Synthesis method of electrode material cobalt tungstate for supercapacitor

A technology for supercapacitors and electrode materials, applied in hybrid capacitor electrodes, chemical instruments and methods, cobalt compounds, etc., can solve the problems of complex preparation process, long reaction time, cumbersome process, etc., and achieve simple synthesis method, low cost of raw materials, The effect of improving capacitor performance

Inactive Publication Date: 2020-02-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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Problems solved by technology

The preparation methods of cobalt tungstate include solvothermal method, hydrothermal method, co-precipitation method, microemulsion method, etc. Currently, there are many known shapes of cobalt tungstate, such as cobalt tungstate nanorods, nanospheres and cockscomb Although the preparation of nano-rod-shaped materials is by chemical precipitation, the preparation process is more complicated and the process is more cumbersome, while the cockscomb-shaped electrode material reacts under hydrothermal conditions, the reaction time is longer and it is carried out in a reactor, which may cause There is a security issue

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  • Synthesis method of electrode material cobalt tungstate for supercapacitor
  • Synthesis method of electrode material cobalt tungstate for supercapacitor
  • Synthesis method of electrode material cobalt tungstate for supercapacitor

Examples

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preparation example 1

[0036] In the synthetic method of the electrode material cobalt tungstate of this example, at first cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) and deionized water are mixed and dissolved according to the mass ratio of 0.002:1 to obtain solution A, and then the morphology regulator ammonium fluoride, sodium tungstate (Na 2 WO 4 4H 2 O) and deionized water were mixed and dissolved according to the mass ratio of 0.001:0.002:1 to obtain solution B. Then solution A and solution B were mixed in equal volumes and subjected to precipitation reaction. The reaction temperature was 25°C and the reaction time was 4 hours. After the reaction was completed, it was cooled and washed three times by deionized water and ethanol, respectively, and finally in a vacuum of Under the condition of 0.8KPa and temperature of 60°C, carry out vacuum drying for 10h to obtain cobalt tungstate.

[0037] The cobalt tungstate synthesized in this preparation example, after testing its XRD pattern is as f...

preparation example 2

[0041] In the synthetic method of the electrode material cobalt tungstate of this example, at first cobalt nitrate (Co(NO 3 ) 2 ) and deionized water are mixed and dissolved according to the mass ratio of 0.003:1 to obtain solution A, and then the morphology regulator sodium lauryl sulfate, calcium tungstate (CaWO 4 ) and deionized water were mixed and dissolved according to the mass ratio of 0.001:0.003:1 to obtain solution B. Then solution A and solution B were mixed in equal volumes to carry out precipitation reaction. The reaction temperature was 40°C and the reaction time was 6 hours. After the reaction was completed, it was cooled and washed three times by centrifugation with deionized water and ethanol. Under the condition of 0.8KPa and temperature of 60°C, carry out vacuum drying for 10h to obtain cobalt tungstate.

[0042] The cobalt tungstate electrode material synthesized in this example adopts the same electrochemical test, and its specific capacitance value reac...

preparation example 3

[0044] In the synthetic method of the cobalt tungstate of this example, at first cobalt bromide (CoBr 2 ) and deionized water are mixed and dissolved at a ratio of 0.004:1 to obtain solution A, and then the morphology regulator hexadecyltrimethylammonium bromide, cadmium tungstate (CdWO 4 ) and deionized water were mixed and dissolved according to the mass ratio of 0.002:0.004:1 to obtain solution B. Then, solution A and solution B were mixed in equal volumes and subjected to precipitation reaction. The reaction temperature was 90° C., and the reaction time was 8 hours. After the reaction was completed, it was cooled and washed three times by deionized water and ethanol, respectively. Under the condition of 0.8KPa and temperature of 60°C, carry out vacuum drying for 10h to obtain cobalt tungstate.

[0045] The cobalt tungstate electrode material synthesized in this example adopts the same electrochemical test, and its specific capacitance value reaches 178.85F / g at a current ...

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Abstract

The invention provides a synthesis method of an electrode material cobalt tungstate for a supercapacitor. The synthesis method comprises: carrying out mixing dissolving on a cobalt salt and deionizedwater to obtain a solution A, carrying out mixing dissolving on a morphology regulator, a tungstate and deionized water to obtain a solution B, mixing the solution A and the solution B according to avolume ratio of 1:1, carrying out a precipitation reaction, cooling after the precipitation reaction is finished, washing, and drying to obtain cobalt tungstate. According to the invention, based on the high conductivity of the tungstate, the cobalt tungstate prepared by combining cobalt ions and tungstate ions is used as a capacitor electrode material, so that the high reversibility, the excellent cycle performance and the excellent stability can be achieved, and the prepared cobalt tungstate has a coralline-like structure, has a specific surface area, can substantially improve the specific capacitance value of the electrode material, and further has good electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of preparation of electrode materials for supercapacitors, in particular to a method for synthesizing cobalt tungstate as an electrode material for supercapacitors. Background technique [0002] As a new type of energy storage device, supercapacitors have the advantages of high power density and long charging and discharging time. As the main evaluation standard of supercapacitors, the selection of electrode materials for supercapacitors is also particularly important. The types of supercapacitor electrode materials mainly include carbon materials, conductive polymers and metal oxides. However, due to the shortcomings of carbon materials and conductive polymers in terms of capacitive and cycle stability, more and more people are beginning to focus on on metal oxides. [0003] Metal oxides, especially transition metal oxides, have received more and more attention due to their environmental friendliness, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01G11/24H01G11/46
CPCC01G51/00C01P2002/72C01P2004/03H01G11/24H01G11/46Y02E60/13
Inventor 张向京魏婷徐晓阳赵莹胡永琪
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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