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Pt-Al and Pt-Y-Al thin film electrodes on yttria-stabilised zirconiaelectrolytes were prepared by dealloying of co-sputtered Pt-Al or Pt-Y-Alfilms. The selective dissolution of Al from the Pt-alloy compound causes theformation of a highly porous nanowire network with a mean branch thicknessbelow 25 nm and a pore intercept length below 35 nm. The oxygen reductioncapability of the resulting electrodes was analysed in a micro-solid oxide fuelcell setup at elevated temperatures (598-873 K). Here, we demonstrate thatthese nanoporous thin films excel "state-of-the-art" fuel cell electrodes interms of catalytic activity and thermal stability. The nanoporous Pt electrodesexhibit exchange current densities that are up to 13 times higher thanconventional Pt electrodes, measured at 648 K. It is shown that the enhancedcatalytic activity of these Pt electrodes is achieved through the engineeringof the materials d-bands due to the addition of yttrium as ternary constituent.

Pt-based nanowire networks with enhanced oxygen-reduction activity