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All sourcesNASA NTRSDOE OSTI
NASA NTRS1990

ISS and TPD study of the adsorption and interaction of CO and H2 on polycrystalline Pt

The adsorption and interaction of CO and H2 on polycrystalline Pt has been studied using ion scattering spectroscopy (ISS) and temperature programmed desorption (TPD). The ISS results indicate that the initial CO adsorption on Pt takes place very rapidly and saturates the Pt surface with coverage close to a monolayer. ISS also shows that the CO molecules adsorb at an angular orientation from the surface normal and perhaps parallel to the surface. A TPD spectrum obtained after coadsorbing C-12 O-16 and C-13 O-18 on Pt shows no isotopic mixing, which is indicative of molecular CO adsorption. TPD spectra obtained after coadsorbing H2 and CO on polycrystalline Pt provides evidence for the formation of a CO-H surface species.

Melendez, Orlando↗
DOE OSTI2020

Materials Data on Co3H by Materials Project

Co3H is H-Phase-derived structured and crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. there are two inequivalent Co sites. In the first Co site, Co is bonded in a 3-coordinate geometry to three equivalent Co and three equivalent H atoms. All Co–Co bond lengths are 2.47 Å. All Co–H bond lengths are 1.83 Å. In the second Co site, Co is bonded to twelve Co atoms to form CoCo12 cuboctahedra that share corners with six equivalent CoCo12 cuboctahedra, corners with six equivalent HCo6 octahedra, edges with six equivalent CoCo12 cuboctahedra, edges with six equivalent HCo6 octahedra, and faces with six equivalent CoCo12 cuboctahedra. The corner-sharing octahedral tilt angles are 17°. All Co–Co bond lengths are 2.55 Å. H is bonded to six equivalent Co atoms to form HCo6 octahedra that share corners with six equivalent CoCo12 cuboctahedra, edges with six equivalent CoCo12 cuboctahedra, and edges with six equivalent HCo6 octahedra.

36 MATERIALS SCIENCE↗