Berlin 2012 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Session
MM 17.54: Poster
Montag, 26. März 2012, 17:00–19:00, Poster B
Gas diffusion electrode development using femtosecond-laser induced microstructured metal surfaces with hydrophobic features — Andreas Gabler1, Anna-Lena Baumann1, Thomas Gimpel2, Stefan Kontermann1, Robert Hahn3, and •Wolfgang Schade1,2 — 1Fraunhofer Heinrich-Hertz-Institute, EnergieCampus, 38640 Goslar — 2Clausthal University of Technology, EFZN, EnergieCampus, 38640 Goslar — 3Fraunhofer Institute for Reliability and Microintegration, IZM, 13355 Berlin
At present, hydrophobic characteristics of gas diffusion electrodes are mostly generated by using polytetrafluoroethylene-materials (PTFE).
An innovative, methodic approach of directly generating new hydrophobic metal surfaces is developed by using femtosecond-laser induced microstructures through ablation, similar to the so called Black Silicon Material.
Its characteristic appearance is a spike-structure at micrometer level, in which superhydrophobic characteristics have already been successfully achieved. Preliminary analyses examined the good usability of the fs-laserprocess in cases of surface structuring on different metals.
The direct generation of microstructured metal surfaces with hydrophobic characteristics for gas diffusion electrodes has the advantage of being a one-material-system with the combined features of hydrophobicity, electrical conductivity und large catalyst surface at a three phase boundary .
In this case, different process settings were made and the resulting surface structures and hydrophobic characteristics compared.