Porous graphene electrode and preparation method
A porous graphene and graphene technology, applied in the field of electrochemical materials, can solve the problems of high cost and complicated preparation process, and achieve the effect of low price, simple process and low cost
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[0031] Such as figure 1 Shown, the first aspect of the present invention provides a kind of preparation method of porous graphene electrode, specifically comprises the following steps:
[0032] Step 1. The graphene oxide is prepared by the Hummers method, and the graphene oxide dispersion is obtained through centrifugation and ultrasonic dispersion.
[0033] Step 2, the graphene oxide dispersion and NaCl are formulated into a graphene oxide / NaCl dispersion in a mass ratio of 1: (2 to 10). It should be noted that the graphene oxide dispersion and NaCl can be in a mass ratio of 1. :2 to 1:10 can be adjusted arbitrarily, especially in the mass ratio range of 1:(7~9), the corresponding porous graphene electrode obtained has more excellent porosity and specific capacitance, in which graphene oxide / NaCl is dispersed Liquid particle size is less than 1μm.
[0034] Step 3: Print the graphene oxide / NaCl dispersion liquid on the predetermined substrate to form an electrode, and dry it...
Embodiment 1
[0043] Step 1. Utilize the Hummers method to prepare graphene oxide (hereinafter referred to as GO), and obtain a graphene oxide dispersion through centrifugation and ultrasonic dispersion, specifically:
[0044] Weigh 1g of graphite powder into a 250mL four-neck flask, measure 24mL of concentrated sulfuric acid into the four-neck flask, stir for 1h in an ice-bath environment (around 0°C), then slowly add 3g of potassium permanganate (about 30min), Continue to stir for 1 hour, then move to a 35°C water bath and stir for 2h, slowly add 46mL of deionized water (about 30min), continue stirring for 30min, move to a 90°C water bath, stir for 20min, remove the device and add 140mL of deionized water water, to stop the reaction, drop in hydrogen peroxide (H2 o 2 ) until no bubbles are generated, let stand overnight, centrifuge, and sonicate to obtain an aqueous dispersion of GO.
[0045] Step 2, the graphene oxide dispersion liquid and NaCl are formulated into a graphene oxide / NaCl ...
Embodiment 2
[0052] Porous graphene electrodes were prepared according to steps 1, 4 and 5 in Example 1, and only the mass ratio of the graphene oxide dispersion and NaCl in step 2 and the substrate in step 3 were changed to determine the best experimental parameters.
[0053] Step 2, the graphene oxide dispersion liquid and NaCl are formulated into graphene oxide / NaCl dispersion liquid at a mass ratio of 1:4.
[0054] Step 3: Print the graphene oxide / NaCl dispersion on a polyethylene terephthalate (PET) substrate to form an electrode, and dry it at 55° C. to obtain a graphene oxide / NaCl composite.
[0055] Specifically, such as Figure 4 As shown, it can be seen from the cyclic voltammogram that the specific capacitance of the graphene oxide electrode obtained in Example 2 is 410F / g.
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