Fe-N/C catalysts for oxygen reduction based on silicon carbide derived carbon |
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| Institution: | 1. Institute of Chemistry, University of Tartu, 14a Ravila Str., 50411 Tartu, Estonia;2. Soft Matter and Functional Materials, Helmholtz Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany;3. Institute of Physics, University of Tartu, 1 W. Ostwaldi Str., 50411 Tartu, Estonia;4. Institute of Solid State Physics, University of Latvia, Kengaraga 8, 1063 Riga, Latvia;1. Isotope Laboratory, Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195;2. Center for Earth and Environmental Isotope Research, Department of Geological Sciences, University of Texas at El Paso, El Paso, TX 79968 |
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| Abstract: | Two different Fe-N/C(SiC) catalysts (Fe + Bipyr/C(SiC) and Fe + Phen/C(SiC)) for oxygen reduction based on silicon carbide derived carbon were synthesized and investigated in 0.1 M KOH aqueous solution by rotating disc electrode method. It was found that the electrocatalytic activity and stability are significantly influenced by the change of the nitrogen ligand in the catalyst. Comparable current density values obtained for 20%Pt-Vulcan electrode could be achieved for Fe + Bipyr/C(SiC) and Fe + Phen/C(SiC) catalysts in alkaline media. The durability tests (~ 150 h) showed that the decrease of the activity for Fe + Bipyr/C(SiC) and Fe + Phen/C(SiC) is only 0.5 mV h− 1 and 0.17 mV h− 1, respectively. The Fe + Bipyr/C(SiC) catalyst demonstrated higher activity in the RDE measurements, but during the long-term test the Fe + Phen/C(SiC) catalyst prove to be more stable than Fe + Bipyr/C(SiC). |
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