Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Development of a novel experimental DEMS set-up for electrocatalyst characterization under working conditions of high temperature polymer electrolyte fuel cells

: Niether, C.; Rau, M.S.; Cremers, C.; Jones, D.J.; Pinkwart, K.; Tübke, J.


Journal of electroanalytical chemistry 747 (2015), S.97-103
ISSN: 0368-1874
ISSN: 0022-0728
ISSN: 1572-6657
Fraunhofer ICT ()

A new set-up for conducting differential electrochemical mass spectroscopy (DEMS) analysis at temperatures between 120 and 180 °C is presented. It enables the characterization and testing of model electrodes in a three electrode assembly under experimental conditions close to those in a high temperature proton exchange membrane fuel cell (HT-PEMFC). This is of special interest for the study of the degradation of fuel cell materials as well as the electro-oxidation reactions of small organic molecules used in direct alcohol fuel cells (DAFCs). While other DEMS set-ups only allow for studying reactions occurring in a liquid electrolyte, the HT-DEMS set-up makes it possible to study reactions in the gas phase. The design of the set-up is presented. Cyclic voltammetry (CV) measurements at 150 °C were carried out on Pt/C and Pt black catalysts under nitrogen atmosphere. Oxidation of adsorbed CO and bulk oxidation of ethanol were performed on Pt/C.