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|Title:||The role of surface oxygenated-species and adsorbed hydrogen in the oxygen reduction reaction (ORR) mechanism and product selectivity on Pd-based catalysts in acid media|
|Keywords:||Crystal Microbalance Analysis|
|Publisher:||ROYAL SOC CHEMISTRY|
|Citation:||PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17(23)15146-15155|
|Abstract:||Oxygen reduction reaction (ORR) is investigated on bulk PdO-based catalysts (oxides of Pd and Pd3Co) in oxygen-saturated 0.1 M HClO4 to establish the role of surface oxides and adsorbed hydrogen in the activity and product selectivity (H2O/H2O2). The initial voltammetric features suggest that the oxides are inactive toward ORR. The evolution of the ORR voltammograms and potential-dependent H2O2 generation features on the PdO catalyst suggest gradual and parallel in situ reduction of the bulk PdO phase below similar to 0.4 V in the hydrogen underpotential deposition (H-upd) region; the reduction of the bulk PdO catalyst is confirmed from the X-ray photoelectron spectra (XPS) and X-ray diffraction (XRD) patterns. The potential-dependent H2O2 generation features originate due to the presence of surface oxides and adsorbed hydrogen; this is further confirmed using halide ions (Cl- and Br-) and peroxide as the external impurities.|
|Appears in Collections:||Article|
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