Fig. 1. Schematic illustration for preparation of a NiPB/GO composite solution
Fig. 3. Raman spectra (a) and XRD patterns (b) of GO, NiPB, and NiPB/GO. SEM (c) and TEM (d) images of NiPB/GO; the inset of (d) shows the selected area electron diffraction pattern of NiPB/GO.
Fig. 4. CVs of NiPB and NiPB/GO in 1 M NaNO3 electrolyte at a scan rate of 50 mV·s-1 (a), CVs of NiPB/GO in various electrolytes (1 M of LiNO3, NaNO3, KNO3, and CsNO3) at a scan rate of 5 mV·s-1 (b), and mixture solutions of 0.1 M Na+ and different concentrations of Cs+ at a scan rate of 5 mV·s-1 (c).
Fig. 5. Normalized capacity of the NiPB- and NiPB/GO-modified electrodes during CV measurements for 1500 cycles (in 1 M of NaNO3; potential range: 0-1 V; scan rate: 100 mV·s-1) (a), CVs of electrochemically treated NiPB/GO (NiPB/GOA) in 1 M of alkali electrolytes at a scan rate of 5 mV·s-1 (b), and comparison of CVs of NiPB/GO (black solid) and NiPB/ GO-A (red dash) in 1 M of CsNO3 at 5 mV·s-1 (c).
Fig. 2. Schematic illustration of electrochemical reversible intercalation/deintercalation process of alkali metal ions at NiPB.
Table 1. Half-potentials and charge densities of NiPB/GO and NiPB/GO-A modified electrode in various electrolytes
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