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Results for “Ag-Cu-O”

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7 records
All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Shapeshifting Nanocatalyst for CO2 Conversion

The conversion of CO2 into high-value chemicals through a photoreduction reaction in water is a promising route to reduce the dependence on fossil fuels. Enhancing selectivity toward hydrocarbons or alcohols can be achieved by Ag-Cu alloys. However, the stabilized surface state created by Ag-Cu interactions is still poorly understood. In this work, multi-modal in situ X-ray experiments reveals underlying mechanisms and the evolution of Ag-Cu nanoparticles under CO2 reduction reaction (CO2RR) conditions. Both morphological and chemical changes of Ag and Cu species induced by diffusion mechanics are tracked during nanocatalyst operation. The initial spheroid Ag-Cu nanoparticles are composed of a Cu-rich shell and Ag-rich core. The reduction treatment promotes Ag migration toward the surface. During photocatalytic CO2 reduction reaction, Cu atoms migrate back to the surface, forming Ag-Cu-O species. The study observes the surface oxidation of Cu(0) to Cu+ and the presence of Ag at the sub-surface region. Furthermore, nanoparticles change their shape, decreasing their specific surface area, driven by Cu diffusion during the CO2 photoreduction reaction. The results provide invaluable insights into the dynamic restructuring of the catalyst under reaction conditions and into the active species responsible for CO2 conversion.

CO2 reduction reaction↗
DOE OSTI2020

Materials Data on Cu2Ag2O3 by Materials Project

Ag2Cu2O3 crystallizes in the tetragonal I4_1/amd space group. The structure is three-dimensional. Ag1+ is bonded in a linear geometry to two equivalent O2- atoms. Both Ag–O bond lengths are 2.11 Å. Cu2+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.92 Å) and two longer (2.01 Å) Cu–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded to two equivalent Ag1+ and two equivalent Cu2+ atoms to form a mixture of corner and edge-sharing OCu2Ag2 tetrahedra. In the second O2- site, O2- is bonded to four equivalent Cu2+ atoms to form distorted OCu4 tetrahedra that share corners with eight OCu4 tetrahedra and edges with two equivalent OCu2Ag2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CuAgO2 by Materials Project

AgCuO2 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ag1+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. There are a spread of Ag–O bond distances ranging from 2.31–2.52 Å. Cu3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. There is two shorter (1.88 Å) and two longer (1.90 Å) Cu–O bond length. O2- is bonded in a 2-coordinate geometry to three equivalent Ag1+ and two equivalent Cu3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CuAgO2 by Materials Project

AgCuO2 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of two AgCuO2 sheets oriented in the (1, 0, 0) direction. Ag1+ is bonded in a distorted linear geometry to two equivalent O2- atoms. Both Ag–O bond lengths are 2.17 Å. Cu3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cu–O bond lengths are 1.88 Å. O2- is bonded in a distorted trigonal non-coplanar geometry to one Ag1+ and two equivalent Cu3+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on CuAgO2 by Materials Project

AgCuO2 crystallizes in the orthorhombic Pmmm space group. The structure is three-dimensional. Ag1+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Ag–O bond lengths are 2.26 Å. Cu3+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cu–O bond lengths are 1.90 Å. O2- is bonded to two equivalent Ag1+ and two equivalent Cu3+ atoms to form a mixture of distorted edge and corner-sharing OCu2Ag2 tetrahedra.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cu2AgO4 by Materials Project

AgCu2O4 crystallizes in the triclinic P-1 space group. The structure is three-dimensional. Ag3+ is bonded in a square co-planar geometry to four O2- atoms. There are two shorter (2.12 Å) and two longer (2.14 Å) Ag–O bond lengths. There are two inequivalent Cu+2.50+ sites. In the first Cu+2.50+ site, Cu+2.50+ is bonded in a square co-planar geometry to four O2- atoms. All Cu–O bond lengths are 1.87 Å. In the second Cu+2.50+ site, Cu+2.50+ is bonded in a square co-planar geometry to four O2- atoms. There is two shorter (1.84 Å) and two longer (1.85 Å) Cu–O bond length. There are two inequivalent O2- sites. In the first O2- site, O2- is bonded in a trigonal non-coplanar geometry to one Ag3+ and two Cu+2.50+ atoms. In the second O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ag3+ and two Cu+2.50+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Cu(AgO)2 by Materials Project

Cu(AgO)2 crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. Ag1+ is bonded in a 4-coordinate geometry to four equivalent O2- atoms. There are two shorter (2.27 Å) and two longer (2.66 Å) Ag–O bond lengths. Cu2+ is bonded in a square co-planar geometry to four equivalent O2- atoms. All Cu–O bond lengths are 1.97 Å. O2- is bonded to four equivalent Ag1+ and two equivalent Cu2+ atoms to form a mixture of distorted corner and edge-sharing OCu2Ag4 octahedra. The corner-sharing octahedra tilt angles range from 0–10°.

36 MATERIALS SCIENCE↗