fig5
![Enhanced all-climate sodium-ion batteries performance in a low-defect and Na-enriched Prussian blue analogue cathode by nickel substitution](https://image.oaes.cc/9959e570-1a9a-4e1b-b4b7-6c608b92e083/5397.fig.5.jpg)
Figure 5. Sodium storage mechanism at -30 °C. (A and D) Ex-situ XRD patterns. (B and E) Ex-situ XPS Co 2p spectra and (C and F) Ex-situ XPS Fe 2p of Co0.7Ni0.3HCF and CoHCF at different redox states including as-prepared electrodes (Co0.7Ni0.3HCF/CoHCF-Pristine), electrodes charged to 4.2 V (Co0.7Ni0.3HCF/CoHCF-Charged) and electrodes charged to 4.2 V and then discharged to 2.0 V (Co0.7Ni0.3HCF/