Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.39: Poster
Montag, 26. März 2012, 17:00–19:00, Poster B
Coating Nanoporous Gold by pulsed electrodeposition — •Tobias Kitzler1, Jürgen Markmann1,2, and Jörg Weissmüller1,2 — 1Helmholtz-Zentrum Geesthacht, Germany — 2Technische Universität Hamburg-Harburg, Germany
Over the last two decades nanoporous metals produced by selective dealloying have attracted lots of attention. Due to their enormous surface to weight ratio they exhibit outstanding electrochemical properties with respect to their mass/volume. Recently nanoporous materials became more and more interesting for battery applications not only due to their electrochemical properties, but also due to their elastic properties, i.e. the extended elastic range which might be helpful with respect to the cycle stability of the electrodes. To make the nanoporous metal applicable for different usages, e.g. Li storage, it would be interesting to produce nanoporous metals with a coated surface. Successful attempts of such a synthesis were usually limited to very thin coatings or even monolayers.
This work is about the synthesis of nanoporous Au coated with Sn by electrodeposition. The deposition of more than a monolayer is a challenging task. This probably is caused by the low mass transfer rate into the bulk of a nanoporous sample by the electrolyte. In order to circumvent those difficulties, a pulsed electrodeposition method under a continous electrolyte flow is used. By this method, the electrolyte inside the nanoporous metal is exchanged after each pulse. The samples then were characterised by SEM and EDX and the influence of the system parameters on the electrodeposition process was investigated.