Fe-N/C catalysts for oxygen reduction based on silicon carbide derived carbon

Kasatkin, P. E.; Jäger, Rutha; Härk, Eneli; Teppor, Patrick; Tallo, Indrek; Joost, Urmas; Šmits, Krišjanis; Kanarbik, Rait; Lust, Enn I.

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Author

Kasatkin, P. E.

Jäger, Rutha

Härk, Eneli

Teppor, Patrick

Tallo, Indrek

Joost, Urmas

Šmits, Krišjanis

Kanarbik, Rait

Lust, Enn I.

Date

2017

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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).