Search NASA⌕ Search

DOE OSTI · 1285174

Materials Data on Cu2H6C3N4O by Materials Project

Abstract

Cu2(CN)3NH4H2O crystallizes in the monoclinic P2_1/c space group. The structure is two-dimensional and consists of four ammonium molecules; four water molecules; and two Cu2(CN)3 sheets oriented in the (1, 0, 1) direction. In each Cu2(CN)3 sheet, there are two inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded in a distorted trigonal planar geometry to one C2+ and two N3- atoms. The Cu–C bond length is 1.85 Å. There is one shorter (1.91 Å) and one longer (1.96 Å) Cu–N bond length. In the second Cu1+ site, Cu1+ is bonded in a distorted trigonal planar geometry to two C2+ and one N3- atom. Both Cu–C bond lengths are 1.88 Å. The Cu–N bond length is 1.94 Å. There are three inequivalent C2+ sites. In the first C2+ site, C2+ is bonded in a distorted linear geometry to one Cu1+ and one N3- atom. The C–N bond length is 1.18 Å. In the second C2+ site, C2+ is bonded in a distorted linear geometry to one Cu1+ and one N3- atom. The C–N bond length is 1.18 Å. In the third C2+ site, C2+ is bonded in a distorted linear geometry to one Cu1+ and one N3- atom. The C–N bond length is 1.18 Å. There are three inequivalent N3- sites. In the first N3- site, N3- is bonded in a bent 150 degrees geometry to one Cu1+ and one C2+ atom. In the second N3- site, N3- is bonded in a linear geometry to one Cu1+ and one C2+ atom. In the third N3- site, N3- is bonded in a linear geometry to one Cu1+ and one C2+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-07-15. Materials Data on Cu2H6C3N4O by Materials Project. https://doi.org/10.17188/1285174

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↗