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Berlin 2015 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 17: Postersession I

MM 17.19: Poster

Monday, March 16, 2015, 18:00–20:00, Poster E

Thermally induced hydrogen desorption of metal-borohydridesChristoph J. Sahle1, Simon Kujawski2, Arndt Remhof3, Yigang Yan3, Nick Stadie3, Kolja Mende2, Ali Al-Zein1, Simo Huotari4, Metin Tolan2, and •Christian Sternemann21European Synchrotron Radiation Facility, Grenoble, France — 2Fakultät Physik / DELTA, Technische Universität Dortmund, Dortmund, Germany — 3Empa, Hydrogen and Energy, Dübendorf, Switzerland — 4Department of Physics, University of Helsinki, Helsinki, Finland

Complex lightweight hydrides are candidates for efficient reversible hydrogen storage. During dehydrogenation the hydrides decompose into both crystalline and amorphous phases where latter are often difficult to detect. We use x-ray Raman scattering, a bulk sensitive probe of soft x-ray absorption edges, to measure e.g. boron K- and magnesium L-edges both ex-situ and in-situ during decomposition. To clarify possible decomposition pathways, spectra of reference samples are employed to fingerprint intermediate phases via principal component analysis. Results for magnesium and calcium borohydrides will be discussed with focus on the formation of closo-borane species, which could act as a boron sink and hinder cycling.

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