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

Pending Publication Date: 2021-07-16
ANHUI UNIVERSITY
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  • Abstract
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Problems solved by technology

However, the electronic conductivity of these materials is unsatisfactory, severely limiting their wide application in supercapacitors

Method used

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  • Aqueous asymmetric supercapacitor based on niobium diselenide
  • Aqueous asymmetric supercapacitor based on niobium diselenide
  • Aqueous asymmetric supercapacitor based on niobium diselenide

Examples

Experimental program
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Embodiment 1

[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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Abstract

The invention discloses an aqueous asymmetric supercapacitor based on niobium diselenide. The aqueous asymmetric supercapacitor takes a niobium diselenide nanosheet as a positive electrode active material. The obtained aqueous asymmetric supercapacitor has the advantages of excellent electrochemical performance, high energy density, good cycling stability and high coulombic efficiency.

Description

technical field [0001] The invention belongs to the field of electronic materials and devices, and in particular relates to an aqueous asymmetric supercapacitor based on niobium diselenide. Background technique [0002] Among all energy storage systems, supercapacitors are the most promising candidates due to their relatively high power, fast charging, good cycling stability, and low maintenance cost. The capacitance of supercapacitors originates from the electric double layer energy storage mechanism of active electrode materials or the faradaic redox-induced pseudocapacitance mechanism. Compared to fuel cells, supercapacitors have a very low energy density. The energy density of supercapacitors can be further improved by developing asymmetric supercapacitors. Under the asymmetric structure configuration, the different voltage windows of the two different electrode materials will maximize the synthesis operation potential window, thereby achieving the effect of increasing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/30H01G11/86
CPCH01G11/24H01G11/30H01G11/86Y02E60/13
Inventor 李国华夏超胡鑫黄辉侯蕊周雪王宁
Owner ANHUI UNIVERSITY
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