Alkali Metal Hydride Modification on Hydrazine Boranes for Improved Dehydrogenation

Published

May 29, 2014

Author(s)

Yong Shen Chua, Qijun Pei, Xiaohua Ju, Wei Zhou, Terrence J. Udovic, Guotao Wu, Zhitao Xiong, Ping Chen, Hui Wu

Abstract

Hydrazinoboranes of various alkali metals, i.e., NaN₂H₃BH₃ and KN₂H₃BH₃, were synthesized via a liquid approach. The crystal structures of NaN₂H₃BH₃ were determined and their dehydrogenation properties were compared with LiN₂H₃BH₃ and N₂H₄BH₃. A clear correlation between sizes of metal cations in hydrazinoboranes and their corresponding melting and dehydrogenation temperatures was found dependent on the melting temperature. Upon approaching the melting points, alkali metal hydrazinoboranes dehydrogenate rapidly in the first step, giving rise to the formation of intermediates that possess N₂BH₂, N₂BH and NBH₃ species. Compared to pristine N₂H₄BH₃, the alkali-metal substituted hyrazinoboranes demonstrate significantly improved dehydrogenation behavior with no N₂H₄ emission and greatly suppressed NH₃ release.

Citation

Journal of Physical Chemistry C

Volume

118

Pub Type

Journals

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Keywords

complex hydrides, hydrogen storage, crystal chemistry, dehydrogenation

Citation

Chua, Y. , Pei, Q. , Ju, X. , Zhou, W. , Udovic, T. , Wu, G. , Xiong, Z. , Chen, P. and Wu, H. (2014), Alkali Metal Hydride Modification on Hydrazine Boranes for Improved Dehydrogenation, Journal of Physical Chemistry C, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915728 (Accessed December 22, 2024)