17. Jan. 2011, 17:00 Uhr, Gebäude NW1, Raum NW 2, Block C, Hörsaal 2, Leobener Straße
The Importance of Nanotechnology in Energy Conversion
Prof. dr. Ulrich Stimming, TU München
Recent advances in electrochemistry show that nanoparticles, nanostructured surfaces and bimetallic systems can have modified catalytic activities compared to bulk materials. This can be advantageous for various applications in electrochemical energy conversion.
Previous work on model surfaces such as Pd decorated Au(111) and Pt decorated Au(111) surfaces showed that by decreasing the amount of Pd or Pt on Au(111), the activity for hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR) increases[1-4]. Two experimental approaches were pursued: Firstly, the decoration of Au(111) single crystals surfaces with Pd and Pt via electrodeposition to investigate monolayers and submonolayers of Pd and Pt[1-3]. Secondly, the creation of single Pd and Pt particles with the tip of an EC-STM whereas the tip was also used as a local sensor to determine the reactivity of the single particles[3, 4].
A possible explanation of this increase can be attributed to an effect of the substrate material due to s