Mn-based borohydride synthesized by ball-milling KBH4 and MnCl2 for hydrogen storage

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Mn-based borohydride synthesized by ball-milling KBH4 and MnCl2 for hydrogen storage. / Liu, Ruixia; Book, David.

In: International Journal of Hydrogen Energy, Vol. 39, No. 5, 04.02.2014, p. 2194-2200.

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@article{3c9c530e55bb45029c29fdd87947f5d3,
title = "Mn-based borohydride synthesized by ball-milling KBH4 and MnCl2 for hydrogen storage",
abstract = "In this work, a mixed-cation borohydride (K2Mn(BH4)4) with P21/n structure was successfully synthesized by mechanochemical milling of the 2KBH4–MnCl2 sample under argon. The structural and thermal decomposition properties of the borohydride compounds were investigated using XRD, Raman spectroscopy, FTIR, TGA-MS and DSC. Apart from K2Mn(BH4)4, the KMnCl3 and unreacted KBH4 compounds were present in the milled 2KBH4–MnCl2. The two mass loss regions were observed for the milled sample: one was from 100 to 160 °C with a 1.6 ± 0.1 wt% loss (a release of majority hydrogen and trace diborane), which was associated with the decomposition of K2Mn(BH4)4 to form KBH4, boron, and finely dispersed manganese; the other was from 165 to 260 °C with a 1.9 ± 0.1 wt% loss (only hydrogen release), which was due to the reaction of KBH4 with KMnCl3 to give KCl, boron, finely dispersed manganese. Simultaneously, the formed KCl could dissolve in KBH4 to yield a K(BH4)xCl1−x solid solution, and also react with KMnCl3 to form a new compound K4MnCl6.",
keywords = "Mixed-cation manganese borohydride, Hydrogen storage, Mechanochemical synthesis, Thermal decomposition",
author = "Ruixia Liu and David Book",
year = "2014",
month = feb,
day = "4",
doi = "10.1016/j.ijhydene.2013.11.125",
language = "English",
volume = "39",
pages = "2194--2200",
journal = "International Journal of Hydrogen Energy",
issn = "0360-3199",
publisher = "Elsevier",
number = "5",

}

RIS

TY - JOUR

T1 - Mn-based borohydride synthesized by ball-milling KBH4 and MnCl2 for hydrogen storage

AU - Liu, Ruixia

AU - Book, David

PY - 2014/2/4

Y1 - 2014/2/4

N2 - In this work, a mixed-cation borohydride (K2Mn(BH4)4) with P21/n structure was successfully synthesized by mechanochemical milling of the 2KBH4–MnCl2 sample under argon. The structural and thermal decomposition properties of the borohydride compounds were investigated using XRD, Raman spectroscopy, FTIR, TGA-MS and DSC. Apart from K2Mn(BH4)4, the KMnCl3 and unreacted KBH4 compounds were present in the milled 2KBH4–MnCl2. The two mass loss regions were observed for the milled sample: one was from 100 to 160 °C with a 1.6 ± 0.1 wt% loss (a release of majority hydrogen and trace diborane), which was associated with the decomposition of K2Mn(BH4)4 to form KBH4, boron, and finely dispersed manganese; the other was from 165 to 260 °C with a 1.9 ± 0.1 wt% loss (only hydrogen release), which was due to the reaction of KBH4 with KMnCl3 to give KCl, boron, finely dispersed manganese. Simultaneously, the formed KCl could dissolve in KBH4 to yield a K(BH4)xCl1−x solid solution, and also react with KMnCl3 to form a new compound K4MnCl6.

AB - In this work, a mixed-cation borohydride (K2Mn(BH4)4) with P21/n structure was successfully synthesized by mechanochemical milling of the 2KBH4–MnCl2 sample under argon. The structural and thermal decomposition properties of the borohydride compounds were investigated using XRD, Raman spectroscopy, FTIR, TGA-MS and DSC. Apart from K2Mn(BH4)4, the KMnCl3 and unreacted KBH4 compounds were present in the milled 2KBH4–MnCl2. The two mass loss regions were observed for the milled sample: one was from 100 to 160 °C with a 1.6 ± 0.1 wt% loss (a release of majority hydrogen and trace diborane), which was associated with the decomposition of K2Mn(BH4)4 to form KBH4, boron, and finely dispersed manganese; the other was from 165 to 260 °C with a 1.9 ± 0.1 wt% loss (only hydrogen release), which was due to the reaction of KBH4 with KMnCl3 to give KCl, boron, finely dispersed manganese. Simultaneously, the formed KCl could dissolve in KBH4 to yield a K(BH4)xCl1−x solid solution, and also react with KMnCl3 to form a new compound K4MnCl6.

KW - Mixed-cation manganese borohydride

KW - Hydrogen storage

KW - Mechanochemical synthesis

KW - Thermal decomposition

U2 - 10.1016/j.ijhydene.2013.11.125

DO - 10.1016/j.ijhydene.2013.11.125

M3 - Article

VL - 39

SP - 2194

EP - 2200

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 5

ER -