Search NASA⌕ Search

DOE OSTI · 1720645

Materials Data on CdRe2C6(N6O7)2 by Materials Project

Abstract

Re2CdC6(N6O7)2 crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of one Re2CdC6(N6O7)2 sheet oriented in the (-1, 0, 2) direction. Re7+ is bonded in a tetrahedral geometry to four O2- atoms. There are a spread of Re–O bond distances ranging from 1.75–1.77 Å. Cd2+ is bonded in an octahedral geometry to six O2- atoms. There are a spread of Cd–O bond distances ranging from 2.26–2.36 Å. There are three inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a 1-coordinate geometry to two N1- and one O2- atom. There is one shorter (1.37 Å) and one longer (1.38 Å) C–N bond length. The C–O bond length is 1.22 Å. In the second C4+ site, C4+ is bonded in a 1-coordinate geometry to two N1- and one O2- atom. There is one shorter (1.37 Å) and one longer (1.38 Å) C–N bond length. The C–O bond length is 1.21 Å. In the third C4+ site, C4+ is bonded in a 1-coordinate geometry to two N1- and one O2- atom. There is one shorter (1.36 Å) and one longer (1.38 Å) C–N bond length. The C–O bond length is 1.23 Å. There are six inequivalent N1- sites. In the first N1- site, N1- is bonded in a 1-coordinate geometry to one C4+ and one N1- atom. The N–N bond length is 1.33 Å. In the second N1- site, N1- is bonded in a 1-coordinate geometry to one C4+ and one N1- atom. The N–N bond length is 1.33 Å. In the third N1- site, N1- is bonded in a 1-coordinate geometry to one C4+, one N1-, and one O2- atom. The N–N bond length is 1.34 Å. The N–O bond length is 2.60 Å. In the fourth N1- site, N1- is bonded in a 1-coordinate geometry to one C4+ and one N1- atom. In the fifth N1- site, N1- is bonded in a distorted single-bond geometry to one C4+ and one N1- atom. In the sixth N1- site, N1- is bonded in a 1-coordinate geometry to one C4+, one N1-, and one O2- atom. The N–O bond length is 2.96 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Re7+ and one N1- atom. In the third O2- site, O2- is bonded in a bent 120 degrees geometry to one Cd2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cd2+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a single-bond geometry to one Re7+ and one N1- atom. In the sixth O2- site, O2- is bonded in a single-bond geometry to one Re7+ atom. In the seventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Cd2+ and one C4+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-04-29. Materials Data on CdRe2C6(N6O7)2 by Materials Project. https://doi.org/10.17188/1720645

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↗