fig2
Figure 2. The TEM and HRTEM images with corresponding SAED images of (A) β-MnO2, (B) R-FexMn1-xO2. (C) corresponding elemental mapping images of R-FexMn1-xO2 powders. TEM: Transmission electron microscopy; HRTEM: high-resolution transmission electron microscopy; SAED: selective area electron diffraction.