fig1

Figure 1. Material characterizations of the CoFe PBA/CF sample. (A and B) SEM, (C) HRTEM images, and (D) EDX mapping; (E and F) SEM, (G) HRTEM images, and (H) EDX mapping after reconstruction in KOH solution; (I) XRD pattern and (J and K) XPS spectra of Co 2p and Fe 2p for CoFe PBA/CF and CoFe PBA-CF samples before and after reconstruction in KOH solution. CoFe PBA/CF: Cu-supported CoFe Prussian blue analogue; SEM: scanning electron microscopy; HRTEM: high-resolution transmission electron microscope; EDX: energy-dispersive X-ray spectroscopy; XRD: X-ray powder diffraction; XPS: X-ray photoelectron spectroscopy.