Topic
Oxygen
About: Oxygen is a research topic. Over the lifetime, 48149 publications have been published within this topic receiving 1113788 citations. The topic is also known as: O & Oxygen.
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TL;DR: In this paper, the surface exchange kinetics in limiting the rate of oxygen permeation through mixed-conducting oxide ceramics are investigated. But the authors focus on the perovskite type oxides.
448 citations
TL;DR: In this article, a stable, cation-ordered oxides with layered lattice structures were obtained with medium-sized Ln 3+ ions over a wide range of oxygen partial pressures, a property essential for applications as oxygen separation membranes and solid oxide fuel cell cathodes.
446 citations
TL;DR: In this article, the titration by means of hydrogen or deuterium at 100 °C of oxygen preadsorbed on a supported palladium catalyst has been used to measure the dispersion of the palladium.
445 citations
TL;DR: The results give strong support to the previously proposed mechanism that the oxygen photoevolution is initiated by a nucleophilic attack of a H2O molecule on a photogenerated hole at a surface lattice O site, not by oxidation of surface OH group by the hole.
Abstract: Primary intermediates of oxygen photoevolution (water photooxidation) reaction at the TiO2 (rutile)/aqueous solution interface were investigated by in situ multiple internal reflection infrared (MIRIR) absorption and photoluminescence (PL) measurements. UV irradiation of TiO2 in the presence of 10 mM Fe3+ in the solution caused the appearance of a new peak at 838 cm-1 and a shoulder at 812 cm-1. Detailed investigations of the effects of solution pH, the presence of methanol as a hole scavenger, and isotope exchange in water (H216O→H218O) on the spectra have shown that the 838- and 812-cm-1 bands can be assigned to the O−O stretching mode of surface TiOOH and TiOOTi, respectively, produced as primary intermediates of the oxygen photoevolution reaction. The results give strong support to our previously proposed mechanism that the oxygen photoevolution is initiated by a nucleophilic attack of a H2O molecule on a photogenerated hole at a surface lattice O site, not by oxidation of surface OH group by the hole...
445 citations
TL;DR: This study studies the selectivity of a functional model of cytochrome c oxidase's active site that mimics the coordination environment and relative locations of Fea3, CuB, and Tyr244 to support the hypothesis that, during steady-state turnover, the primary role of these redox centers is to rapidly provide all the electrons needed to reduce oxygen by four electrons.
Abstract: We studied the selectivity of a functional model of cytochrome c oxidase's active site that mimics the coordination environment and relative locations of Fea3, CuB, and Tyr244. To control electron flux, we covalently attached this model and analogs lacking copper and phenol onto self-assembled monolayer–coated gold electrodes. When the electron transfer rate was made rate limiting, both copper and phenol were required to enhance selective reduction of oxygen to water. This finding supports the hypothesis that, during steady-state turnover, the primary role of these redox centers is to rapidly provide all the electrons needed to reduce oxygen by four electrons, thus preventing the release of toxic partially reduced oxygen species.
445 citations