Bismuth oxide/manganese oxide composite supercapacitor and preparation method thereof

A supercapacitor and manganese oxide technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve problems such as reduction or crystal transformation, unstable structure of bismuth oxide, etc., to improve stability and enhance electrochemical Capacitive properties, effects of increased oxygen vacancies and active area

Active Publication Date: 2021-02-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the application of bismuth oxide in the field of supercapacitors has attracted the attention of the industry. However, the structure of a single bismuth oxide is unstable, and it is prone to reduction or crystal transformation. It is necessary to further improve its stability when it is used in capacitors.

Method used

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  • Bismuth oxide/manganese oxide composite supercapacitor and preparation method thereof
  • Bismuth oxide/manganese oxide composite supercapacitor and preparation method thereof
  • Bismuth oxide/manganese oxide composite supercapacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 0.4g of bismuth nitrate, 0.2g of manganese nitrate, and 0.3g of mesoporous silica dissolved in 20ml of absolute ethanol and stir for 3 hours, dry at 30°C for 10h, put the sample into a tube furnace for 3 hours at 500°C for annealing, and then use Wash repeatedly with sodium hydroxide and deionized aqueous solution, centrifuge at last, and dry at 30°C for 10 hours to obtain bismuth oxide / manganese oxide.

[0031] figure 1 It is a scanning electron microscope image of a bismuth oxide / manganese oxide composite supercapacitor. In the figure, the bismuth oxide with a dendritic structure as the main body is covered by a film-like manganese oxide. The film-like manganese oxide increases the specific surface area of ​​the overall structure and increases a lot The active sites and oxygen vacancies effectively improve the electrochemical capacitive performance of the material.

[0032] figure 2 It is the transmission electron microscope (a) and the element distribution m...

Embodiment 2

[0034] Weigh 0.1g of bismuth nitrate, 0.3g of manganese nitrate, 0.1g of mesoporous silica dissolved in 10ml of absolute ethanol and stir for 2 hours, dry at 60°C for 5h, put the sample in a tube furnace for 2 hours at 600°C for annealing, and then use Wash repeatedly with sodium hydroxide and deionized aqueous solution, centrifuge at last, and dry at 60°C for 5 hours to obtain bismuth oxide / manganese oxide.

[0035] image 3 It is the X-ray diffraction pattern of the bismuth oxide / manganese oxide composite supercapacitor, and the test result is consistent with the standard comparison card comparison, indicating that the bismuth oxide and manganese oxide are successfully composited.

[0036] Figure 4 It is the XPS diagram of a bismuth oxide / manganese oxide composite supercapacitor. The full spectrum shows that the composite does contain manganese, oxygen, and bismuth elements. Bi 4f shows two characteristic peaks, which are 4f at 164.1ev 5 / 2 and 4f at 158.8ev 7 / 2 , indicat...

Embodiment 3

[0039] Weigh 1g of bismuth nitrate, 0.5g of manganese nitrate, 1g of mesoporous silica dissolved in 50ml of absolute ethanol and stir for 5 hours, dry at 80°C for 1h, put the sample in a tube furnace for 5 hours at 300°C and anneal for 5 hours, then oxidize with hydrogen Repeated washing with sodium and deionized aqueous solution, centrifugation at last, and drying at 80°C for 1 hour to obtain bismuth oxide / manganese oxide.

[0040] Image 6 It is the cyclic voltammogram of the bismuth oxide / manganese oxide composite supercapacitor, using the composite as the working electrode, the platinum sheet electrode as the counter electrode, and silver / silver chloride as the reference electrode to form a three-electrode system. At 1 mVs in the electrolyte -1 ,10 mV s -1 ,50 mV s -1 ,100 mV s -1All CV curves have a similar shape, and the potential range of the Faraday redox peak is -0.2V to 0.5V. The CV curves shown in the figure have a larger closed area, indicating a higher capaci...

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Abstract

The invention provides a bismuth oxide / manganese oxide composite supercapacitor and a preparation method thereof, and belongs to the technical field of material preparation. According to the invention, mesoporous silica is selected as a template, and bismuth oxide with high ionic conductivity and manganese oxide with high specific capacitance are combined to form the composite supercapacitor withmore excellent electrochemical performance; the prepared supercapacitor has relatively high specific capacitance and energy density on the premise of ensuring the stability of an electrode material; and the preparation method is cheap in required raw materials, simple in process and mild in reaction, and the prepared supercapacitor can be recycled in industry.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a bismuth oxide / manganese oxide composite supercapacitor and a preparation method thereof. Background technique [0002] As an emerging energy storage material in the 21st century, supercapacitors have become an important goal of sustainable energy research due to their small size, high energy, low cost, and long life. However, the high energy density and strong electrochemical stability of the supercapacitors currently prepared have not been well demonstrated and realized due to the limitation of materials, that is, it is difficult to have a relatively stable electrode material under the premise of ensuring stability. High specific capacitance, which hinders the application and development of supercapacitors. [0003] As an abundant element in the earth's crust, manganese has rich physical and chemical properties, and has excellent performance in cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/46H01G11/24
CPCH01G11/86H01G11/46H01G11/24Y02E60/13
Inventor 李海涛储晨刘运亮李亚锡武如强李华明邓沛基
Owner JIANGSU UNIV
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