Pt-Decorated TiO2 Materials Supported on Carbon : Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading

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http://hdl.handle.net/10138/321548

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Barbosa , E C M , Parreira , L S , de Freitas , I C , Aveiro , L R , de Oliveira , D C , dos Santos , M C & Camargo , P H C 2019 , ' Pt-Decorated TiO2 Materials Supported on Carbon : Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading ' , Acs applied energy materials , vol. 2 , no. 8 , pp. 5759-5768 . https://doi.org/10.1021/acsaem.9b00879

Title: Pt-Decorated TiO2 Materials Supported on Carbon : Increasing Activities and Stabilities toward the ORR by Tuning the Pt Loading
Author: Barbosa, Eduardo C. M.; Parreira, Luanna S.; de Freitas, Isabel C.; Aveiro, Luci R.; de Oliveira, Daniela C.; dos Santos, Mauro C.; Camargo, Pedro H. C.
Contributor: University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
Date: 2019-08
Language: eng
Number of pages: 19
Belongs to series: Acs applied energy materials
ISSN: 2574-0962
URI: http://hdl.handle.net/10138/321548
Abstract: Pt nanoparticles (Pt NPs) supported on carbon have been widely employed as electrocatalysts toward oxygen reduction reaction. The development of more efficient electrocatalysts that enable one to reduce or even not require the use of Pt is a central challenge. In addition to the control over the physical and chemical features of Pt NPs, metal support interactions can be employed to enhance activities via the generation and exposure of surface-active sites. In this context, we report herein the development of electrocatalysts composed of Pt NPs supported on TiO2 microspheres, that were subsequently impregnated onto carbon. We have found that, by optimizing the loading of Pt at the TiO2 surface, the electrocatalytic activity toward the ORR could be improved compared to that of the commercial Pt/C (E-TEK) material, even at lower Pt loadings. The enhancement in activities could be assigned to the balance between Pt loading and generation of reactive surface sites, such as adsorbed oxygenated species. Moreover, the utilization of TiO2 as support enabled improved stabilities relative to Pt/C (E-TEK). We believe that the results described herein may inspire the development of electrocatalysts for the ORR with improved activities and stabilities.
Subject: oxygen reduction reaction
electrocatalysis
Pt nanoparticles
TiO2
metal-support interactions
controlled synthesis
OXYGEN REDUCTION REACTION
ROTATING-DISK ELECTRODE
GRAPHENE OXIDE
ELECTROCATALYSTS
PERFORMANCE
PLATINUM
NANOPARTICLES
CATALYSTS
ELECTROGENERATION
NANOCOMPOSITE
116 Chemical sciences
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