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NaBX4-MgX2 Composites (X= D,H) Investigated by In situ Neutron Diffraction

Published online by Cambridge University Press:  01 February 2011

Daphiny Pottmaier ,
Sebastiano Garroni ,
Michela Brunelli ,
Gavin B. M. Vaughan ,
Alberto Castellero ,
Enric Menéndez ,
Maria Dolors Baró  and
Marcello Baricco
Daphiny Pottmaier
Affiliation:
[email protected]@unito.it
Sebastiano Garroni
Affiliation:
[email protected], UAB, Fisica, Barcelona, Spain
Michela Brunelli
Affiliation:
[email protected], ILL, D20, Grenoble, France
Gavin B. M. Vaughan
Affiliation:
[email protected], ESRF, ID11, Grenoble, France
Alberto Castellero
Affiliation:
[email protected], UNITO, Chimica IFM NIS, Turin, Italy
Enric Menéndez
Affiliation:
[email protected], UAB, Fisica, Barcelona, Spain
Maria Dolors Baró
Affiliation:
[email protected], UAB, Fisica, Barcelona, Spain
Marcello Baricco
Affiliation:
[email protected], UNITO, Chimica IFM NIS, Turin, Italy
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Abstract

Light element complex hydrides (e.g. NaBH4) together with metal hydrides (e.g. MgH2) are considered two primary classes of solid state hydrogen storage materials. In spite of drawbacks such as unfavourable thermodynamics and poor kinetics, enhancements may occur in reactive hydride composites by nanostructuring of reactant phases and formation of more stable product phases (e.g. MgB2) which lower overall reaction enthalpy and allow reversibility. One potential system is based on mixing NaBH4 and MgH2 and subsequent ball milling, which in a 2:1 molar ratio can store considerable amounts of hydrogen by weight (up to 7.8 wt%). A study of the 2NaBX4 + MgX2 → MgB2 + 2NaX + 4X2 (X=D,H) reaction is assessed by means of in-situ neutron diffraction with different combinations of hydrogen and deuterium on the X position. The desorption is established to begin at temperatures as low as 250 °C, starting with decomposition of nanostructured MgX2 due to joint effects of nanostructured MgX2 and its reducing effect at NaBX4. Analyses of background profile, due to the high incoherent neutron scattering of hydrogen, as a function of temperature demonstrate direct correlation of H/D desorption reactions with relative phases amount.

Keywords

neutron irradiationenergy storagereactive ball milling
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1262: Symposium V/W – In-Situ and operando Probing of Energy Materials at Multiscale Down to Single Atomic Couumn-The Powerof X-Rays, Neutons and Electrons Microscopy , 2010 , 1262-W03-04
Copyright
Copyright © Materials Research Society 2010

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