Reversible perovskite electrocatalysts for oxygen reduction/oxygen evolution.

The identification of electrocatalysts mediating both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are prerequisite for the development of reversible fuel cells and rechargeable metal-air batteries. The question remains as to whether a bifunctional catalyst, or a single catalyst site, will exhibit potentials converging to +1.23 V.

High-Throughput Synthesis and Characterization of Eu Doped Ba SrSiO Thin Film Phosphors.

High-throughput techniques have been employed for the synthesis and characterization of thin film phosphors of Eu-doped Ba SrSiO. Direct synthesis from evaporation of the constituent elements under a flux of atomic oxygen on a sapphire substrate at 850 °C was used to directly produce thin film libraries (415 nm thickness) of the crystalline orthosilicate phase with the desired compositional variation (0.24 > x > 1.

Synthesis and Screening of Phase Change Chalcogenide Thin Film Materials for Data Storage.

A combinatorial synthetic methodology based on evaporation sources under an ultrahigh vacuum has been used to directly synthesize compositional gradient thin film libraries of the amorphous phases of GeSbTe alloys at room temperature over a wide compositional range. An optical screen is described that allows rapid parallel mapping of the amorphous-to-crystalline phase transition temperature and optical contrast associated with the phase change on such libraries. The results are shown to be consistent with the literature for compositions where published data are available along the SbTe-GeTe tie line.