Hydrogen tracer diffusion in LiBH4 measured by spatially resolved Raman spectroscopy

A. Borgschulte; R. Gremaud; Z. Łodziana; A. Züttel

doi:10.1039/C000229A

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Hydrogentracer diffusion in LiBH₄ measured by spatially resolved Raman spectroscopy

A. Borgschulte,*^a R. Gremaud,^a Z. Łodziana^a and A. Züttel^a

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* Corresponding authors

^a Empa, Swiss Federal Laboratories for Materials Testing and Research, Laboratory 138, Hydrogen & Energy, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
E-mail: andreas.borgschulte@empa.ch

Abstract

The hydrogen tracer diffusion in LiBH₄ has been determined by spatially resolved Raman spectroscopy. The measurements give direct evidence of a macroscopic diffusion of BH⁻₄ ions as well as atomic exchange of hydrogen between the anions. An effective tracer diffusion coefficient of deuterium in LiBH₄ of D ≃ 7 × 10⁻¹⁴m² s⁻¹ at 473 K is derived. The direct exchange rate of hydrogen between BH₄ units is 10 orders of magnitude slower, i.e. the relatively fast effective hydrogen diffusion has its origin in the fast diffusion of BH₄ units.

This article is part of the themed collection: Molecular mechanisms of the photostability of life

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Article information

DOI: https://doi.org/10.1039/C000229A
Article type: Paper
Submitted: 05 Jan 2010
Accepted: 12 Feb 2010
First published: 29 Mar 2010

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Phys. Chem. Chem. Phys., 2010,12, 5061-5066

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Hydrogen tracer diffusion in LiBH₄ measured by spatially resolved Raman spectroscopy

A. Borgschulte, R. Gremaud, Z. Łodziana and A. Züttel, Phys. Chem. Chem. Phys., 2010, 12, 5061 DOI: 10.1039/C000229A

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