A novel catalytic route for hydrogenation-dehydrogenation of 2LiH + MgB2via in situ formed core-shell LixTiO2 nanoparticlesElectronic supplementary information (ESI) available. See DOI: 10.1039/c7ta03117c
Aiming to improve the hydrogen storage properties of 2LiH + MgB 2 (Li-RHC), the effect of TiO 2 addition to Li-RHC is investigated. The presence of TiO 2 leads to the in situ formation of core-shell Li x TiO 2 nanoparticles during milling and upon heating. These nanoparticles markedly enhance the hy...
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Format | Journal Article |
Language | English |
Published |
27.06.2017
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Abstract | Aiming to improve the hydrogen storage properties of 2LiH + MgB
2
(Li-RHC), the effect of TiO
2
addition to Li-RHC is investigated. The presence of TiO
2
leads to the
in situ
formation of core-shell Li
x
TiO
2
nanoparticles during milling and upon heating. These nanoparticles markedly enhance the hydrogen storage properties of Li-RHC. Throughout hydrogenation-dehydrogenation cycling at 400 °C a 1 mol% TiO
2
doped Li-RHC material shows sustainable hydrogen capacity of ∼10 wt% and short hydrogenation and dehydrogenation times of just 25 and 50 minutes, respectively. The
in situ
formed core-shell Li
x
TiO
2
nanoparticles confer proper microstructural refinement to the Li-RHC, thus preventing the material's agglomeration upon cycling. An analysis of the kinetic mechanisms shows that the presence of the core-shell Li
x
TiO
2
nanoparticles accelerates the one-dimensional interface-controlled mechanism during hydrogenation owing to the high Li
+
mobility through the Li
x
TiO
2
lattice. Upon dehydrogenation, the
in situ
formed core-shell Li
x
TiO
2
nanoparticles do not modify the dehydrogenation thermodynamic properties of the Li-RHC itself. A new approach by the combination of two kinetic models evidences that the activation energy of both MgH
2
decomposition and MgB
2
formation is reduced. These improvements are due to a novel catalytic mechanism
via
Li
+
source/sink reversible reactions.
Aiming to improve the hydrogen storage properties of 2LiH + MgB
2
(Li-RHC), the effect of the
in situ
formed and low cost Li
x
TiO
2
is investigated. |
---|---|
AbstractList | Aiming to improve the hydrogen storage properties of 2LiH + MgB
2
(Li-RHC), the effect of TiO
2
addition to Li-RHC is investigated. The presence of TiO
2
leads to the
in situ
formation of core-shell Li
x
TiO
2
nanoparticles during milling and upon heating. These nanoparticles markedly enhance the hydrogen storage properties of Li-RHC. Throughout hydrogenation-dehydrogenation cycling at 400 °C a 1 mol% TiO
2
doped Li-RHC material shows sustainable hydrogen capacity of ∼10 wt% and short hydrogenation and dehydrogenation times of just 25 and 50 minutes, respectively. The
in situ
formed core-shell Li
x
TiO
2
nanoparticles confer proper microstructural refinement to the Li-RHC, thus preventing the material's agglomeration upon cycling. An analysis of the kinetic mechanisms shows that the presence of the core-shell Li
x
TiO
2
nanoparticles accelerates the one-dimensional interface-controlled mechanism during hydrogenation owing to the high Li
+
mobility through the Li
x
TiO
2
lattice. Upon dehydrogenation, the
in situ
formed core-shell Li
x
TiO
2
nanoparticles do not modify the dehydrogenation thermodynamic properties of the Li-RHC itself. A new approach by the combination of two kinetic models evidences that the activation energy of both MgH
2
decomposition and MgB
2
formation is reduced. These improvements are due to a novel catalytic mechanism
via
Li
+
source/sink reversible reactions.
Aiming to improve the hydrogen storage properties of 2LiH + MgB
2
(Li-RHC), the effect of the
in situ
formed and low cost Li
x
TiO
2
is investigated. |
Author | Gennari, F. C Pistidda, C Mizrahi, M Bellosta von Colbe, J. M Hoell, A Karimi, F Ramallo-López, J. M Larochette, P. Arneodo Santoru, A Klassen, T Puszkiel, J. A Dornheim, M Castro Riglos, M. V |
AuthorAffiliation | Centro Atómico Bariloche Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas Department of Physicochemistry of Materials Helmholtz-Zentrum Berlin Helmut Schmidt University Department of Metalphysics Institute for Nanospectroscopy Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) Helmholtz-Zentrum Geesthacht INIFTA (CCT La Plata - CONICET, UNLP) Department of Nanotechnology Institute of Materials Research |
AuthorAffiliation_xml | – name: Department of Metalphysics – name: Institute for Nanospectroscopy – name: Helmut Schmidt University – name: INIFTA (CCT La Plata - CONICET, UNLP) – name: Centro Atómico Bariloche – name: Department of Physicochemistry of Materials – name: Institute of Materials Research – name: Helmholtz-Zentrum Geesthacht – name: Helmholtz-Zentrum Berlin – name: Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) – name: Department of Nanotechnology – name: Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas |
Author_xml | – sequence: 1 givenname: J. A surname: Puszkiel fullname: Puszkiel, J. A – sequence: 2 givenname: M. V surname: Castro Riglos fullname: Castro Riglos, M. V – sequence: 3 givenname: J. M surname: Ramallo-López fullname: Ramallo-López, J. M – sequence: 4 givenname: M surname: Mizrahi fullname: Mizrahi, M – sequence: 5 givenname: F surname: Karimi fullname: Karimi, F – sequence: 6 givenname: A surname: Santoru fullname: Santoru, A – sequence: 7 givenname: A surname: Hoell fullname: Hoell, A – sequence: 8 givenname: F. C surname: Gennari fullname: Gennari, F. C – sequence: 9 givenname: P. Arneodo surname: Larochette fullname: Larochette, P. Arneodo – sequence: 10 givenname: C surname: Pistidda fullname: Pistidda, C – sequence: 11 givenname: T surname: Klassen fullname: Klassen, T – sequence: 12 givenname: J. M surname: Bellosta von Colbe fullname: Bellosta von Colbe, J. M – sequence: 13 givenname: M surname: Dornheim fullname: Dornheim, M |
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2
(Li-RHC), the effect of TiO
2
addition to Li-RHC is investigated. The presence of TiO
2
leads... |
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Title | A novel catalytic route for hydrogenation-dehydrogenation of 2LiH + MgB2via in situ formed core-shell LixTiO2 nanoparticlesElectronic supplementary information (ESI) available. See DOI: 10.1039/c7ta03117c |
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