Pt nanoparticles sputter-deposited on TiO2/MWCNT composites prepared by atomic layer deposition: Improved electrocatalytic activity towards the oxygen reduction reaction and durability in acid media |
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| Authors: | Sajid Hussain Heiki Erikson Nadezda Kongi Aivar Tarre Peeter Ritslaid Mihkel Rähn Leonard Matisen Maido Merisalu Väino Sammelselg Kaido Tammeveski |
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| Affiliation: | 1. Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia;2. Institute of Physics, University of Tartu, W. Ostwald Str. 1, 50411 Tartu, Estonia |
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| Abstract: | Acid-treated multi-walled carbon nanotubes (MWCNTs) were decorated with TiO2 using the atomic layer deposition (ALD) technique followed by uniform distribution of platinum nanoparticles (PtNPs) through magnetron sputtering. Surface analyses were performed by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and X-ray photoelectron spectroscopy (XPS). Electrochemical decontamination and characterization of the Pt-TiO2/MWCNT electrodes were carried out by CO stripping followed by cyclic voltammetry in acid media. The oxygen reduction reaction (ORR) was studied in O2-saturated 0.05 M H2SO4 solution using the rotating disk electrode (RDE) method. Durability of the prepared catalysts was examined by repetitive potential cycling. Electrochemical data obtained was analyzed and compared to that of the commercial Pt/C catalyst. It was revealed that the Pt-TiO2/MWCNT catalysts possess higher ORR activity and better durability as compared to that of the commercial Pt/C. |
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| Keywords: | Oxygen reduction Electrocatalysis Pt-based catalyst Titanium dioxide Composite catalyst Atomic layer deposition |
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