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

Croze, Virginie and Ettingshausen, Frank and Melke, Julia and Soehn, Matthias and Stuermer, Dominic and Roth, Christina (2010):
The use of in situ X-ray absorption spectroscopy in applied fuel cell research.
In: Journal of Applied Electrochemistry, 40 (5), Springer Netherlands, pp. 877-883, ISSN 0021-891X,
[Online-Edition: http://dx.doi.org/10.1007/s10800-009-9919-x],
[Article]

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.

Item Type: Article
Erschienen: 2010
Creators: Croze, Virginie and Ettingshausen, Frank and Melke, Julia and Soehn, Matthias and Stuermer, Dominic and Roth, Christina
Title: The use of in situ X-ray absorption spectroscopy in applied fuel cell research
Language: English
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.

Journal or Publication Title: Journal of Applied Electrochemistry
Volume: 40
Number: 5
Publisher: Springer Netherlands
Uncontrolled Keywords: In situ, Fuel cells, X-ray absorpötion spectroscopy, Spectroelectrochemistry, Operando
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Erneuerbare Energien
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Feb 2013 09:07
Official URL: http://dx.doi.org/10.1007/s10800-009-9919-x
Identification Number: doi:10.1007/s10800-009-9919-x
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