Search NASA⌕ Search

DOE OSTI · 1291450

Materials Data on H9CN5Cl2 by Materials Project

Abstract

(CN5H9Cl)2Cl2 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of four hydrochloric acid molecules and four CN5H9Cl clusters. In each CN5H9Cl cluster, C4+ is bonded in a trigonal planar geometry to three N+2.20- atoms. There are a spread of C–N bond distances ranging from 1.32–1.37 Å. There are five inequivalent N+2.20- sites. In the first N+2.20- site, N+2.20- is bonded in a trigonal planar geometry to one C4+ and two H1+ atoms. There is one shorter (1.02 Å) and one longer (1.03 Å) N–H bond length. In the second N+2.20- site, N+2.20- is bonded in a trigonal non-coplanar geometry to one N+2.20- and three H1+ atoms. The N–N bond length is 1.43 Å. There is one shorter (1.05 Å) and two longer (1.06 Å) N–H bond length. In the third N+2.20- site, N+2.20- is bonded in a water-like geometry to one N+2.20- and two H1+ atoms. The N–N bond length is 1.40 Å. Both N–H bond lengths are 1.03 Å. In the fourth N+2.20- site, N+2.20- is bonded in a 2-coordinate geometry to one C4+, one N+2.20-, and one H1+ atom. The N–H bond length is 1.05 Å. In the fifth N+2.20- site, N+2.20- is bonded in a 3-coordinate geometry to one C4+, one N+2.20-, and one H1+ atom. The N–H bond length is 1.03 Å. There are nine inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. In the sixth H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- and one Cl1- atom. The H–Cl bond length is 2.07 Å. In the seventh H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. In the eighth H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. In the ninth H1+ site, H1+ is bonded in a single-bond geometry to one N+2.20- atom. Cl1- is bonded in a distorted single-bond geometry to one H1+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-05-01. Materials Data on H9CN5Cl2 by Materials Project. https://doi.org/10.17188/1291450

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↗