Continuous Preparation of Porous Carbon/Fe by Carbonization Activation Oxidation 3 o 4 Methods
A technology of porous carbon and quartz tubes, which is applied in the field of preparing porous carbon/Fe3O4 composite materials, can solve the problems of difficult mass production, expensive raw materials, etc. Effect
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Embodiment 1
[0020] The preparation method is carried out according to the following steps:
[0021] ① Mix 1.50 g K 2 FeO 4 Add 100ml of distilled water and stir until completely dissolved, then transfer to a heating mantle at 100°C and continue stirring until K 2 FeO 4 Hydrolyzed to KOH, Fe(OH) 3 , then add 1.0 g of lignin for ultrasonic dispersion and continue stirring until the water evaporates to dryness, take out the magnet and put it in an oven at 100°C for 8 hours to obtain KOH, Fe(OH) 3 and a solid mixture of lignin;
[0022] ② if figure 1 As shown, take the obtained solid mixture 10 and put it into a clean porcelain boat 11, then place the porcelain boat 11 in the quartz tube 2, then place the quartz tube 2 in the constant temperature zone of the calciner 1, and one end of the quartz tube 2 passes through the first The pipeline 8 is connected with the steam generator 3 placed in the electric heating jacket 6, and the other end of the quartz tube 2 is connected with the wate...
Embodiment 2
[0028] The equipment used is the same as in Example 1.
[0029] ①The difference from Example 1 is that 1.0 g of coal tar pitch is ultrasonically dispersed in 100 ml of water, and then 1.50 g of K 2 FeO 4 , stirred with a magnet until completely dissolved, coal tar pitch, KOH and Fe(OH) 3 Continue heating and stirring until the water evaporates to dryness, take out the magnet and put it in an oven for drying to obtain a solid mixture.
[0030] ②, , Step is the same as embodiment 1, and difference is that water vapor passes through the time of stone should tube 2 be 90min, then obtain Fe 3 o 4 70% coal tar pitch based porous carbon / Fe 3 o 4 Composite material, labeled coal tar pitch-based porous carbon / Fe 3 o 4 -70%. The obtained coal tar pitch-based porous carbon / Fe 3 o 4 -70% XRD such as image 3 shown. The description shows that Fe 3 o 4 .
[0031] The coal tar pitch-based porous carbon / Fe obtained in Example 2 of the present invention 3 o 4 -70% is assem...
Embodiment 3
[0035] The preparation method is the same as that of Example 1, except that the time for water vapor to pass through the stone tube 2 is 30min, then Fe 3 o 4 60% Porous Carbon / Fe 3 o 4 Composite material, labeled lignin-based porous carbon / Fe 3 o 4 -60%.
[0036] The lignin-based porous charcoal / Fe obtained in Example 3 of the present invention 3 o 4 -60% is assembled into a supercapacitor electrode, and its specific capacity reaches 116 F / g when tested at a current of 1 A / g.
[0037] The lignin-based porous charcoal / Fe obtained in Example 3 of the present invention 3 o 4 -60% is used as the electrode material of lithium battery, and the lithium sheet is used as the counter electrode. At the current density of 0.1 A / g, the reversible specific capacity of discharge reaches 740 mAh / g, the reversible specific capacity of charge reaches 718 mAh / g, and the Coulombic efficiency reaches 97.0%.
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