Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 17: Solid-liquid interfaces: Reactions and electrochemisty I (joint session O/CPP)

O 17.1: Vortrag

Montag, 12. März 2018, 15:00–15:15, MA 144

Towards size-selected supported Pd clusters in aqueous environment — •Nicolas Bock, Astrid de Clercq, Clara Rettenmaier, Ueli Heiz, and Friedrich Esch — Chemistry Department & Catalysis Research Center, Technische Universität München, Garching, 85747, Germany

Supported Palladium nanoparticles have been widely investigated as efficient electro- and photo-electro-catalysts. However, for the smaller sub-nanometer Pd clusters, little is known about their size-dependent catalytic properties and stability in aqueous environments. Since this non-scalable size regime bears the potential of high catalytic activity, we aim at finding new ways to prepare and study size-selected Pd clusters via controlled electrochemical decomposition.

To this purpose we have investigated the controlled decomposition of Pd-polyoxo-metalates [1] under specific electrochemical potential and pH conditions, taking advantage of their precise stoichiometry and redox properties. The investigation bases on Electrochemical Scanning Microscopy (ECSTM) and Rotating Disk Electrode (RDE) measurements. Reactivity measurements on single clusters using the STM tip as a microelectrode for hydrogen evolution monitoring are work in progress.

[1] P. Yang, Y. Xiang, Z. Lin, B. S. Bassil, J. Cao, L. Fan, Y. Fan, M.-X. Li, P. Jiménez-Lozano, J. J. Carbó, et al., Angewandte Chemie International Edition 2014, 53, 11974-11978.