Fe local structure in Pt-free nitrogen-modified carbon based electrocatalysts: XAFS study

The paper presents a new results on the bonding environment (coordination number and geometry) and on oxidation states of Fe in nitrogen-modified Fe C composites used as Pt-free catalysts for oxygen reduction in Direct Hydrogen Fuel Cells. Starting from glucose or fructose, two catalysts displaying...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 712; no. 1; pp. 12131 - 12134
Main Authors Witkowska, Agnieszka, Giuli, Gabriele, Renzi, Marco, Marzorati, Stefania, Yiming, Wubulikasimu, Nobili, Francesco, Longhi, Mariangela
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.05.2016
Subjects
Catalysts
Coordination numbers
Electrocatalysts
Electrochemical analysis
Fuel cells
Hydrogen fuels
Oxidation
Physics
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Summary:The paper presents a new results on the bonding environment (coordination number and geometry) and on oxidation states of Fe in nitrogen-modified Fe C composites used as Pt-free catalysts for oxygen reduction in Direct Hydrogen Fuel Cells. Starting from glucose or fructose, two catalysts displaying different electrochemical performance were prepared and studied in the form of pristine powder and thin catalytic layer of electrode by Fe K-edge XAFS spectroscopy. The results show how the Fe local structure varies as a function of different synthesis conditions and how changes in the structural properties of the catalysts are related to fuel cell electrochemical performance increase during a cell activation period.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/712/1/012131