fig2

Figure 2. The (A-D) SEM image; (E, F) HRTEM image; (G) HAADF-STEM image and EDS elemental mapping of the Co3S4/rGO-160-8 electrode. SEM: scanning electron microscopy; HRTEM: high-resolution transmission electron microscopy; HAADF-STEM: high-angle annular dark-field scanning transmission electron microscopy; EDS: energy dispersive spectroscopy.