Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/18003
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
Authors: RAHUL, R
SINGH, RK
BERA, B
DEVIVARAPRASAD, R
NEERGAT, M
Keywords: Crystal Microbalance Analysis
Electrochemical-Behavior
Polycrystalline Platinum
Perfluorinated Ionomer
Palladium Electrode
Peroxide Generation
Sorption Properties
Single-Crystals
Oxide Layers
Fuel-Cells
Issue Date: 2015
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.
URI: http://dx.doi.org/10.1039/c5cp00692a
http://dspace.library.iitb.ac.in/jspui/handle/100/18003
ISSN: 1463-9076
1463-9084
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