Effective nanoconfinement of 2LiBH4-MgH2 via simply MgH2 premilling for reversible hydrogen storages

Rapee Gosalawit Utke; Sophida Thiangviriya; Payam Javadian; Daniel Laipple; Claudio Pistidda; Nils Bergemann; Christian Horstmann; Torben R. Jensen; Thomas Klassen; Martin Dornheim

doi:10.1016/j.ijhydene.2014.07.167

Effective nanoconfinement of 2LiBH₄-MgH₂ via simply MgH₂ premilling for reversible hydrogen storages

Rapee Gosalawit Utke^*, Sophida Thiangviriya, Payam Javadian, Daniel Laipple, Claudio Pistidda, Nils Bergemann, Christian Horstmann, Torben R. Jensen, Thomas Klassen, Martin Dornheim

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

38 Citations (Scopus)

Abstract

To improve nanoconfinement of LiBH4 and MgH2 in carbon aerogel scaffold (CAS), particle size reduction of MgH2 by premilling technique before melt infiltration is proposed. MgH2 is premilled for 5 h prior to milling with LiBH4 and nanoconfinement in CAS to obtained nanoconfined 2LiBH(4)-premilled MgH2. Significant confinement of both LiBH4 and MgH2 in CAS, confirmed by SEM-EDS mapping results, is achieved due to MgH2 premilling. Due to effective nanoconfinement, enhancement of CAS:hydride composite weight ratio to 1:1, resulting in increase of hydrogen storage capacity, is possible. Nanoconfined 2LiBH(4)-premilled MgH2 reveals a single-step dehydrogenation at 345 degrees C with no B2H6 release, while dehydrogenation of nanoconfined sample without MgH2 premilling performs in multiple steps at elevated temperatures (up to 430 degrees C) together with considerable amount of B2H6 release. Activation energy (E-A) for the main dehydrogenation of nanoconfined 2LiBH(4)-premilled MgH2 is considerably lower than those of LiBH4 and MgH2 of bulk 2LiBH(4)-MgH2 (Delta E-A = 31.9 and 55.8 kJ/mol with respect to LiBH4 and MgH2, respectively). Approximately twice faster dehydrogenation rate are accomplished after MgH2 premilling. Three hydrogen release (T = 320 degrees C, P(H-2) = 3-4 bar) and uptake (T = 320-325 degrees C, P(H-2) = 84 bar) cycles of nanoconfined 2LiBH(4)-premilled MgH2 reveal up to 4.96 wt. % H-2 (10 Wt. % H-2 with respect to hydride composite content), while the 1st desorption of nanoconfined sample without MgH2 premilling gives 4.30 wt. % of combined B2H6 and H-2 gases. It should be remarked that not only kinetic improvement and B2H6 suppression are obtained by MgH2 premilling, but also the lowest dehydrogenation temperature (T = 320 degrees C) among other modified 2LiBH(4)-MgH2 systems is acquired. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Original language	English
Journal	International Journal of Hydrogen Energy
Volume	39
Issue	28
Pages (from-to)	15614-15626
Number of pages	13
ISSN	0360-3199
DOIs	https://doi.org/10.1016/j.ijhydene.2014.07.167
Publication status	Published - Sept 2014

Keywords

B2H6 suppression
Kinetic improvement
low dehydrogenation temperature
Reduction of activation energy
Particle size reduction
CARBON AEROGEL SCAFFOLD
LIBH4
COMPOSITES
THERMODYNAMICS
KINETICS
PATHWAY
SYSTEM

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10.1016/j.ijhydene.2014.07.167

