Bifunctional amorphous alloys more tolerant to carbon monoxide

Amorphous Ni59Nb40Pt(1−x)Yx (Y=Sn, Ru; x=0%, 0.4%) modified carbon paste electrodes and their role in the electrochemical methanol deprotonation and CO oxidation process

“…It is noteworthy the disappearance of the common pre-peak, already observed for saturated adlayers at low adsorption potentials on polycrystalline Pt [11][12][13] and on monocrystalline Pt(h k l) [14]. This can be indicative of the selectivity of these three MCPEs towards CO ads ; a unique CO-type could be adsorbed on the surface, contrary to what was observed for other groups for Pt(h k l) [15], and in amorphous Ni 59 Nb 40 Pt (1Àx) Y x ribbons [16].…”

Co‐catalytic effect of Rh and Ru for the ethanol electro‐oxidation in amorphous microparticulated alloys

“…Previous studies [5] showed a CO oxidation peak at 0.55 V when Ni 59 Nb 40 Pt 1 catalyst is used. The addition of co-catalysts improves the catalytic behaviour in CO electro-oxidation.…”

“…(3) The removal of CO formed during ethanol electrooxidation, requires the presence of OH species on the electrode surface. Water molecules dissociation to form these species can occur on both platinum (4) and ruthenium sites (5), however in the case of ruthenium, it take place at lower potentials. After that, CO formed during previous steps can be oxidized to CO 2 by interaction with OH species formed on Pt sites (6) …”

“…Previous studies showed that PtRu combination improves the kinetics of CO oxidation in comparison to platinum as single catalytic metal, due to a bi-functional mechanism [3][4][5]. Ruthenium is able to provide OH species at a lower potential than for the case of platinum, with a significant reduction of the poisoning when this metal is present.…”

Ethanol Electro-oxidation on Pt/C Electrocatalysts: An “In Situ” Raman Spectroelectrochemical Study

“…The superficially adsorbed intermediate species of organic molecular oxidation processes have usually been identified by surface analytical techniques such as "in situ" IR spectroscopy [10][11][12][13], sum frequency generation [14], differential electrochemical mass spectrometry [15][16][17], ellipsometry [18], and others. The main limitation of these techniques lies in the high quality requirements of the surface in order to get reliable spectral data.…”