Sisal-based nitrogen and phosphorus co-doped activated carbon as well as preparation method and application thereof

A technology of co-doping, activated carbon, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of poor rate performance, the electrochemical performance of electrode materials is not very favorable, etc. Rich structure and strong practical effect

Inactive Publication Date: 2021-01-15
FANGDA CARBON NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, micropores with complex pore structures are not very beneficial to the electrochemical performance of electrode materials.
It has been reported that electrode materials with ultramicropores (0.70 nm) result in relatively high specific capacitance due to the desolvation of ions at low current densities, but these pores do not participate in the adsorption and desorption of ions at high current densities, thus lead to poor rate performance

Method used

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  • Sisal-based nitrogen and phosphorus co-doped activated carbon as well as preparation method and application thereof
  • Sisal-based nitrogen and phosphorus co-doped activated carbon as well as preparation method and application thereof
  • Sisal-based nitrogen and phosphorus co-doped activated carbon as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: Add 48g of potassium hydroxide, 3g of 30wt% hydrogen peroxide, 27.8g of urea and 10g of potassium phosphate in 500mL of deionized water in order to form a mixed solution after ultrasonic dissolution, then add 50g of 2-5mm short fibrous swords to the mixed solution hemp fiber. Stand still at 4°C for 120 minutes, and then at 0°C for 12 hours to obtain a pretreated sisal fiber mixture.

[0037] Step 2, drying the sisal fiber mixture obtained in Step 1 at 65° C. for 12 hours.

[0038] Step 3, place the dried sisal fiber mixture in step 2 in a nitrogen atmosphere, and heat at 3°C ​​min -1 The heating rate was raised to 300°C, kept for 35 minutes for carbonization, and then at 3°C ​​min -1 Raise the temperature to 650°C at a heating rate of 650°C and keep it warm for 120 minutes for activation to obtain crude activated carbon.

[0039] Step 4, the gac crude product that obtains in the step 3 is first used 6mol L -1 hydrochloric acid, and then washed with deionized...

Embodiment 2

[0042] Step 1: Add 48g of potassium hydroxide, 4.5g of 30wt% hydrogen peroxide, 27.8g of urea and 10g of potassium phosphate in 500mL of deionized water in order to form a mixed solution, then add 50g of 2-5mm short fibrous Sisal fiber. Stand still at 4°C for 35 minutes, and then stand at 0°C for 8 hours to obtain a pretreated sisal fiber mixture.

[0043] Step 2, drying the sisal fiber mixture obtained in Step 1 at 65° C. for 12 hours.

[0044] Step 3, place the dried sisal fiber mixture in step 2 in a nitrogen atmosphere, and heat at 1°C min -1The heating rate was raised to 250°C, kept for 60 minutes for carbonization, and then at 3°C ​​min -1 Raise the temperature to 750° C. at a heating rate of 750° C. and keep it warm for 60 minutes for activation to obtain crude activated carbon.

[0045] Step 4, the gac crude product that obtains in the step 3 is first used 6mol L -1 hydrochloric acid, and then washed with deionized water until neutral, and finally placed in an oven...

Embodiment 3

[0047] Step 1: Add 60g of potassium hydroxide, 3g of 30wt% hydrogen peroxide, 27.8g of urea and 10g of potassium phosphate in 500mL of deionized water in order to form a mixed solution after ultrasonic dissolution, and then add 50g of 2-5mm short fibrous swords to the mixed solution hemp fiber. Stand still at 4°C for 60 minutes, and then stand at 0°C for 8 hours to obtain a pretreated sisal fiber mixture.

[0048] Step 2, drying the sisal fiber mixture obtained in Step 1 at 65° C. for 12 hours.

[0049] Step 3, place the dried sisal fiber mixture in step 2 in a nitrogen atmosphere, -1 The heating rate was raised to 280°C, kept for 50 minutes for carbonization, and then at 2°C min -1 Raise the temperature to 600°C at a heating rate of 600°C and keep it warm for 90 minutes for activation to obtain crude activated carbon.

[0050] Step 4, the gac crude product that obtains in the step 3 is first used 6mol L -1 hydrochloric acid, and then washed with deionized water until neut...

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Abstract

The invention discloses sisal-based nitrogen and phosphorus co-doped activated carbon, and further discloses a preparation method of the sisal-based nitrogen and phosphorus co-doped activated carbon.The method comprises the following steps: sequentially subjecting sisal fibers to impregnating, drying, carbonizing, activating, washing and drying in a mixed solution to obtain the sisal-based nitrogen and phosphorus co-doped activated carbon. The mixed solution is prepared by adding potassium hydroxide, a hydrogen peroxide solution, urea and potassium phosphate into deionized water. The invention further provides application of the sisal-based nitrogen and phosphorus co-doped activated carbon. The sisal fibers are treated by a one-step method, so that the sisal-based nitrogen-phosphorus co-doped activated carbon prepared from the sisal fibers is of a hierarchical porous structure and has a reasonable specific surface area and excellent electrical properties.

Description

technical field [0001] The invention relates to the field of supercapacitors. More specifically, the present invention relates to a sisal-based nitrogen-phosphorus co-doped activated carbon and its preparation method and application. Background technique [0002] The excessive consumption of non-renewable fossil fuel resources such as coal and oil has created a serious crisis for the sustainable development of modern society. The development and efficient use of renewable resources is the most promising solution to the above problems. Biomass is one of the most abundant renewable resources on earth. Due to its availability, sustainability, unique structure and low cost, the use of various biomass materials as carbon sources to prepare activated carbon for supercapacitors has become a promising energy storage technology. Research hotspots. [0003] A supercapacitor is a new type of energy storage device between traditional capacitors and batteries. Due to its various appli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01B32/348C01B32/324
Inventor 拜永孝彭为民党锡江张桂兰
Owner FANGDA CARBON NEW MATERIAL CO LTD
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