Abstract
Pd, PdSe and PdNi electrocatalyst were synthesized through the ball-milling technique and their catalytic activity evaluated for the oxygen reduction reaction (ORR) in acid medium. These compounds were characterized by mean of transmission electron microscopy (TEM) and X ray diffraction (XRD). TEM images showed highly uniform agglomerates of nanometric size particles. Electrochemical studies, for these compounds supported on carbon Vulcan and dispersed in a Nafion film, were achieved through rotating disc electrode (RDE) technique. Kinetics results in all compounds were a first order reaction with four electrons transfer mechanism to water formation. The incorporation of selenium to palladium catalyst produced a decreased in the catalytic activity, while the addition of Ni favored the cathodic reaction, generating the lowest overpotential (0.36V) of all studied materials at 1 mAcm -2.
Original language | English |
---|---|
Pages (from-to) | 63-67 |
Number of pages | 5 |
Journal | Journal of New Materials for Electrochemical Systems |
Volume | 12 |
Issue number | 2-3 |
State | Published - Apr 2009 |
Externally published | Yes |
Keywords
- Mechanical milling
- Oxygen reduction electrocatalysis
- Pd base nanoparticles