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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Fe 3 O 4 /ZrO 2 Composite as a Robust Chemical Looping Oxygen Carrier: A Kinetics Study on the Reduction Process
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How Hydrogen and Oxygen Vapor Affect the Tribochemistry of Silicon- and Oxygen-Containing Hydrogenated Amorphous Carbon under Low-Friction Conditions: A Study Combining X-ray Absorption Spectromicroscopy and Data Science Methods
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Tuning Metal Elements in Open Frameworks for Efficient Oxygen Evolution and Oxygen Reduction Reaction Catalysts
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Quasi-Two-Dimensional Earth-Abundant Bimetallic Electrocatalysts for Oxygen Evolution Reactions
The extremely large surface area offered by quasi-two-dimensional (2D) nanostructures is a great advantage for catalytic applications. While bimetallic materials have been discovered as a group of promising catalysts for electrochemical water splitting, a facile and reliable synthesis approach toward 2D morphology to fully release its electrochemical catalytic potential is still lacking. In this work, bimetallic Co–Mo–O ultrathin nanosheets were synthesized by ionic layer epitaxy with controlled composition ratio. The Co–Mo–O nanosheets exhibited a quadrangle shape with a uniform thickness of ~2.5 nm. This 2D morphology largely enriched the surface catalytic active site ratio. Particularly, nanosheets with 2:1 Co-to-Mo ratio showed a substantially enhanced OER catalytic activity with a 3 orders of magnitude higher mass activity compared to benchmark IrO 2 and RuO 2 in an alkaline environment. Furthermore, this study introduces a promising possibility for creating high-performance electrocatalysts from 2D bimetallic materials with a high efficiency for material utilization.
In Situ X-ray Absorption Spectroscopy of PtNi-Nanowire/Vulcan XC-72R under Oxygen Reduction Reaction in Alkaline Media
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Nanostructure Transformation as a Signature of Oxygen Redox in Li-Rich 3d and 4d Cathodes
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Characterization of flame synthesized Pd–TiO 2 nanocomposite catalysts for oxygen removal from CO 2 -rich streams in oxy combustion exhausts
Metallic Pd and/or reduced Pd oxide on Pd–TiO 2 is found to be the intrinsic active site for O 2 removal.
Lewis acidic boron–oxygen interactions activate cobalt oxysulfide for oxygen evolution reaction
Lewis-acidic boron incorporation into amorphous cobalt oxysulfide induces charge redistribution and cooperative OH − adsorption, enabling enhanced OER activity (10 mA cm −2 at 189 mV in 1.0 M KOH) with stable cycling, driven by Fermi-level electronic modulation.
Nonequilibrium calculations of methane fluorine oxygen and butene-1-fluorine oxygen rocket performance
Calculating equilibrium and kinetically limited performance using one dimensional model
Thermal neutral temperature of rats in helium-oxygen, argon-oxygen, and air.
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An investigation of the ionospheric D region at sunrise. I - Time variations of ozone, metastable molecular oxygen, and atomic oxygen. II - Estimation of some photodetachment rates. III - Time variations of negative-ion and electron densities.
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Oxygen isotopic compositions and oxygen concentrations of Apollo 14 and Apollo 15 rocks and soils.
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ASRDI Oxygen Technological Survey: Oxygen Systems Engineering Review - Volume 9
The design and safe operation of O2 systems at high pressures and temperatures are discussed. Data cover O2 reactivity with system materials, environmental limits, flow rate, contamination, and physical and chemical stresses of materials.
Quenching of metastable 2-D oxygen ions in the thermosphere by atomic oxygen
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Kinetics of hydrogen-oxygen and methane-oxygen ignition sensitized by NO or NO2
In a study of methane ignition sensitized by NO2, the induction period chemical kinetics were examined by monitoring reactants and intermediates (CH4, NO2, OH, NO, CO, CO2, and H2O) prior to ignition. Data were obtained at pressure of 2-4 atm, temperatures of 1300-1900 K, equivalence ratios of 0.5-1.0, and NO2 up to 3.4 mole %. A tentative NO2 sensitization mechanism was deduced from the analysis of photometric observations and the comparison of computer modeling with observations.
Charge exchange of metastable 2D oxygen ions with molecular oxygen - A new source of thermospheric O2/+/ ions
Reactions involving metastable ions are difficult to study in the laboratory. Much new information on these reactions has been derived from satellite measurements of aeronomic parameters. In this paper, Atmosphere Explorer D data are used to study charge exchange of metastable O(+)(2D) ions with O2. Using direct measurements of the O2 at 200 km to compute O2 densities at 300 km and supporting ionic concentrations and temperature observations, we find the rate coefficient for this reaction to be 1 + or - 0.6 times 10 to the minus 9th cu cm/sec. The process constitutes a significant source of O2(+) ions in the F2 layer at times when the N2 and O2 densities are enhanced. This finding leads to the conclusion that charge exchange with O2 must be a major sink for O(+)(2D) and an important source of O2(+) ions in the E region, because of the increase in the O2 concentration/N2 concentration ratio with decreasing altitude. The results imply that 80% of all O(+) ions formed in the E region are converted to O2(+) and that only about 20% of the metastable O(+) ions are converted into N2(+) through charge exchange with N2.