Aqueous asymmetric supercapacitor based on niobium diselenide
A technology of supercapacitors and niobium diselenide, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double layer capacitors, etc., can solve the problems that limit the wide application of supercapacitors and unsatisfactory electronic conductivity, and achieve good electrical transmission ability, excellent electrochemical performance, and high energy density
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[0025] 1. Preparation of niobium diselenide nanosheets
[0026] Place 50 mg of niobium diselenide powder in 10 mL of a mixture of ethanol and deionized water at a volume ratio of 3:7, in an ice-water bath, sonicate at a power of 50 W for 1 h, and then centrifuge at a speed of 3000 rpm for 30 min to obtain supernatant, to obtain the supernatant containing niobium diselenide nanosheets.
[0027] figure 1 From the transmission electron microscope image of the niobium diselenide nanosheets prepared in this example, it can be seen that the stripped sample exhibits a thinner layered structure.
[0028] figure 2 XPS analysis of the niobium diselenide nanosheets prepared for this example, wherein: (a) corresponds to the XPS spectrum of Nb, and (b) corresponds to the XPS spectrum of Se. The Nb 3d spectral curve reveals that the core level spectrum has four peaks at 203.55, 206.55, 207 and 210.55 eV, corresponding to the Nb 4+ The 3d5 / 2 peaks (ie 203.55, 206.55 and 207eV) can be at...
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