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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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At least 163 records · Page 9
All sourcesNASA NTRSDOE OSTI
DOE OSTI2016

Effect of Multiple Cation Electrolyte Mixtures on Rechargeable Zn–MnO 2 Alkaline Battery

A Bi 2 O 3 in β-MnO 2 composite cathode material has been synthesized using a simple hydrothermal method and cycled in a mixed KOH–LiOH electrolyte with a range of concentrations. We show that, at a KOH:LiOH molar ratio of 1:3, both proton insertion and lithium insertion occur, allowing access to a higher fraction of the theoretical capacity of the MnO 2 while preventing the formation of ZnMn 2 O 4 . This enables a capacity of 360 mAh/g for over 60 cycles, with cycling limited more by anode properties than traditional cathodic failure mechanisms. The structural changes occurring during cycling are characterized using electron microscopy and in situ synchrotron energy-dispersive X-ray diffraction (EDXRD) techniques. This mixed electrolyte shows exceptional cyclability and capacity and can be used as a drop-in replacement for current alkaline batteries, potentially drastically improving their cycle life and creating a wide range of new applications for this energy storage technology.

36 MATERIALS SCIENCE↗
DOE OSTI2021

Canting of the Magnetic Moments on the Octahedral Site of an Iron Oxide Garnet in Response to Diamagnetic Cation Substitution

Using neutron powder diffraction and magnetic susceptibility measurements, we report on the preparation and characterization of the temperature- and field-dependent properties of CaY2ZrFe4O12, a composition closely related to the high-temperature ferrimagnet Y3Fe5O12. By diluting the concentration of paramagnetic ions on the octahedral sublattice of the garnet structure, we find temperature-dependent canting of the magnetic moments. This reflects the importance of the octahedral sublattice in mediating the magnetic interactions between the tetrahedral sites and offers insight into a large number of competing magnetic interactions in the garnet structure.

Milam-Guerrero, JoAnna↗
DOE OSTI2019

Dependence on the Initial Configuration of Strong Field-Driven Isomerization of C 2 H 2 Cations and Anions

In this work, we have investigated the femtosecond laser-induced fragmentation of $C_{2}H_{2}^{q}$ ion beam targets in various initial configurations, including acetylene (linear HCCH), vinylidene (H 2 CC), and cis/trans. The initial configuration is shown to have a tremendous impact on the branching ratio of acetylene-like (CH q1 + CH q2 ) and vinylidene-like ($CH^{q'_{1}}$ + $CH^{q'_{2}}_{2}$) dissociation of a specific $C_{2}H_{2}^{q}$ molecular ion. In particular, whereas $C_{2}H_{2}^{+}$ monocation generated from C 2 H 2 , a linear HCCH target, exhibits comparable levels of acetylene-like and vinylidene-like fragmentation, vinylidene or cis/trans configuration ion beams preferably undergo vinylidene-like fragmentation, with an acetylene branching ratio ranging from 13.9% to zero.

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CH↗