fig3
![CoFe<sub>2</sub>O<sub>4</sub> nanoparticles as a bifunctional agent on activated porous carbon for battery-type asymmetrical supercapacitor](https://image.oaes.cc/1f76a2c2-e8af-456b-939d-1cb3edbdda22/cs3048.fig.3.jpg)
Figure 3. The SEM images of AC and MACs (×2000), EDX mapping images and TEM images of 140MAC24. SEM: Scanning electron microscopy; AC: activated carbon; MACs: modified activated carbons; EDX: energy dispersive X-ray detector; TEM: transmission electron microscope; 140MAC24: modified activated carbon heated at 140 °C for 24 h.