In situ neutron diffraction study on Pd-doped Mg{sub 0.65}Sc{sub 0.35} electrode material

Journal Article · Thu May 15 04:00:00 EDT 2008 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2008.02.013· OSTI ID:21128292

Kalisvaart, W P ^[1]; Cuevas, F ^[2]; Notten, P H.L. ^[1]

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1. Eindhoven University of Technology, 5600 MB Eindhoven (Netherlands)
2. Chimie Metallurgique des Terres Rares-ICMPE-UMR7182-CNRS, 2-8 rue Henri Dunant, 94320 Thiais Cedex (France)

The behavior of a negative composite electrode made of Pd-doped Mg{sub 0.65}Sc{sub 0.35} active material has been studied dynamically by in situ neutron diffraction during a complete charge-discharge electrochemical cycle starting from a virgin alloy. From the analysis of the collected diffraction patterns, phase identification, phase amounts, structural changes and cell volume evolutions have been determined as a function of the electrochemical state of (dis)charge. For the first charge, the active material shows a structural transformation from body-centered cubic (bcc) to face-centered cubic (fcc). During the following discharge, a two-phase behavior with equilibrium between a hydrogen-poor fcc phase and a hydrogen-rich one is observed. Complete discharge beyond the hydrogen-poor phase was not reached and a good electrochemical reversibility is expected between the hydrogen-poor and the hydrogen-rich fcc phases for this electrode material. - Graphical abstract: 2D projection of the neutron diffraction pattern intensities as function of time during electrochemical charge of Pd-doped Mg{sub 0.65}Sc{sub 0.35} active material showing the progressive transformation from bcc to fcc.

• OSTI ID: 21128292
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 181; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
BCC LATTICES
CRYSTAL-PHASE TRANSFORMATIONS
DOPED MATERIALS
ELECTROCHEMISTRY
EQUILIBRIUM
FCC LATTICES
HYDROGEN
MAGNESIUM ALLOYS
NEUTRON DIFFRACTION
PALLADIUM ALLOYS
SCANDIUM ALLOYS