Abstract
In the present work, Ru-Se-Fe and Ru-Mo-Fe alloyed nanoparticles were synthesized from high purity powders (Ru, Se and Mo) by means of the high-energy mechanical alloying. Fe was integrated to the alloys because of the erosion of the mill balls. The ORR electrocatalytic performance of the alloys (lixiviated or not) was evaluated in a rotating disc electrode (RDE) at room temperature. X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used for the structure characterization of the materials. Small-particle clusters with granular morphology and nanometric sizes were obtained in all the cases. According to the Tafel parameters from the RDE results, a first order ORR is present in both electrocatalytic systems through a 4e- global multielectron transference to form water: O2 + 4H+ + e- → H2O. The electrocatalytic activity showed that the mechanical alloying enabled to obtain nanoparticle electrocatalysts with good ORR performance. Lixiviation of the mechanical alloying powders not improves the catalytical responses.
Original language | English |
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Pages (from-to) | 429-431 |
Number of pages | 3 |
Journal | Journal of Alloys and Compounds |
Volume | 483 |
Issue number | 1-2 |
DOIs | |
State | Published - 26 Aug 2009 |
Keywords
- Cathode
- Electrocatalysis
- Mechanical alloying
- Oxygen reduction reaction
- PEMFC