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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

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Published on: May 15, 2015

Diborane release and structure distortion in borohydrides.

Elsa Callini¹, Andreas Borgschulte, Anibal Javier Ramirez-Cuesta

¹Empa, Swiss Federal Laboratories for Materials Testing and Research, Hydrogen & Energy, CH-8600 Dübendorf, Switzerland.

Dalton Transactions (Cambridge, England : 2003)

|October 11, 2012

Summary

This summary is machine-generated.

Diborane release during borohydride decomposition is linked to cation electronegativity and anion distortion. A new model explains diborane formation via BH(2)(δ+) and BH(4)(δ-) recombination, supported by mass spectroscopy.

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Area of Science:

Materials Science
Inorganic Chemistry
Chemical Engineering

Background:

Hydrogen desorption from borohydrides often releases diborane.
Diborane byproduct formation scales inversely with borohydride stability.
Cation electronegativity influences borohydride stability and decomposition pathways.

Purpose of the Study:

To present a model explaining diborane formation during borohydride decomposition.
To correlate anion distortion with diborane release.
To investigate the decomposition mechanisms of LiZn(2)(BH(4))(5) and LiBH(4).

Main Methods:

Theoretical modeling based on symmetric and asymmetric assembly of B(2)H(6) units.
Analysis of anion distortion using vibrational spectroscopy (Badger's rule).
Ultra-high vacuum (UHV) mass spectroscopy measurements.

Main Results:

A model is proposed where diborane forms from BH(2)(δ+) and BH(4)(δ-) recombination on the surface.
Anion distortion, measured by vibrational mode energy differences, correlates with diborane release.
UHV mass spectroscopy confirms the model and differentiates decomposition in stable vs. unstable borohydrides.

Conclusions:

The degree of cation ionization dictates BH(4)(-) anion distortion, influencing diborane byproduct formation.
The presented model provides a mechanistic understanding of diborane release from borohydrides.
Sublimation and decomposition are competing processes for borohydrides under UHV conditions.