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@article{12543671744a4db9b8f28222b312113f,

title = "Effective nanoconfinement of 2LiBH4-MgH2 via simply MgH2 premilling for reversible hydrogen storages",

abstract = "To improve nanoconfinement of LiBH4 and MgH2 in carbon aerogel scaffold (CAS), particle size reduction of MgH2 by premilling technique before melt infiltration is proposed. MgH2 is premilled for 5 h prior to milling with LiBH4 and nanoconfinement in CAS to obtained nanoconfined 2LiBH(4)-premilled MgH2. Significant confinement of both LiBH4 and MgH2 in CAS, confirmed by SEM-EDS mapping results, is achieved due to MgH2 premilling. Due to effective nanoconfinement, enhancement of CAS:hydride composite weight ratio to 1:1, resulting in increase of hydrogen storage capacity, is possible. Nanoconfined 2LiBH(4)-premilled MgH2 reveals a single-step dehydrogenation at 345 degrees C with no B2H6 release, while dehydrogenation of nanoconfined sample without MgH2 premilling performs in multiple steps at elevated temperatures (up to 430 degrees C) together with considerable amount of B2H6 release. Activation energy (E-A) for the main dehydrogenation of nanoconfined 2LiBH(4)-premilled MgH2 is considerably lower than those of LiBH4 and MgH2 of bulk 2LiBH(4)-MgH2 (Delta E-A = 31.9 and 55.8 kJ/mol with respect to LiBH4 and MgH2, respectively). Approximately twice faster dehydrogenation rate are accomplished after MgH2 premilling. Three hydrogen release (T = 320 degrees C, P(H-2) = 3-4 bar) and uptake (T = 320-325 degrees C, P(H-2) = 84 bar) cycles of nanoconfined 2LiBH(4)-premilled MgH2 reveal up to 4.96 wt. % H-2 (10 Wt. % H-2 with respect to hydride composite content), while the 1st desorption of nanoconfined sample without MgH2 premilling gives 4.30 wt. % of combined B2H6 and H-2 gases. It should be remarked that not only kinetic improvement and B2H6 suppression are obtained by MgH2 premilling, but also the lowest dehydrogenation temperature (T = 320 degrees C) among other modified 2LiBH(4)-MgH2 systems is acquired. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.",

keywords = "B2H6 suppression, Kinetic improvement, low dehydrogenation temperature, Reduction of activation energy, Particle size reduction, CARBON AEROGEL SCAFFOLD, LIBH4, COMPOSITES, THERMODYNAMICS, KINETICS, PATHWAY, SYSTEM",

author = "Utke, {Rapee Gosalawit} and Sophida Thiangviriya and Payam Javadian and Daniel Laipple and Claudio Pistidda and Nils Bergemann and Christian Horstmann and Jensen, {Torben R.} and Thomas Klassen and Martin Dornheim",

year = "2014",

month = sep,

doi = "10.1016/j.ijhydene.2014.07.167",

language = "English",

volume = "39",

pages = "15614--15626",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

publisher = "Elsevier Ltd",

number = "28",

}

Effective nanoconfinement of 2LiBH₄-MgH₂ via simply MgH₂ premilling for reversible hydrogen storages. / Utke, Rapee Gosalawit; Thiangviriya, Sophida; Javadian, Payam et al.
In: International Journal of Hydrogen Energy, Vol. 39, No. 28, 09.2014, p. 15614-15626.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - Effective nanoconfinement of 2LiBH4-MgH2 via simply MgH2 premilling for reversible hydrogen storages

AU - Utke, Rapee Gosalawit

AU - Thiangviriya, Sophida

AU - Javadian, Payam

AU - Laipple, Daniel

AU - Pistidda, Claudio

AU - Bergemann, Nils

AU - Horstmann, Christian

AU - Jensen, Torben R.

