Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
Nano Lett. 2013 Jun 12;13(6):2947-51. doi: 10.1021/nl401325u. Epub 2013 May 9.
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.
亚 10nm 纳米粒子（NPs）的 M(II)取代磁铁矿 MxFe3-xO4（MxFe1-xO•Fe2O3）（M = Mn，Fe，Co，Cu）被合成并研究作为在 0.1 M KOH 溶液中氧还原反应（ORR）的电催化剂。负载在商业碳载体上，这些 MxFe3-xO4 NPs 表现出与 M(II)相关的 ORR 催化活性，其中 MnxFe3-xO4 的活性最高，其次是 CoxFe3-xO4、CuxFe3-xO4 和 Fe3O4。通过控制 x 值进一步调整了 MnxFe3-xO4 的 ORR 活性，发现 MnFe2O4 NPs 在催化 ORR 方面与商业 Pt 一样高效。MnFe2O4 NPs 代表了一类在碱性介质中具有高效的非 Pt 催化剂。
