink-type electrode for oxygen reduction reaction (ORR), in acid media. This bimetallic catalyst was synthesized via the metallic reductive precipitations of the chloride precursors with NaBH4 in tetrahydrofuran (THF) at 25 {ring operator} C. The characterization of the electrocatalyst using X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed bimetallic nanoparticles having a narrow size ranged 8 - 10 nm with face-centered cubic (fcc) hexagonal structure. Cyclic voltammograms and polarization curves from rotating-disk electrode measurements showed significantly higher activity on PdNi than observed on Pd catalyst, with a mechanism involving four electrons transfer to water formation. The incorporation of Ni, a less electronegative metal to Pd shifts the onset potential for the ORR approximately 110 mV more positive, and at 0.5 mA cm- 2 the cathode overpotential is reduced by 260 mV in relation to that obtained on Pd, in a 0.5 M H2 SO4 solution at 25 {ring operator} C.
AB - The PdNi nanoparticles dispersed on Nafion solution was used as an ink-type electrode for oxygen reduction reaction (ORR), in acid media. This bimetallic catalyst was synthesized via the metallic reductive precipitations of the chloride precursors with NaBH4 in tetrahydrofuran (THF) at 25 {ring operator} C. The characterization of the electrocatalyst using X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed bimetallic nanoparticles having a narrow size ranged 8 - 10 nm with face-centered cubic (fcc) hexagonal structure. Cyclic voltammograms and polarization curves from rotating-disk electrode measurements showed significantly higher activity on PdNi than observed on Pd catalyst, with a mechanism involving four electrons transfer to water formation. The incorporation of Ni, a less electronegative metal to Pd shifts the onset potential for the ORR approximately 110 mV more positive, and at 0.5 mA cm- 2 the cathode overpotential is reduced by 260 mV in relation to that obtained on Pd, in a 0.5 M H2 SO4 solution at 25 {ring operator} C.
KW - Electrocatalysis
KW - Oxygen reduction reaction
KW - PdNi catalyst
UR - http://www.scopus.com/inward/record.url?scp=47249084703&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2008.03.004
DO - 10.1016/j.ijhydene.2008.03.004
M3 - Artículo
SN - 0360-3199
VL - 33
SP - 3596
EP - 3600
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 13
ER -