Abstract
A Pt/Au/C core-shell catalyst was developed for oxygen reduction reaction by using a surfactant-free chemical reduction and a subsequent electroless redox-transmetalation method. A full coverage of the Au core (∼30nm) by the Pt nanoparticles (∼5nm) was achieved after 48h of redox-transmetalation time which was confirmed by UV-Vis, TEM and electrochemical measurements. The electrocatalytic activity of the as-prepared Pt/Au/C towards ORR was studied in 1M H2SO4 by means of rotating disk electrode investigations. The Pt+Au mass-normalized activity of Pt/Au/C was found to be 2 times higher than that measured at Pt/C. In the high current densities region, however, a Tafel slope of 143mV was calculated for Pt/Au/C_48h, compared to 120mV for Pt/C. The novel catalyst showed a higher methanol tolerance and improved stability compared to the Pt/C reference one.
Published Version
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