1. Electroreduction of oxygen on palladium nanoparticles supported on nitrogen-doped graphene nanosheets.
- Author
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Jukk, Kristel, Kongi, Nadezda, Matisen, Leonard, Kallio, Tanja, Kontturi, Kyösti, and Tammeveski, Kaido
- Subjects
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OXYGEN , *PALLADIUM , *ELECTROLYTIC reduction , *NANOPARTICLES , *NITROGEN , *GRAPHENE , *CATALYST supports - Abstract
The electrochemical reduction of oxygen on Pd nanoparticle-decorated nitrogen-doped graphene (Pd/NG) catalyst has been investigated in acid and alkaline solutions using the rotating disk electrode (RDE) method. The Pd/NG nanocomposites were prepared by NaBH4reduction. The surface characterisation of Pd/NG composites was performed by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The TEM images showed the uniform distribution of Pd nanoparticles over the N-doped graphene nanosheets. The RDE results indicated that Pd/NG catalysts possess a high electrocatalytic activity towards the oxygen reduction reaction (ORR). The prepared materials catalyse a 4-electron reduction of oxygen. The Tafel behaviour of O2reduction on Pd/NG catalysts was similar to that of bare Pd. The Pd/NG composite showed excellent ORR performance in alkaline media and is a promising material to be used as a cathode catalyst for alkaline membrane fuel cells. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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