Figure 5: Sodium-ion intercalation mechanism in InHCF. | Nature Communications

Figure 5: Sodium-ion intercalation mechanism in InHCF.

From: Water-mediated cation intercalation of open-framework indium hexacyanoferrate with high voltage and fast kinetics

Figure 5

(a–c) Ex situ XPS spectra recorded from Fe 2p, In 3d and Na 1s core level of InHCF/Gr upon electrochemical cycling (a–g states as shown in e are selected). A binding energy of 688.2 eV for the F 1s (from polyvinylidene fluoride (PVDF)) was used as reference. The peaks labelled by * symbol (705.0±0.1 eV) are related to In 3p1/2. (d) Ex situ X-ray diffraction patterns of InHCF/Gr with cycling. (e) Changes of lattice parameter (a), surface atomic ratio (Na/Fe and In/Fe) in InHCF/Gr during electrochemical cycling. a, 0.55 V, b, 1.02 V, c, 1.035 V, d, 1.2 V, e, 0.975 V, f, 0.945 V and g, 0.3 V seven states are selected for comparison.

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