Study of by-product of NaBH4 hydrolysis and its behavior at a room temperature

N. Stepanov; V. Uvarov; I. Popov; Y. Sasson

doi:10.1016/j.ijhydene.2008.09.052

Study of by-product of NaBH₄ hydrolysis and its behavior at a room temperature

N. Stepanov, V. Uvarov^*, I. Popov, Y. Sasson

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

We report here the observation of phase transitions within mixtures of NaBH₄ and various organic additives exposed to open air at a room temperature 22(±1) °C and air humidity 35(±5)%. During the exposure the phase composition of materials was monitored by X-ray diffraction. Also, we found that new crystal phases appear during the exposure. Initially the phase, which was identified as the orthorhombic phase with unit cell parameters a = 10.48Å , b = 6.91Å and c = 12.25Å and Pbca space group, was formed. It has been ascertained that orthorhombic phase is NaBH ₄·2H₂O - hydrated sodium boron hydride. Upon prolonged exposure this phase then finally transformed to the known crystalline tincalconite (Na₂B₄O₅(OH)₄· 3H₂O). We explained the observed phase transitions as hydrolysis of NaBH₄ and hydration of by-product due to absorption of air humidity. It was ascertained that kinetics of processes depends on kind of organic additives.

Original language	English
Pages (from-to)	7378-7384
Number of pages	7
Journal	International Journal of Hydrogen Energy
Volume	33
Issue number	24
DOIs	https://doi.org/10.1016/j.ijhydene.2008.09.052
State	Published - Dec 2008

Keywords

Hydrated sodium borates
Hydrogen storage material
Phase transformation
Sodium borohydride
X-ray diffraction characterization

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10.1016/j.ijhydene.2008.09.052

Cite this

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title = "Study of by-product of NaBH4 hydrolysis and its behavior at a room temperature",

abstract = "We report here the observation of phase transitions within mixtures of NaBH4 and various organic additives exposed to open air at a room temperature 22(±1) °C and air humidity 35(±5)%. During the exposure the phase composition of materials was monitored by X-ray diffraction. Also, we found that new crystal phases appear during the exposure. Initially the phase, which was identified as the orthorhombic phase with unit cell parameters a = 10.48{\AA} , b = 6.91{\AA} and c = 12.25{\AA} and Pbca space group, was formed. It has been ascertained that orthorhombic phase is NaBH 4·2H2O - hydrated sodium boron hydride. Upon prolonged exposure this phase then finally transformed to the known crystalline tincalconite (Na2B4O5(OH)4· 3H2O). We explained the observed phase transitions as hydrolysis of NaBH4 and hydration of by-product due to absorption of air humidity. It was ascertained that kinetics of processes depends on kind of organic additives.",

keywords = "Hydrated sodium borates, Hydrogen storage material, Phase transformation, Sodium borohydride, X-ray diffraction characterization",

author = "N. Stepanov and V. Uvarov and I. Popov and Y. Sasson",

year = "2008",

month = dec,

doi = "10.1016/j.ijhydene.2008.09.052",

language = "אנגלית",

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journal = "International Journal of Hydrogen Energy",

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AU - Stepanov, N.

AU - Uvarov, V.

AU - Popov, I.

AU - Sasson, Y.

PY - 2008/12

Y1 - 2008/12

N2 - We report here the observation of phase transitions within mixtures of NaBH4 and various organic additives exposed to open air at a room temperature 22(±1) °C and air humidity 35(±5)%. During the exposure the phase composition of materials was monitored by X-ray diffraction. Also, we found that new crystal phases appear during the exposure. Initially the phase, which was identified as the orthorhombic phase with unit cell parameters a = 10.48Å , b = 6.91Å and c = 12.25Å and Pbca space group, was formed. It has been ascertained that orthorhombic phase is NaBH 4·2H2O - hydrated sodium boron hydride. Upon prolonged exposure this phase then finally transformed to the known crystalline tincalconite (Na2B4O5(OH)4· 3H2O). We explained the observed phase transitions as hydrolysis of NaBH4 and hydration of by-product due to absorption of air humidity. It was ascertained that kinetics of processes depends on kind of organic additives.

AB - We report here the observation of phase transitions within mixtures of NaBH4 and various organic additives exposed to open air at a room temperature 22(±1) °C and air humidity 35(±5)%. During the exposure the phase composition of materials was monitored by X-ray diffraction. Also, we found that new crystal phases appear during the exposure. Initially the phase, which was identified as the orthorhombic phase with unit cell parameters a = 10.48Å , b = 6.91Å and c = 12.25Å and Pbca space group, was formed. It has been ascertained that orthorhombic phase is NaBH 4·2H2O - hydrated sodium boron hydride. Upon prolonged exposure this phase then finally transformed to the known crystalline tincalconite (Na2B4O5(OH)4· 3H2O). We explained the observed phase transitions as hydrolysis of NaBH4 and hydration of by-product due to absorption of air humidity. It was ascertained that kinetics of processes depends on kind of organic additives.

KW - Hydrated sodium borates

KW - Hydrogen storage material

KW - Phase transformation

KW - Sodium borohydride

KW - X-ray diffraction characterization

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