Preparation method of supercapacitor electrode based on functional-form graphene
A supercapacitor and graphene technology, which is applied in the manufacture of hybrid capacitor electrodes and hybrid/electric double-layer capacitors, etc., can solve problems such as high temperature, and achieve the effect of large specific capacitance, easy realization and simple conditions.
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Embodiment 1
[0017] (1) Graphite oxide was prepared by the improved Hummers method. First, add 115ml of concentrated sulfuric acid into a 500ml Erlenmeyer flask, put the Erlenmeyer flask into a low-temperature thermostat, and control the temperature at about 0°C. Add 5g of natural flake graphite powder treated with dilute hydrochloric acid in advance, then add 2.5g NaNO 3 , then slowly add 15g KMNO 4 , After stirring the reaction for 2h. Move the Erlenmeyer flask into a constant temperature water bath at 35° C., and continue to stir and react for 2 hours. At this time, the solution turns purple-green. Then slowly add 230 ml of deionized water, raise the heating temperature to 95°C, and continue stirring for a period of time. Slowly add an appropriate amount of hydrogen peroxide. At this time, the solution turns golden yellow. Filter it while it is hot, and wash it repeatedly with 5% hydrochloric acid and deionized water until there is no sulfate ion in the filtrate. Finally, evenly coa...
Embodiment 2
[0021] (1) Dry the nickel foam coated with graphite oxide paste prepared in Example 1 in a vacuum drying oven at 45°C for 48 hours, then put it directly into a microwave oven in an air environment, and heat it with 1600W microwave for 1 minute. A nickel foam embedded with functional graphene is obtained.
[0022] (2) Electrodes for supercapacitors can be obtained after sheeting and cutting. The electrochemical performance tests were carried out on the electrochemical workstation and the constant current charge and discharge instrument respectively. The test results show that the electrode specific capacitance of the supercapacitor is as high as 227F / g when the charge and discharge current density is 1A / g, and the specific capacitance is as high as 223F / g when the scan rate is 1mV / s.
Embodiment 3
[0024] (1) Dry the nickel foam coated with graphite oxide paste prepared in Example 1 in a vacuum drying oven at 45°C for 48 hours, and then directly put it into a microwave oven (Ar gas protection) in an air environment, 800W The nickel foam embedded with functional graphene can be obtained by microwave heating for 2 minutes.
[0025] (2) Electrodes for supercapacitors can be obtained after sheeting and cutting. Electrochemical performance tests were performed on electrochemical workstations and constant current charge and discharge instruments. The test results show that the electrode specific capacitance of the supercapacitor is as high as 236F / g when the charge and discharge current density is 1A / g, and the specific capacitance is as high as 232F / g when the scan rate is 1mV / s.
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