Low-temperature hydrogen desorption from Mg(BH4)2 catalysed by ultrafine Ni nanoparticles in a mesoporous carbon matrix

Mohammad A. Wahab; David J. Young; Azharul Karim; Sabrina Fawzia; Jorge N. Beltramini

doi:10.1016/j.ijhydene.2016.09.098

Low-temperature hydrogen desorption from Mg(BH₄)₂ catalysed by ultrafine Ni nanoparticles in a mesoporous carbon matrix

Mohammad A. Wahab, David J. Young, Azharul Karim, Sabrina Fawzia, Jorge N. Beltramini

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

Abstract

Homogenously dispersed, ultrafine Ni nanoparticles (Ni NPs) have been grown in a mesoporous carbon (MC) matrix (MC-Ni_insitu) and efficiently catalyze low-temperature hydrogen desorption from Mg(BH₄)₂. The onset desorption temperature (T_onset) of this MC-Ni_insitu-Mg(BH₄)₂ system is 44 °C compared to 275 °C (T_onset) for pure Mg(BH₄)₂. This is the lowest value reported for hydrogen desorption from this metal hydride. The activation energy (E_a) of MC-Ni_insitu-Mg(BH₄)₂ was determined to be 21.3 kJ/mol which is less than half the value of 45.9 kJ/mol for pure Mg(BH₄)₂. We ascribe this reduction to the synergistic effects of nanoconfinement and the homogeneously dispersed, ultrafine Ni NPs active sites in the mesoporous carbon.

Original language	English
Pages (from-to)	20573-20582
Number of pages	10
Journal	International Journal of Hydrogen Energy
Volume	41
Issue number	45
DOIs	https://doi.org/10.1016/j.ijhydene.2016.09.098
Publication status	Published - 7 Dec 2016
Externally published	Yes

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title = "Low-temperature hydrogen desorption from Mg(BH4)2 catalysed by ultrafine Ni nanoparticles in a mesoporous carbon matrix",

abstract = "Homogenously dispersed, ultrafine Ni nanoparticles (Ni NPs) have been grown in a mesoporous carbon (MC) matrix (MC-Niinsitu) and efficiently catalyze low-temperature hydrogen desorption from Mg(BH4)2. The onset desorption temperature (Tonset) of this MC-Niinsitu-Mg(BH4)2 system is 44 °C compared to 275 °C (Tonset) for pure Mg(BH4)2. This is the lowest value reported for hydrogen desorption from this metal hydride. The activation energy (Ea) of MC-Niinsitu-Mg(BH4)2 was determined to be 21.3 kJ/mol which is less than half the value of 45.9 kJ/mol for pure Mg(BH4)2. We ascribe this reduction to the synergistic effects of nanoconfinement and the homogeneously dispersed, ultrafine Ni NPs active sites in the mesoporous carbon.",

keywords = "Catalysis, Hydrogen storage, Mg(BH), Nanoconfinement, Porous carbon, Synergistic effects",

author = "Wahab, {Mohammad A.} and Young, {David J.} and Azharul Karim and Sabrina Fawzia and Beltramini, {Jorge N.}",

year = "2016",

month = dec,

day = "7",

doi = "10.1016/j.ijhydene.2016.09.098",

language = "English",

volume = "41",

pages = "20573--20582",

journal = "International Journal of Hydrogen Energy",

issn = "0360-3199",

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TY - JOUR

T1 - Low-temperature hydrogen desorption from Mg(BH4)2 catalysed by ultrafine Ni nanoparticles in a mesoporous carbon matrix

AU - Wahab, Mohammad A.

AU - Young, David J.

AU - Karim, Azharul

AU - Fawzia, Sabrina

AU - Beltramini, Jorge N.

PY - 2016/12/7

Y1 - 2016/12/7

N2 - Homogenously dispersed, ultrafine Ni nanoparticles (Ni NPs) have been grown in a mesoporous carbon (MC) matrix (MC-Niinsitu) and efficiently catalyze low-temperature hydrogen desorption from Mg(BH4)2. The onset desorption temperature (Tonset) of this MC-Niinsitu-Mg(BH4)2 system is 44 °C compared to 275 °C (Tonset) for pure Mg(BH4)2. This is the lowest value reported for hydrogen desorption from this metal hydride. The activation energy (Ea) of MC-Niinsitu-Mg(BH4)2 was determined to be 21.3 kJ/mol which is less than half the value of 45.9 kJ/mol for pure Mg(BH4)2. We ascribe this reduction to the synergistic effects of nanoconfinement and the homogeneously dispersed, ultrafine Ni NPs active sites in the mesoporous carbon.

AB - Homogenously dispersed, ultrafine Ni nanoparticles (Ni NPs) have been grown in a mesoporous carbon (MC) matrix (MC-Niinsitu) and efficiently catalyze low-temperature hydrogen desorption from Mg(BH4)2. The onset desorption temperature (Tonset) of this MC-Niinsitu-Mg(BH4)2 system is 44 °C compared to 275 °C (Tonset) for pure Mg(BH4)2. This is the lowest value reported for hydrogen desorption from this metal hydride. The activation energy (Ea) of MC-Niinsitu-Mg(BH4)2 was determined to be 21.3 kJ/mol which is less than half the value of 45.9 kJ/mol for pure Mg(BH4)2. We ascribe this reduction to the synergistic effects of nanoconfinement and the homogeneously dispersed, ultrafine Ni NPs active sites in the mesoporous carbon.

KW - Catalysis

KW - Hydrogen storage

KW - Mg(BH)

KW - Nanoconfinement

KW - Porous carbon

KW - Synergistic effects

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U2 - 10.1016/j.ijhydene.2016.09.098

DO - 10.1016/j.ijhydene.2016.09.098

M3 - Article

AN - SCOPUS:84992436610

VL - 41

SP - 20573

EP - 20582

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

IS - 45

ER -

Low-temperature hydrogen desorption from Mg(BH₄)₂ catalysed by ultrafine Ni nanoparticles in a mesoporous carbon matrix

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