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Monodisperse MxFe3–xO4 (M = Fe, Cu, Co, Mn) Nanoparticles and Their Electrocatalysis for Oxygen Reduction Reaction

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journal contribution
posted on 12.06.2013, 00:00 by Huiyuan Zhu, Sen Zhang, Yu-Xi Huang, Liheng Wu, Shouheng Sun
Sub-10 nm nanoparticles (NPs) of M­(II)-substituted magnetite MxFe3–xO4 (MxFe1–xO•Fe2O3) (M = Mn, Fe, Co, Cu) were synthesized and studied as electrocatalysts for oxygen reduction reaction (ORR) in 0.1 M KOH solution. Loaded on commercial carbon support, these MxFe3–xO4 NPs showed the M­(II)-dependent ORR catalytic activities with MnxFe3–xO4 being the most active followed by CoxFe3–xO4, CuxFe3–xO4, and Fe3O4. The ORR activity of the MnxFe3–xO4 was further tuned by controlling x and MnFe2O4 NPs were found to be as efficient as the commercial Pt in catalyzing ORR. The MnFe2O4 NPs represent a new class of highly efficient non-Pt catalyst for ORR in alkaline media.