Abstract
In-situ X-ray absorption spectroscopy is an exciting tool which, in contrast to many other characterization techniques, does neither require ultrahigh vacuum conditions, nor long-range order in the material under study. It thus allows us to investigate electrocatalysts directly under operation conditions. With the Δµ XANES difference approach combined with theoretical calculations, characteristic signatures give away the kind of adsorbate on the catalyst surface and its temperature- and potential-dependent coverage. Unraveling reaction and degradation mechanisms in carbon-supported Pt nanoparticle catalysts applied at the anode or cathode side of polymer electrolyte membrane fuel cells, it thus helps to tailor active and stable materials for future energy devices. In this paper, three examples ranging from the investigation of CO adsorption on an oxide-supported Pt catalyst to the detailed study of the anode and cathode catalyst in high-temperature PEM fuel cells will be presented.
Published Version
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