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CoTe nanometer material applied to supercapacitor electrode and preparation method thereof
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A technology of supercapacitors and nanomaterials, applied in the field of nanomaterials, can solve the problems of environmental pollution restrictions, low reserves, poor conductivity, etc.
Inactive Publication Date: 2017-06-13
ZHEJIANG UNIV
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Among transition metal oxides, RuO2 has a high specific capacitance, but its high cost, low reserves and serious environmental pollution limit its practical application.
Other transition metal oxides such as MnO 2 , NiO and Co 3 o 4 , have also been extensively studied, these electrode materials compared to RuO 2 In terms of relatively low energy density, where MnO 2 There are abundant reserves, low cost, environmental friendliness, and high theoretical specific capacitance value, but its actual specific capacitance is low due to its poor conductivity
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Embodiment 1
[0026] 1) Put 0.3mmol Te, 0.3mmol CoCl 2 Dissolve in 24mL KOH solution with a concentration of 6M, add 6mL hydrazine hydrate, and stir at room temperature for a reaction time of 4 hours;
[0027] 2) Transfer the mixture to a 50mL polytetrafluoroethylene hydrothermal kettle, seal it, and react in a furnace at 200 degrees Celsius for 4 hours;
[0028] 3) After the reaction, the reactor was cooled with the furnace, and the black precipitate was collected by suction filtration, and washed with deionized water several times; the precipitate was baked at 70°C for 12 hours, and the obtained dry CoTe powder was used for the preparation of electrodes and test.
Embodiment 2
[0030] 1) Put 0.3mmol Te, 0.3mmol CoCl 2 Dissolve in 24mL KOH solution with a concentration of 6M, add 6mL hydrazine hydrate, and stir at room temperature for 3 hours;
[0031] 2) Transfer the mixture to a 50mL polytetrafluoroethylene hydrothermal kettle, seal it, and react in a furnace at 200 degrees Celsius for 4 hours;
[0032] 3) After the reaction, the reactor was cooled with the furnace, and the black precipitate was collected by suction filtration, and washed with deionized water several times; the precipitate was baked at 70°C for 12 hours, and the obtained dry CoTe powder was used for the preparation of electrodes and test.
Embodiment 3
[0034] 1) Put 0.3mmol Te, 0.3mmol CoCl 2 Dissolve in 24mL KOH solution with a concentration of 6M, add 6mL hydrazine hydrate, and stir at room temperature for 2 hours;
[0035] 2) Transfer the mixture to a 50mL polytetrafluoroethylene hydrothermal kettle, seal it, and react in a furnace at 200 degrees Celsius for 4 hours;
[0036] 3) After the reaction, the reactor was cooled with the furnace, and the black precipitate was collected by suction filtration, and washed with deionized water several times; the precipitate was baked at 70°C for 12 hours, and the obtained dry CoTe powder was used for the preparation of electrodes and test.
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Abstract
The invention discloses a CoTe nanometer material applied to a supercapacitorelectrode and a preparation method thereof. The CoTe nanometer material is of a nanoparticlepile structure. The preparation method comprises the following steps of weighing Te powder and CoCl2 and dissolving into a KOH solution; adding hydrazine hydrate and stirring to react in room temperature; transferring an obtained mixture to a hydrothermal kettle and performing thermal insulation reaction; then naturally cooling in room temperature, collecting black precipitation, washing through deionized water for multiple times, drying the precipitation and obtaining dry CoTe. When being applied to an electrode material of a supercapacitor, the CoTe nanometer material has excellent electrochemical property, charge transfer resistance can be as low as 0.0161 ohm, specific capacitance can reach 113.4 F.g<-l> under the condition that the discharge current is 5 mA, 100% capacitance can be kept after 1000 times of circulation, and specific capacitance, rate capacity and circulation stability are all excellent.
Description
technical field [0001] The invention relates to the field of nanometer materials, in particular to a nanometer material used as an electrode of a supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device, which uses porous carbon materials with high specific surface area as electrodes or uses electrode active materials for underpotential deposition, so that it can undergo rapid and reversible chemical adsorption / desorption or oxidation / reduction reactions to Obtain the capacitance of the order of Faraday, so it has both the energy storage characteristics of the battery and the power characteristics of the capacitor. It is thousands of times higher than the specific energy of the traditional electrolytic capacitor, and the leakage current is thousands of times smaller. It can charge and discharge 100,000 times More than one time without maintenance and maintenance, it can be used in the working state o...
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