Strontium-doped nitrogen-containing porous carbon material and preparation method and application thereof
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A porous carbon material and strontium doping technology, applied in the field of carbon porous materials, can solve the problems of high cost, low specific capacitance, cumbersome electrode material preparation process, etc., and achieve high specific surface area, simple preparation process, and favorable electron transport. Effect
Active Publication Date: 2018-01-05
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology
By modifying porous carbon materials, the pore size distribution can be adjusted, and at the same time solve the current problems of low specific capacitance, cumbersome preparation process of electrode materials, and high cost.
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Embodiment 1
[0036] The preparation method of strontium-doped nitrogen-containing porous carbon material is as follows:
[0037] Step 1) Preparation of strontium-containing precursors, 4 g of glucose, 2 g of semicarbazide, 31.2 mg of strontium nitrate, and 32.1 mg of sodium borohydride were sequentially added to deionized water, stirred and dissolved, and then put into a reaction kettle at 180 °C reaction, after which the product is filtered, washed, and dried to obtain a strontium-containing precursor;
[0038] Step 2) Activation of the strontium-containing precursor, mixing the strontium-containing precursor and KOH at a mass ratio of 1.0:2.0, soaking in deionized water and stirring, drying in a blast drying oven, and then calcining at 700 °C for 2 h under nitrogen protection , after cooling down, take out the roasted sample and grind it to obtain an activated strontium-containing precursor material;
[0039] Step 3) Post-treatment of the strontium-containing precursor, washing the abov...
Embodiment 2
[0045] In order to compare the effect of adding strontium content on the synthesis of carbon materials, a strontium-doped porous carbon material with twice the amount of strontium nitrate was prepared. The specific steps of the preparation method are the same as the preparation method of Example 1, except It is: the mass of strontium nitrate in the step 1) is 62.4 mg.
[0046] Isotherm adsorption curve and pore size distribution in embodiment 2, such as Image 6 and 7 As shown, the results show that the specific surface area is 2485 m 2 g -1 , with a total pore volume of 0.841 cm 3 g -1 .
[0047] The specific capacity test test result under the constant current charge and discharge of different rate in embodiment 2 is as follows Figure 8 As shown, when the current density is 0.5 A g -1 , the specific capacitance value reaches 325 F g -1 .
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Abstract
The invention discloses a strontium-doped nitrogen-containing porous carbon material. The strontium-doped nitrogen-containing porous carbon material is prepared from glucose, semicarbazide, strontium-containing inorganic salt and a reduction agent by steps of performing a hydrothermal reaction and processing, adding an alkali inorganic material solution and performing calcining, activating and processing, wherein the specific surface area is 2,000-2,485m<2> g<-1>, the average pore size distribution is 1.178-1.232nm and the micropore content is greater than 92%. The preparation method comprisesthe steps of 1) preparing a strontium-containing precursor; 2) performing activation of the strontium-containing precursor; and 3) performing post treatment of the strontium-containing precursor. Thestrontium-doped nitrogen-containing porous carbon material, used as the electrode material of a supercapacitor, has the specific capacitance value range of 319-424F g<-1> and high cycling stabilitiesat the current density of 0.5A g<-1>. The strontium doping amount is greatly lowered, and meanwhile, the specific surface area of the material is enlarged, hole diameter distribution is regulated andcontrolled, and electron transport and electrolyte transportation can be facilitated, and in addition, pseudocapacitance can be provided; and in addition, the preparation process is simple, and batchproduction can be realized favorably, so that the strontium-doped nitrogen-containing porous carbon material has high application prospect in the fields of a supercapacitor, a fuel cell and the like.
Description
technical field [0001] The invention relates to the technical field of carbon porous materials, in particular to a strontium-doped nitrogen-containing porous carbon material and a preparation method and application thereof. Background technique [0002] Supercapacitors have the characteristics of low cost, abundant materials, long charge and discharge life, and high safety performance. Supercapacitors are divided into electric double layer capacitors and pseudocapacitors. The energy storage of the electric double layer capacitor is realized by electrochemically polarizing the electrolyte solution, which is a reversible process, and no electrochemical reaction occurs, so the performance is stable and the cycle life is long. The maximum charge and discharge performance of the pseudocapacitor is controlled by the ion orientation and charge transfer speed on the surface of the electrochemically active material, and the charge transfer can be carried out in a short time, so it c...
Claims
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