Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry

O 45.12: Poster

Dienstag, 13. März 2018, 18:15–20:30, Poster A

Deposition and reactivity of single Pd clusters at solid-liquid interfaces — •Clara Rettenmaier, Nicolas Bock, Astrid De Clercq, Ueli Heiz, and Friedrich Esch — Chemistry Department & Catalysis Research Center, Technische Universität München, Garching, 85747, Germany

Electrochemical deposition of Pd monolayers on Au(111) have been studied extensively [1]. Palladium shows high catalytic activities for many chemical reactions and is capable to absorb hydrogen. In particular, submonolayer coverages show significant electrocatalytic enhancement for the hydrogen evolution reaction (HER) [2]. However, size-selected Pd clusters in the non-scalable size regime have barely been studied in aqueous environments, despite their potential for high catalytic activities.

We present the preparation of single size Pd clusters on Au(111) by decomposition of polyoxometalates [3] under controlled electrochemical potential and pH. The clusters are characterized by Electrochemical Scanning Tunneling Microscopy (ECSTM) and Rotating Disc Electrode (RDE) measurements, while the HER activity of single clusters is measured in situ using the STM tip as a microelectrode.

[1] Kibler, L. A., El-Aziz, A. M., Kolb, D. M., Journal of Molecular Catalysis A 2003, 199(1), 57-63.

[2] Pandelov, S., Stimming, U., Electrochimica Acta 2007, 52(18), 5548-5555.

[3] Yang, P., Kortz, U. et al., Angewandte Chemie International Edition 2014, 53, 11974-11978.