MoO2 nanocrystals down to 5 nm as Pt electrocatalyst promoter for stable oxygen reduction reaction

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

“…Long-term cyclingm ight reduce the poisoning effect of the Mo-based layer,l eading to as light increase of the ORR activity (i 0.9V ,T able 4). Thisr esult is in agreement with that of Yan et al, [14] who observed that as imilarP t/MoO 2 -C material exhibits higher catalytic stability compared to Pt/C. This effect was attributed to as tronger interaction between Pt and MoO x species, compared to Pt and C, as also seen from the XPS results (Table S2).…”

“…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.…”

“…Furthermore, Yane tal. [14] compared the catalytic performanceo fP t/C-MoO 2 and Pt/C for the ORR in acidic media. X-ray photoelectrons pectroscopy (XPS)s howed that the Pt-MoO 2 interaction is stronger than the Pt-C interaction.…”

“…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.…”

Electrochemical performance of lithium molybdenum composite catalyst in oxygen reduction reaction

“…Recently studies, molybdenum oxides are highly popular because of their unique electronic and molecular structures in many catalytic applications [30]. This can be attributed to the non-stoichiometric lower valence compositions between MoO 2 and MoO 3 simply given as MoOx [16,31].…”