Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 17, Issue 23, Pages 15146-15155Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp00692a
Keywords
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Funding
- Department of Science and Technology (DST), India [SR/S1/PC-68/2012]
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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.
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