Search NASA⌕ Search

SEARCH · Search NASA

Results for “Co-Ho”

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.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

6 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Elimination of NO Pollutant in Semi-enclosed Spaces over Sodium-promoted Cobalt Oxyhydroxide (CoOOH) by Oxidation and Adsorption Mechanism

Low concentrations of NOx accumulated in air in semi-enclosed spaces is a severe health hazard, but its efficient removal at low cost is a grand challenge. A simple method in preparing CoOOH for low-concentration NO removal at room temperature is described here. The samples are synthesized by oxidizing Co(OH)2 to CoOOH with different oxidants (Na2S2O8, O2 and H2O2). Among them, CoOOH prepared by Na2S2O8 (Co-NS) shows remarkable performance for NO abatement, while the samples synthesized by and H2O2 (Co-HO) and O2 (Co-OG) have no apparent NO removal capacity. It is found that the Co-NS material contains a higher concentration of residual Na, which contributes to the decreased crystallinity and increased concentrations of surface active species (Co2+, active oxygen) for NO storage. Following NO storage, the material can be readily regenerated by water washing. The authors from East China University of Science and Technology acknowledge support from National Basic Research Program of China (2013CB933200), National Natural Science Foundation of China (21577035, 21577034), Commission of Science and Technology of Shanghai Municipality (15DZ1205305) and 111 Project (B08021). Aiyong Wang acknowledges the China Scholarship Council for the Joint-Training Scholarship Program with the Pacific Northwest National Laboratory (PNNL). PNNL is operated by Battelle for the US DOE under contract DE-AC05-76RL01830. FG is supported by the U.S. DOE/Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office.

NOx abatement, NOx adsorber, ambient temperature, ↗
DOE OSTI2020

Materials Data on Ho2Co17 by Materials Project

Ho2Co17 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 12-coordinate geometry to eighteen Co atoms. There are a spread of Ho–Co bond distances ranging from 2.93–3.25 Å. In the second Ho site, Ho is bonded in a 2-coordinate geometry to twenty Co atoms. There are a spread of Ho–Co bond distances ranging from 2.88–3.13 Å. There are four inequivalent Co sites. In the first Co site, Co is bonded in a 2-coordinate geometry to one Ho and thirteen Co atoms. There are a spread of Co–Co bond distances ranging from 2.32–2.67 Å. In the second Co site, Co is bonded to two equivalent Ho and ten Co atoms to form CoHo2Co10 cuboctahedra that share corners with fourteen CoHo2Co10 cuboctahedra, edges with six equivalent CoHo3Co9 cuboctahedra, and faces with ten CoHo2Co10 cuboctahedra. There are four shorter (2.39 Å) and four longer (2.40 Å) Co–Co bond lengths. In the third Co site, Co is bonded in a 12-coordinate geometry to two Ho and ten Co atoms. There are a spread of Co–Co bond distances ranging from 2.34–2.54 Å. In the fourth Co site, Co is bonded to three Ho and nine Co atoms to form a mixture of distorted face, edge, and corner-sharing CoHo3Co9 cuboctahedra. Both Co–Co bond lengths are 2.41 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoCo2 by Materials Project

HoCo2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. Ho is bonded in a 12-coordinate geometry to twelve equivalent Co atoms. All Ho–Co bond lengths are 2.97 Å. Co is bonded to six equivalent Ho and six equivalent Co atoms to form a mixture of face, edge, and corner-sharing CoHo6Co6 cuboctahedra. All Co–Co bond lengths are 2.53 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoCo5 by Materials Project

HoCo5 crystallizes in the hexagonal P6/mmm space group. The structure is three-dimensional. Ho is bonded in a 6-coordinate geometry to eighteen Co atoms. There are six shorter (2.83 Å) and twelve longer (3.15 Å) Ho–Co bond lengths. There are two inequivalent Co sites. In the first Co site, Co is bonded in a 12-coordinate geometry to three equivalent Ho and six equivalent Co atoms. All Co–Co bond lengths are 2.43 Å. In the second Co site, Co is bonded to four equivalent Ho and eight Co atoms to form a mixture of corner, edge, and face-sharing CoHo4Co8 cuboctahedra. All Co–Co bond lengths are 2.45 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on HoCo3 by Materials Project

HoCo3 crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a distorted hexagonal planar geometry to eighteen Co atoms. There are six shorter (2.86 Å) and twelve longer (3.17 Å) Ho–Co bond lengths. In the second Ho site, Ho is bonded in a 12-coordinate geometry to twelve Co atoms. There are a spread of Ho–Co bond distances ranging from 2.86–3.08 Å. There are three inequivalent Co sites. In the first Co site, Co is bonded to six equivalent Ho and six equivalent Co atoms to form CoHo6Co6 cuboctahedra that share corners with twelve equivalent CoHo5Co7 cuboctahedra, edges with six equivalent CoHo6Co6 cuboctahedra, and faces with eighteen equivalent CoHo5Co7 cuboctahedra. All Co–Co bond lengths are 2.53 Å. In the second Co site, Co is bonded in a 12-coordinate geometry to three equivalent Ho and six equivalent Co atoms. There are three shorter (2.42 Å) and three longer (2.47 Å) Co–Co bond lengths. In the third Co site, Co is bonded to five Ho and seven Co atoms to form CoHo5Co7 cuboctahedra that share corners with seventeen CoHo6Co6 cuboctahedra, edges with eight equivalent CoHo5Co7 cuboctahedra, and faces with fourteen CoHo6Co6 cuboctahedra. There are two shorter (2.46 Å) and two longer (2.50 Å) Co–Co bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3Co by Materials Project

Ho3Co is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is two-dimensional and consists of two Ho3Co sheets oriented in the (0, 0, 1) direction. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 2-coordinate geometry to two equivalent Co atoms. There are one shorter (2.73 Å) and one longer (2.82 Å) Ho–Co bond lengths. In the second Ho site, Ho is bonded in a distorted bent 150 degrees geometry to two equivalent Co atoms. There are one shorter (2.67 Å) and one longer (2.75 Å) Ho–Co bond lengths. Co is bonded in a 6-coordinate geometry to six Ho atoms.

36 MATERIALS SCIENCE↗