Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 12: Postersitzung (Struktur und Dynamik reiner Oberfl
ächen, Grenzfl
äche fest-flüssig, Nanostrukturen, Teilchen und Cluster, Halbleiteroberfl
ächen und Grenzfl
ächen, Zeitaufgelöste Spektroskopie, Rastersondentechniken, Methodisches)

O 12.8: Poster

Montag, 24. März 2003, 18:00–21:00, P1

In situ FTIR spectroscopy of organic adsorbates on a Pd(111)-electrode — •Katrin Brandt, Elisabeth Vogler, and Klaus Wandelt — Institute of Physical and Theoretical Chemistry, University of Bonn, 53115 Bonn

With the objective of utilizing small organic molecules as No-dqprobesNo-dq for the surface reactivity of electrocatalyticly active, binary electrodes, their adsorption behavior is first investigated on the bare metal surfaces of the respective components.

The adsorption of formic acid has thus been studied on a Pd(111)-electrode in sulfuric acid employing Cyclic Voltammetry, in situ and ex situ Fourier Transform Infrared as well as Auger Electron Spectroscopy.

The spectroscopic characterisation of HCOOH/Pd(111) points to a distinct dependence of the processes at the electrode (adsorption, dissociation) on the applied potential. With this system both the intact formic acid as well as its dissociation product (CO) can be identified on the surface by means of the intensive C=O-stretching vibrations at about 1650 cm−1 and 1900 cm−1. Analysis of the intensity of the bands as a function of the electrode potential provides further information about the decomposition of the organic adsorbate molecules.

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