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Preparation method of polysulfide/iodine liquid flow battery electrode based on COS2-CoS n-n semiconductor junctions

A cos2-cosn-n, semiconductor technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of increased charge-discharge potential difference, side reactions of hydrogen evolution, and reduced current density, achieving high crystallinity, Low production cost and improved electrical conductivity

Active Publication Date: 2019-09-10
SHANGHAI JIAO TONG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the electrochemical process, the polarization of the oxidation-reduction reaction on the electrode surface leads to an increase in charge-discharge potential difference, a decrease in current density, and side reactions of oxygen and hydrogen evolution, which affect the energy density, power density and energy storage efficiency of the battery.

Method used

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  • Preparation method of polysulfide/iodine liquid flow battery electrode based on COS2-CoS n-n semiconductor junctions
  • Preparation method of polysulfide/iodine liquid flow battery electrode based on COS2-CoS n-n semiconductor junctions
  • Preparation method of polysulfide/iodine liquid flow battery electrode based on COS2-CoS n-n semiconductor junctions

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Embodiment 1

[0040] A CoS-based 2 -CoS n-n semiconductor junction polysulfide / iodine flow battery electrode preparation method:

[0041] (1) Using a one-step solvothermal method, 1mmol CoSO 4 ·7H 2 O, 10mmol urea and 25mmol sublimated sulfur were added to 70mL of a mixed solvent of ethylene glycol and N,N-dimethylformamide, the volume ratio of ethylene glycol and N,N-dimethylformamide was 0.9, and stirred at room temperature 1 hour;

[0042] (2) Transfer it to a 100mL autoclave and react at 180°C for 12h;

[0043] (3) After the reaction is finished, cool to room temperature, obtain the precipitate obtained by centrifugation at a speed of 7000rpm for 5min, wash the product twice with deionized water and once with absolute ethanol, and then dry the product under vacuum at 60°C for 6h, namely get black CoS 2 / CoS powder product. CoS was synthesized by a similar method 2 and CoS, adjust the volume ratio of ethylene glycol and N,N-dimethylformamide to 0.5 and 2, respectively, and stir at...

Embodiment 2

[0050] According to the method of embodiment 1, difference is that metal cobalt salt used is cobalt nitrate.

Embodiment 3

[0052] According to the method of embodiment 1, difference is that metal cobalt salt used is cobalt oxide.

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Abstract

The invention relates to a preparation method of a polysulfide / iodine liquid flow battery electrode based on COS2-CoS n-n semiconductor junctions, which includes the following steps: adding metal cobalt salt, urea and a sulfur source into a mixed solvent of ethylene glycol and N, N-dimethylformamide; stirring the substances at room temperature; making the substances react at high temperature; cooling the reaction kettle to room temperature and carrying out centrifugal separation after reaction to obtain products; and washing the products and drying the products in vacuum to obtain black COS2,CoS2 / CoS and COS powdered products. Compared with the prior art, the electrode has high crystallinity, the construction of n-n junctions can promote the transfer of interface charges, improve the conductivity of the material, reduce polarization and improve the reversibility of catalytic performance of the material, and therefore, the electrode has high catalytic performance and good cyclic stability.

Description

technical field [0001] The invention belongs to the field of new energy materials research, in particular to a CoS-based 2 -CoS n-n semiconductor junction polysulfide / iodine flow battery electrode preparation method. Background technique [0002] A flow battery is a device that converts chemical energy stored in different ion valence states in an electrolyte into electrical energy. Through the function of an external pump, the electrolyte is continuously reciprocated and pressed into the battery stack for reaction, so that it flows in different storage tanks. The proton exchange membrane is used as the diaphragm of the battery, and the electrolyte containing redox pairs flows in parallel across the electrode surface and undergoes an oxidation reaction, and electrons are collected and transferred through the current collector to convert chemical energy into electrical energy. Polysulfur / iodine flow batteries are based on S 2- / S x 2- and I - / I 3 - The solution of the...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/8652H01M4/88H01M4/8825Y02E60/50
Inventor 宰建陶马对戚嵘嵘钱雪峰何凯闫昶宇田恒陈明郭姣姣刘雪娇张寓弛
Owner SHANGHAI JIAO TONG UNIV
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