Pt/C doped by MoOx as the electrocatalyst for oxygen reduction and methanol oxidation

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

“…The peak, which is observed at about 0.4 V (Fig. 4; A, curve b), is in agreement with earlier reports describing redox processes involving Mo(V) and Mo (VI) [40,[58][59][60][61]. Moreover, the presence of MoO 3 leads to an increase in the voltammetric peaks for hydrogen adsorption and desorption, which are presumably due to the hydrogen spillover effect within the hydrogen molybdenum bronze.…”

Electrocatalytic Activity and Stability of Platinum Nanoparticles Supported on Carbon–Molybdenum Oxides for the Oxygen Reduction Reaction

“…Clear and welldefined voltammetric profiles of the MoO x -C materials were observed ( Figure S4), that were in accordance with the well-established MoO x profiles reported in the literature. [12][13][14][24][25][26][27][28][29] For the Pt-containing materials, the cyclic voltammograms ( Figure 3a nd Figure S4) exhibit the typical hydrogen adsorption-desorption features of aP ts urface at 0.05-0.40 V( H UPD ), followed by the double-layer( 0.40-0.80 V) and the Pt oxide regions (0.80-1.2 V). The electrochemically active surfacea reas (ECSAs) of the electrodes were obtainedf rom the chargei nvolved in the Pt-H ads desorption process (Supporting Information), and the values are presented in Ta ble 3f or all catalysts.…”

“…Elezović et al [12,13] ascribed this increase in the catalytic properties to synergic effectst hat take place at the Pt-MoO 3 interface, which facilitatet he removal of oxygenated intermediate speciesf rom the Pt surface, thereby increasing the ORR rate. However,this effect cannot be related to the electronic properties of Pt, as these are the same for all catalysts, as demonstrated by the in situ XANESresults.…”

“…This effect was attributedt ot he strong metalsupport interaction existingb etween Pt and Ws pecies, which involves the spillover of primary oxides from the WO x to Pt, facilitating CO 2 formation.I na nother study,Çakar and co-authors showedt hat the dispersion of Pt NPs on MoO x resultsi n al argers urface area and an increase of catalytic activity towards the ORR. [11] Likewise, Elezović et al [12,13] found that the increaseo fc atalytic activity of ORR electrocatalysts based on Pt/C doped with MoO x can be explained by ag reater number of ORRa ctive sites or by synergic effects ascribed to the PtMoO x interface. Furthermore, Yane tal.…”

“…Although the effect of MoO x on Pt/C has been analyzed in many studies, [11][12][13][14] the specific contributiono fd ifferent molybdenum oxideso nt he catalytic activity ands tability of Pt NPs is not well established. Moreover,s tudies on the mechanisms by which the nanoparticles( supported on these oxides)a re degraded are still missing.…”