LiBH4/SBA-15 Nanocomposites Prepared by Melt Infiltration under Hydrogen Pressure: Synthesis and Hydrogen Sorption Properties

P. Ngene; P.A. Adelhelm; A.M. Beale; K.P. de Jong; P.E. de Jongh

doi:10.1021/jp9065949

LiBH4/SBA-15 Nanocomposites Prepared by Melt Infiltration under Hydrogen Pressure: Synthesis and Hydrogen Sorption Properties

P. Ngene, P.A. Adelhelm, A.M. Beale, K.P. de Jong, P.E. de Jongh

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

Abstract

Lithium borohydride (LiBH4) is a promising material for hydrogen storage, with a gravimetric hydrogen content of 18.5%. However, the thermodynamics and kinetics of its hydrogen release and uptake need to be improved before it can meet the requirements for mobile applications. In this study, we investigate the confinement of LiBH4 in ordered mesoporous SiO2 and its effect on the hydrogen sorption properties. We demonstrate that, only under hydrogen pressure, melt infiltration is an effective method for the synthesis of LiBH4/SBA-15 nanocomposites. Our work clearly shows that formation of lithium silicates from LiBH4 and SiO2 can effectively be suppressed by hydrogen. Thus, under hydrogen pressure, LiBH4 can fully fill the mesopores of SBA-15 while the long-range order of the mesopores is maintained. The confined LiBH4 has enhanced hydrogen desorption properties, with desorption starting at 150 °C. However, upon dehydrogenation, SiO2 and decomposition products of LiBH4 react to form Li2SiO3 and Li4SiO4, leading to irreversible hydrogen loss.

Original language	English
Pages (from-to)	6163-6168
Number of pages	6
Journal	Journal of Physical Chemistry C
Volume	114
DOIs	https://doi.org/10.1021/jp9065949
Publication status	Published - 2013

Access to Document

10.1021/jp9065949

Embargoed Document

NgeneLiBH4SBA-15
Final published version, 1.22 MB
Embargo ends: 1/01/50

Cite this

@article{de0921722d6d4768a382be6af0911c64,

title = "LiBH4/SBA-15 Nanocomposites Prepared by Melt Infiltration under Hydrogen Pressure: Synthesis and Hydrogen Sorption Properties",

abstract = "Lithium borohydride (LiBH4) is a promising material for hydrogen storage, with a gravimetric hydrogen content of 18.5%. However, the thermodynamics and kinetics of its hydrogen release and uptake need to be improved before it can meet the requirements for mobile applications. In this study, we investigate the confinement of LiBH4 in ordered mesoporous SiO2 and its effect on the hydrogen sorption properties. We demonstrate that, only under hydrogen pressure, melt infiltration is an effective method for the synthesis of LiBH4/SBA-15 nanocomposites. Our work clearly shows that formation of lithium silicates from LiBH4 and SiO2 can effectively be suppressed by hydrogen. Thus, under hydrogen pressure, LiBH4 can fully fill the mesopores of SBA-15 while the long-range order of the mesopores is maintained. The confined LiBH4 has enhanced hydrogen desorption properties, with desorption starting at 150 °C. However, upon dehydrogenation, SiO2 and decomposition products of LiBH4 react to form Li2SiO3 and Li4SiO4, leading to irreversible hydrogen loss.",

author = "P. Ngene and P.A. Adelhelm and A.M. Beale and {de Jong}, K.P. and {de Jongh}, P.E.",

year = "2013",

doi = "10.1021/jp9065949",

language = "English",

volume = "114",

pages = "6163--6168",

journal = "Journal of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

}

TY - JOUR

T1 - LiBH4/SBA-15 Nanocomposites Prepared by Melt Infiltration under Hydrogen Pressure: Synthesis and Hydrogen Sorption Properties

AU - Ngene, P.

AU - Adelhelm, P.A.

AU - Beale, A.M.

AU - de Jong, K.P.

AU - de Jongh, P.E.

PY - 2013

Y1 - 2013

N2 - Lithium borohydride (LiBH4) is a promising material for hydrogen storage, with a gravimetric hydrogen content of 18.5%. However, the thermodynamics and kinetics of its hydrogen release and uptake need to be improved before it can meet the requirements for mobile applications. In this study, we investigate the confinement of LiBH4 in ordered mesoporous SiO2 and its effect on the hydrogen sorption properties. We demonstrate that, only under hydrogen pressure, melt infiltration is an effective method for the synthesis of LiBH4/SBA-15 nanocomposites. Our work clearly shows that formation of lithium silicates from LiBH4 and SiO2 can effectively be suppressed by hydrogen. Thus, under hydrogen pressure, LiBH4 can fully fill the mesopores of SBA-15 while the long-range order of the mesopores is maintained. The confined LiBH4 has enhanced hydrogen desorption properties, with desorption starting at 150 °C. However, upon dehydrogenation, SiO2 and decomposition products of LiBH4 react to form Li2SiO3 and Li4SiO4, leading to irreversible hydrogen loss.

AB - Lithium borohydride (LiBH4) is a promising material for hydrogen storage, with a gravimetric hydrogen content of 18.5%. However, the thermodynamics and kinetics of its hydrogen release and uptake need to be improved before it can meet the requirements for mobile applications. In this study, we investigate the confinement of LiBH4 in ordered mesoporous SiO2 and its effect on the hydrogen sorption properties. We demonstrate that, only under hydrogen pressure, melt infiltration is an effective method for the synthesis of LiBH4/SBA-15 nanocomposites. Our work clearly shows that formation of lithium silicates from LiBH4 and SiO2 can effectively be suppressed by hydrogen. Thus, under hydrogen pressure, LiBH4 can fully fill the mesopores of SBA-15 while the long-range order of the mesopores is maintained. The confined LiBH4 has enhanced hydrogen desorption properties, with desorption starting at 150 °C. However, upon dehydrogenation, SiO2 and decomposition products of LiBH4 react to form Li2SiO3 and Li4SiO4, leading to irreversible hydrogen loss.

U2 - 10.1021/jp9065949

DO - 10.1021/jp9065949

M3 - Article

SN - 1932-7447

VL - 114

SP - 6163

EP - 6168

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

ER -

LiBH4/SBA-15 Nanocomposites Prepared by Melt Infiltration under Hydrogen Pressure: Synthesis and Hydrogen Sorption Properties

Abstract

Access to Document

Embargoed Document

Fingerprint

Cite this