Search NASA⌕ Search

DOE OSTI · 1281572

Materials Data on TeWCl9 by Materials Project

Abstract

WTeCl9 crystallizes in the triclinic P-1 space group. The structure is one-dimensional and consists of one WTeCl9 ribbon oriented in the (1, 0, 0) direction. W5+ is bonded to six Cl1- atoms to form WCl6 octahedra that share corners with three equivalent TeCl6 octahedra. The corner-sharing octahedra tilt angles range from 45–57°. There are a spread of W–Cl bond distances ranging from 2.28–2.43 Å. Te4+ is bonded to six Cl1- atoms to form distorted TeCl6 octahedra that share corners with three equivalent WCl6 octahedra. The corner-sharing octahedra tilt angles range from 45–57°. There are a spread of Te–Cl bond distances ranging from 2.33–3.22 Å. There are nine inequivalent Cl1- sites. In the first Cl1- site, Cl1- is bonded in a 2-coordinate geometry to one W5+ and one Te4+ atom. In the second Cl1- site, Cl1- is bonded in a distorted bent 120 degrees geometry to one W5+ and one Te4+ atom. In the third Cl1- site, Cl1- is bonded in a single-bond geometry to one W5+ atom. In the fourth Cl1- site, Cl1- is bonded in a single-bond geometry to one W5+ atom. In the fifth Cl1- site, Cl1- is bonded in a single-bond geometry to one Te4+ atom. In the sixth Cl1- site, Cl1- is bonded in a distorted bent 120 degrees geometry to one W5+ and one Te4+ atom. In the seventh Cl1- site, Cl1- is bonded in a single-bond geometry to one Te4+ atom. In the eighth Cl1- site, Cl1- is bonded in a single-bond geometry to one Te4+ atom. In the ninth Cl1- site, Cl1- is bonded in a single-bond geometry to one W5+ atom.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

2020-07-18. Materials Data on TeWCl9 by Materials Project. https://doi.org/10.17188/1281572

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↗