Figure 2
From: Noble metal-free bifunctional oxygen evolution and oxygen reduction acidic media electro-catalysts
(a) The XRD patterns of amorphous MnO2 and Cu1.5Mn1.5O4:F of different F content in wide angle 2θ scan, (b) The bright field TEM image Cu1.5Mn1.5O4:10F shows the presence of fine particles in the nanometer range (~8–10 nm), (c) 19F MAS NMR spectra of Cu1.5Mn1.5O4:5F, Cu1.5Mn1.5O4:10F and Cu1.5Mn1.5O4:15F; spinning side bands are marked by asterisks.
