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  4. The use of in situ X-ray absorption spectroscopy in applied fuel cell research
 
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2010
Journal Article
Title

The use of in situ X-ray absorption spectroscopy in applied fuel cell research

Abstract
For a detailed understanding and systematic optimization of fuel cell systems, in situ studies are an indispensable tool, as they provide information on the catalyst structure in different operation conditions. X-ray absorption spectroscopy (XAS) is in particular suitable for operando investigations, since it does not require ultra high vacuum conditions or long-range order in the sample. Furthermore, it provides in situ information on oxidation state, adsorbed species and catalyst structure, and thus complements ex situ information, e.g. from X-ray diffraction (structure), X-ray photoelectron spectroscopy (oxidation state) and FTIR (adsorbates) nicely. In a spectroelectrochemistry experiment, XAS can be combined with different electrochemical techniques in order to satisfy different needs and scientific aims. Spectra of both a Pt-Ru anode catalyst and a Pt-Co cathode catalyst were recorded at different potentials, while measuring the current-potential characteristics of a single cell. So-called half-cell measurements, where the former fuel cell cathode was used with hydrogen as the reference electrode, were performed in water and ethanol to obtain a more detailed mechanistic insight into the ethanol electrooxidation. From a more industrial point of view, different catalysts were tested with a fast potential cycling protocol simulating rapid load changes in a vehicle.
Author(s)
Croze, V.
Ettingshausen, F.
Melke, Julia
Söhn, M.
Stürmer, D.
Roth, C.
Journal
Journal of Applied Electrochemistry  
DOI
10.1007/s10800-009-9919-x
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Energietechnik

  • Wasserstoff- und Brennstoffzellentechnologie

  • Wasserstofftechnologie

  • Brennstoffzellensysteme

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