AU - Klassen, Thomas

AU - Dornheim, Martin

PY - 2014/9

Y1 - 2014/9

N2 - To improve nanoconfinement of LiBH4 and MgH2 in carbon aerogel scaffold (CAS), particle size reduction of MgH2 by premilling technique before melt infiltration is proposed. MgH2 is premilled for 5 h prior to milling with LiBH4 and nanoconfinement in CAS to obtained nanoconfined 2LiBH(4)-premilled MgH2. Significant confinement of both LiBH4 and MgH2 in CAS, confirmed by SEM-EDS mapping results, is achieved due to MgH2 premilling. Due to effective nanoconfinement, enhancement of CAS:hydride composite weight ratio to 1:1, resulting in increase of hydrogen storage capacity, is possible. Nanoconfined 2LiBH(4)-premilled MgH2 reveals a single-step dehydrogenation at 345 degrees C with no B2H6 release, while dehydrogenation of nanoconfined sample without MgH2 premilling performs in multiple steps at elevated temperatures (up to 430 degrees C) together with considerable amount of B2H6 release. Activation energy (E-A) for the main dehydrogenation of nanoconfined 2LiBH(4)-premilled MgH2 is considerably lower than those of LiBH4 and MgH2 of bulk 2LiBH(4)-MgH2 (Delta E-A = 31.9 and 55.8 kJ/mol with respect to LiBH4 and MgH2, respectively). Approximately twice faster dehydrogenation rate are accomplished after MgH2 premilling. Three hydrogen release (T = 320 degrees C, P(H-2) = 3-4 bar) and uptake (T = 320-325 degrees C, P(H-2) = 84 bar) cycles of nanoconfined 2LiBH(4)-premilled MgH2 reveal up to 4.96 wt. % H-2 (10 Wt. % H-2 with respect to hydride composite content), while the 1st desorption of nanoconfined sample without MgH2 premilling gives 4.30 wt. % of combined B2H6 and H-2 gases. It should be remarked that not only kinetic improvement and B2H6 suppression are obtained by MgH2 premilling, but also the lowest dehydrogenation temperature (T = 320 degrees C) among other modified 2LiBH(4)-MgH2 systems is acquired. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

AB - To improve nanoconfinement of LiBH4 and MgH2 in carbon aerogel scaffold (CAS), particle size reduction of MgH2 by premilling technique before melt infiltration is proposed. MgH2 is premilled for 5 h prior to milling with LiBH4 and nanoconfinement in CAS to obtained nanoconfined 2LiBH(4)-premilled MgH2. Significant confinement of both LiBH4 and MgH2 in CAS, confirmed by SEM-EDS mapping results, is achieved due to MgH2 premilling. Due to effective nanoconfinement, enhancement of CAS:hydride composite weight ratio to 1:1, resulting in increase of hydrogen storage capacity, is possible. Nanoconfined 2LiBH(4)-premilled MgH2 reveals a single-step dehydrogenation at 345 degrees C with no B2H6 release, while dehydrogenation of nanoconfined sample without MgH2 premilling performs in multiple steps at elevated temperatures (up to 430 degrees C) together with considerable amount of B2H6 release. Activation energy (E-A) for the main dehydrogenation of nanoconfined 2LiBH(4)-premilled MgH2 is considerably lower than those of LiBH4 and MgH2 of bulk 2LiBH(4)-MgH2 (Delta E-A = 31.9 and 55.8 kJ/mol with respect to LiBH4 and MgH2, respectively). Approximately twice faster dehydrogenation rate are accomplished after MgH2 premilling. Three hydrogen release (T = 320 degrees C, P(H-2) = 3-4 bar) and uptake (T = 320-325 degrees C, P(H-2) = 84 bar) cycles of nanoconfined 2LiBH(4)-premilled MgH2 reveal up to 4.96 wt. % H-2 (10 Wt. % H-2 with respect to hydride composite content), while the 1st desorption of nanoconfined sample without MgH2 premilling gives 4.30 wt. % of combined B2H6 and H-2 gases. It should be remarked that not only kinetic improvement and B2H6 suppression are obtained by MgH2 premilling, but also the lowest dehydrogenation temperature (T = 320 degrees C) among other modified 2LiBH(4)-MgH2 systems is acquired. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

KW - B2H6 suppression

KW - Kinetic improvement

KW - low dehydrogenation temperature

KW - Reduction of activation energy

KW - Particle size reduction

KW - CARBON AEROGEL SCAFFOLD

KW - LIBH4

KW - COMPOSITES

KW - THERMODYNAMICS

KW - KINETICS

KW - PATHWAY

KW - SYSTEM

U2 - 10.1016/j.ijhydene.2014.07.167

DO - 10.1016/j.ijhydene.2014.07.167

M3 - Journal article

SN - 0360-3199

VL - 39

SP - 15614

EP - 15626

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 28

ER -