Campus Units

Materials Science and Engineering, Chemistry, Ames Laboratory

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

8-21-2016

Journal or Book Title

Journal of Materials Chemistry A

Volume

4

Issue

31

First Page

12188

Last Page

12196

DOI

10.1039/C6TA04391G

Abstract

Alkali metal monohydrides, AH (A = Li–Cs) have been synthesized in quantitative yields at room temperature by reactive milling of alkali metals in the presence of hydrogen gas at 200 bar or less. The mechanochemical approach reported here eliminates problems associated with the malleability of alkali metals — especially Li, Na, and K — and promotes effective solid–gas reactions, ensuring their completion. This is achieved by incorporating a certain volume fraction of the corresponding hydride powder as a process control agent, which allows continuous and efficient milling primarily by coating the surface of metal particles, effectively blocking cold welding. Formation of high-purity crystalline monohydrides has been confirmed by powder X-ray diffraction, solid-state NMR spectroscopy, and volumetric analyses of reactively desorbed H2 from as-milled samples. The proposed synthesis method is scalable and particularly effective for extremely air-sensitive materials, such as alkali and alkaline earth metal hydrides. The technique may also be favorable for production in continuous reactors operating at room temperature, thereby reducing the total processing time, energy consumption and, hence, the cost of production of these hydrides or their derivatives and composites.

Comments

This is a manuscript of an article published as Hlova, Ihor Z., Andra Castle, Jennifer F. Goldston, Shalabh Gupta, Timothy Prost, Takeshi Kobayashi, L. Scott Chumbley, Marek Pruski, and Vitalij K. Pecharsky. "Solvent-and catalyst-free mechanochemical synthesis of alkali metal monohydrides." Journal of Materials Chemistry A 4, no. 31 (2016): 12188-12196. DOI: 10.1039/C6TA04391G. Posted with permission.

Copyright Owner

The Royal Society of Chemistry

Language

en

Published Version

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