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Influence of nitrogen and iron precursors on the synthesis of FeNx/Carbons electrocatalysts toward oxygen reduction reaction in acid solution.
- Source :
-
Electrochimica Acta . Jul2014, Vol. 135, p147-153. 7p. - Publication Year :
- 2014
-
Abstract
- A variety of non-noble electrocatalysts (Fe(III)Nx/C and Fe(II)N6/C) have been fabricated by pyrolyzing nitrogen-rich compounds (ethylenediamine, tetraethylenepetamine and pentaethylenehexamine) and iron precursors (iron(III) chloride and iron(II) ammonium sulphate) on carbon blacks (Vulcan XC-72) in a nitrogen atmosphere. The catalytic performance (activity and durability) toward oxygen reduction reaction (ORR) is comparatively examined by rotating disk electrode and chronoamperometric techniques. The results show that nitrogen precursors play a crucial role on the chemical microstructure and performance of electrocatalysts. The influence of various nitrogen and iron precursors on the properties of electrocatalysts has been analyzed by X-ray based spectroscopies including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and X-ray absorption spectroscopy (XAS). Among all the Fe(III)Nx/C and Fe(II)N6/C catalysts, Fe(III)N6/C catalysts which pentaethylenehexamine and iron(III) chloride are used as starting precursors possess the superior electrocatalytic ORR activity and durability probably due to their higher surface Fe/C and N/C atomic ratios with the pyridinic-N and quaternary-N active sites for the formation of the FeN4 species, as verified by XPS and XAS analyses. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00134686
- Volume :
- 135
- Database :
- Academic Search Index
- Journal :
- Electrochimica Acta
- Publication Type :
- Academic Journal
- Accession number :
- 96896254
- Full Text :
- https://doi.org/10.1016/j.electacta.2014.04.167