Search NASA⌕ Search

DOE OSTI · 1287947

Materials Data on H2Os4Pt(CO)15 by Materials Project

Abstract

Os3PtH2(CO)11Os(CO)4 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four Os(CO)4 clusters and four Os3PtH2(CO)11 clusters. In each Os(CO)4 cluster, Os+1.50- is bonded in a rectangular see-saw-like geometry to four C+2.40+ atoms. There are a spread of Os–C bond distances ranging from 1.90–1.95 Å. There are four inequivalent C+2.40+ sites. In the first C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the second C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the third C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the fourth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. There are four inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In each Os3PtH2(CO)11 cluster, there are three inequivalent Os+1.50- sites. In the first Os+1.50- site, Os+1.50- is bonded in a 4-coordinate geometry to three C+2.40+ and one H1+ atom. There are a spread of Os–C bond distances ranging from 1.90–1.92 Å. The Os–H bond length is 1.86 Å. In the second Os+1.50- site, Os+1.50- is bonded in a 4-coordinate geometry to three C+2.40+ and one H1+ atom. There is one shorter (1.90 Å) and two longer (1.91 Å) Os–C bond length. The Os–H bond length is 1.86 Å. In the third Os+1.50- site, Os+1.50- is bonded in a 6-coordinate geometry to one Pt2-, three C+2.40+, and two H1+ atoms. The Os–Pt bond length is 2.76 Å. There is two shorter (1.91 Å) and one longer (1.92 Å) Os–C bond length. There is one shorter (1.81 Å) and one longer (1.82 Å) Os–H bond length. Pt2- is bonded in a distorted water-like geometry to one Os+1.50- and two C+2.40+ atoms. There is one shorter (1.91 Å) and one longer (1.92 Å) Pt–C bond length. There are eleven inequivalent C+2.40+ sites. In the first C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Pt2- and one O2- atom. The C–O bond length is 1.16 Å. In the second C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Pt2- and one O2- atom. The C–O bond length is 1.16 Å. In the third C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the fourth C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the fifth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the sixth C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.17 Å. In the seventh C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the eighth C+2.40+ site, C+2.40+ is bonded in a distorted linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the ninth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the tenth C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. In the eleventh C+2.40+ site, C+2.40+ is bonded in a linear geometry to one Os+1.50- and one O2- atom. The C–O bond length is 1.16 Å. There are two inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a bent 120 degrees geometry to two Os+1.50- atoms. In the second H1+ site, H1+ is bonded in a water-like geometry to two Os+1.50- atoms. There are eleven inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the second O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the third O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the fourth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the seventh O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the eighth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the ninth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the tenth O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom. In the eleventh O2- site, O2- is bonded in a single-bond geometry to one C+2.40+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-29. Materials Data on H2Os4Pt(CO)15 by Materials Project. https://doi.org/10.17188/1287947

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related reports

Cyclic moisture reactivation of calcium sorbents for long duration thermochemical energy storage

The transition to a flexible and reliable energy infrastructure, using electro-thermal energy generation technologies such as geothermal, concentrated solar power, and nuclear, usually demands simultaneous advancement of thermal energy storage (TES) to support on-demand electricity generation and industrial applications while mitigating the inherent intermittency of renewable energy sources and power outages from direct energy generation. Among TES technologies, thermochemical energy storage (TCES) based on calcium looping emerges as a compelling high-power energy storage candidate due to its high reaction enthalpy, compatibility with elevated operating temperatures, and abundance of low-cost materials. However, the long-term durability of calcium-based sorbents for TCES is hindered by surface sintering and particle aggregation, leading to performance degradation over repeated thermal cycles. This study explores a moisture hydration-based strategy to regenerate a degraded calcium sorbent and mitigate performance degradation for long duration TCES. The addition of moisture transforms calcium oxide into calcium hydroxide and produces intercalation water layers, associated with a regenerated surface area and reduced calcium oxide crystallite size. Both these effects are beneficial in restoring the sorbents' reactivity for carbonization. Additionally, an optimized hydration-assisted reactivation protocol balances the recovered energy storage capacity with heating penalty required for moisture removal from hydrated samples, resulting in an enhanced energy storage capacity up to 176% compared to benchmark sorbents that undergo cycling without reactivation after 60 cycles. In conclusion, these results highlight the potential of hydration-assisted reactivation to enhance the long-term performance of TCES, providing an effective pathway to advancing electro-thermal storage technologies.

36 MATERIALS SCIENCE↗