Dresden 2014 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 18: Poster Session
MM 18.6: Poster
Montag, 31. März 2014, 18:00–20:00, P4
In-situ TEM studies of nanostructured Mg based hydrides at elevated hydrogen pressures of 1 bar — •Alexander Surrey1,2, Ludwig Schultz1,2, and Bernd Rellinghaus1 — 1IFW Dresden, Institute for Metallic Materials, P.O. Box 270116, D-01171 Dresden, Germany — 2TU Dresden, Institut fur Festkörperphysik, D-01062 Dresden, Germany
In the search of materials that are potentially applicable as solid-state hydrogen storage materials in the mobile and stationary sector, MgH2 is considered one of the most promising hydrides due to both its relatively high gravimetric storage density of 7.7 wt.-% and its high abundance. However, the thermodynamic and kinetic properties of intrinsic MgH2 impede a practical application. Here, nanostructured hydrides have been shown to reveal improved (de)hydrogenation properties. During structural characterization utilizing conventional TEM, however, MgH2 degrades fast upon the irradiation with the imaging electron beam due to radiolysis in vacuum and as a consequence, the hydride phase cannot be studied at highest resolution. To overcome this problem we explore the possibility to investigate Mg based hydrides by in-situ TEM at elevated H2 pressures (1 bar) and temperatures (up to 300oC) using a so called nanoreactor that was recently developed by Henny Zandbergen at the TU Delft. This allows to study the dehydrogenation as well as the hydrogenation reaction at the nanoscale under working conditions. We present multi-slice HRTEM contrast simulations to show the possibilities and limitations of this new nanoreactor. Such simulations may be valuable to pre-evaluate future experiments.