Catalysis Letters, Vol.149, No.7, 1903-1910, 2019
Hierarchically Porous MgMn2O4 Microspheres Assembled with Nanosheets as High Oxygen Reduction Catalyst
In this paper, hierarchically porous MgMn2O4 microspheres, which assembled with average size of about 30nm nanosheets, have been synthesized by a facile solvothermal process followed by calcination method. The electrocatalytic properties of the products towords oxygen reduction reaction (ORR) are further investigated. Benefitting from its unique structural characteristics, the hierarchically porous MgMn2O4 microspheres exhibit more positive onset potential and enhanced current density than the MgMn2O4 blocks and irregular sheets, and their ORR catalytic performance is better than the pure manganese oxide (Mn2O3) which is prepared through the same method. In addition, the MgMn2O4 microspheres own superior durability and methanol tolerance than that of Pt/C catalysts in spite of slight negative onset potential, which can be a promising non-noble metal ORR catalyst.Graphical AbstractLSV curves measured at 1600rpm in O-2-saturated 0.1M KOH electrolyte with a scan rate of 5mVs(-1). And the inset image is SEM and TEM with different magnification of hierarchically porous MgMn2O4 microspheres. [GRAPHICS] .