Porous carbon material, and preparation method and application thereof
A technology of porous carbon materials and carbon materials, applied in the direction of hybrid capacitor electrodes, etc., can solve the problems of increasing environmental protection costs of sewage treatment, and achieve the effects of good electrochemical performance, low cost, and good cycle performance
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[0030] The invention provides a method for preparing a porous carbon material, comprising the following steps:
[0031] (1) Pretreating the papermaking black liquor to obtain a solid mixture, the papermaking black liquor being waste liquor containing KOH produced by alkaline papermaking;
[0032] (2) Carbonizing the solid mixture obtained in the step (1) to obtain a carbon material;
[0033] (3) Activate the carbon material obtained in the step (2) to obtain a porous carbon material.
[0034] The invention uses papermaking black liquor as raw material, and the papermaking black liquor is waste liquor containing KOH produced by alkaline papermaking. Papermaking black liquor is rich in a large amount of lignin (Lignin), which is an amorphous, aromatic polymer containing oxyphenylpropanol or its derivatives in its molecular structure. , high-quality carbon materials can be obtained after carbonization and activation; KOH in the papermaking black liquor is used as an activator, ...
Embodiment 1
[0069] (1) Grinding after first drying the straw, then passing through a 40-mesh steel sieve, and drying the straw powder obtained at 105° C. for 12 hours;
[0070] (2) with mass concentration being 2% KOH solution as the lye of rice straw pretreatment, the rice straw powder that step (1) obtains is weighed 10g and mixes with the KOH solution of 100mL;
[0071] (3) After the mixture in the step (2) was stirred evenly, it was transferred to a stainless steel reaction kettle lined with polytetrafluoroethylene, and reacted at 120° C. for 4 hours to carry out alkali pretreatment reaction;
[0072] (4) Cool the product obtained in step (3) at a rate of 5°C / min in a cold water bath, centrifuge at a rate of 4000r / min to obtain black liquor, dry at a constant temperature in an oven for 12 hours, remove all moisture, and obtain a solid mixture;
[0073] (5) Transfer the solid mixture in step (4) to a corundum boat, then transfer it to a tube furnace, use a heating rate of 2°C / min to r...
Embodiment 2
[0076] Mix the porous carbon material prepared in Example 1 with acetylene black and polytetrafluoroethylene in a mass ratio of 80:10:10, add ethanol to make a smooth paste, use foamed nickel as a current collector, and coat it on the foamed nickel , and dried overnight at 50°C in a vacuum of 0.1 Pa to obtain a carbon electrode.
[0077] With 6mol / L KOH as the electrolyte, a simulated supercapacitor unit was assembled for cyclic voltammetry and constant current charge and discharge tests.
[0078] Tests show that after the porous carbon material prepared in this example is made into a supercapacitor, the specific capacitance reaches 234F / g under the three-electrode test.
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