Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Solid-Liquid Interfaces: Structure, Spectroscopy, Reactions and Electrochemistry

O 60.4: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG2

Tuning oxygen reduction through interface engeneering — •Patrick Alexa1, Doris Grumelli1, Diana Hötger1, Svetlana Klayatskaya2, Mario Ruben2, Rico Gutzler1, and Klaus Kern1,31) Max Planck Institute for Solid State Research, 70569 Stuttgart, Germany — 2Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany — 3Ecole Polytéchnique Fédérale de Lausanne, 1015 Lausanne, Switzerland

Electrocatalytical reactions, especially the oxygen reduction reaction (ORR) in alkaline media, are widely examined. They are of interest for the development of efficient fuel cells and metal-air batteries. Functionally designed catalysts at interfaces are crucial for the improvement of such reactions. The catalytic reactive sites can be metal centers (e.g. Co) incorpotated within organic molecules, e.g. phthalocyanines (Pcs). Here, we study the effect of side groups in Co-phthalocyanines (CoPcs) deposited on Au(111). Deposition of the CoPcs was followed by STM and XPS prior to oxygen reduction in 0.1M NaOH. By increasing the distance between Co atom and Au(111) surface through Pc functionalization with triisopropyl protection groups, the ORR activity is significantly diminished. Thus, a small distance between gold electrode and metal active site is essential for efficient ORR. The results highlight the importance of chemical tailoring of the catalyst interface for the rational design of efficient catalysts.

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