Oxygen evolution on well-characterized mass-selected Ru and RuO2 nanoparticles. Issue 1 (2nd October 2014)

• Record Type: Journal Article
• Authors: Paoli, Elisa A.; Masini, Federico; Frydendal, Rasmus; Deiana, Davide; Schlaup, Christian; Malizia, Mauro; Hansen, Thomas W.; Horch, Sebastian; Stephens, Ifan E. L.; Chorkendorff, Ib
• Is Part Of: Chemical science. Volume 6:Issue 1(2015:Jan.)
• Page Start: 190
• Page End: 196
• Publication Date: 2014-10-02
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c4sc02685c
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Well-defined mass-selected Ru and RuO2 nanoparticles exhibit an order of magnitude improvement in the oxygen evolution activity, relative to the state-of-the-art, with a maximum at around 3–5 nm. Abstract : Oxygen evolution was investigated on model, mass-selected RuO2 nanoparticles in acid, prepared by magnetron sputtering. Our investigations include electrochemical measurements, electron microscopy, scanning tunneling microscopy and X-ray photoelectron spectroscopy. We show that the stability and activity of nanoparticulate RuO2 is highly sensitive to its surface pretreatment. At 0.25 V overpotential, the catalysts show a mass activity of up to 0.6 A mg −1 and a turnover frequency of 0.65 s −1, one order of magnitude higher than the current state-of-the-art.