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A kind of homogeneous corn cob derived carbon electrode material and preparation method thereof

A technology of electrode materials and corn cobs, applied in chemical instruments and methods, hybrid capacitor electrodes, carbon compounds, etc., can solve problems such as difficulty in obtaining, and achieve the effects of low cost, rich raw materials, and uniform microstructure

Active Publication Date: 2022-01-21
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the present invention develops a simple physical sieving method that can easily obtain a homogeneous corncob precursor, thereby overcoming the defect that the homogeneous corncob precursor is difficult to obtain

Method used

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  • A kind of homogeneous corn cob derived carbon electrode material and preparation method thereof
  • A kind of homogeneous corn cob derived carbon electrode material and preparation method thereof
  • A kind of homogeneous corn cob derived carbon electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The collected corncobs were cleaned, dried, crushed, and sieved to obtain corncob powder particles between 10 and 18 mesh; the obtained corncob powder particles were transferred to a tube furnace and heated at a heating rate of 5 °C / min in a nitrogen atmosphere Heat at 800 °C for 2 hours, then carbonize; mix the obtained carbonized material with KOH at a mass ratio of 1:3, grind thoroughly, and heat to 800 °C at a heating rate of 5 °C / min in a nitrogen atmosphere for 2 hours to obtain an activated product ; The activated product was soaked in 1 mol / L HCl solution, then washed alternately with deionized water and alcohol, and finally dried in a drying oven at 60 °C to obtain a homogeneous corncob-derived carbon electrode material.

[0031] The scanning electron microscope (SEM) image of the prepared homogeneous corncob-derived carbon electrode material is shown in figure 1 shown by figure 1 It can be seen that the microstructure and particle size of the prepared activat...

Embodiment 2

[0033] The collected corncobs were cleaned, dried, crushed, and sieved to obtain corncob powder particles between 170 and 200 mesh; the obtained corncob powder particles were transferred to a tube furnace and heated at a heating rate of 20 °C / min in a nitrogen atmosphere Heat at 600 °C for 24 h, then carbonize; mix the obtained carbonized material with KOH at a mass ratio of 1:1, grind thoroughly, and heat to 1000 °C for 12 h at a heating rate of 10 °C / min in a nitrogen atmosphere to obtain activation Product; the obtained activated product was soaked in 6mol / L HCl solution, then washed alternately with deionized water and alcohol, and finally dried in a 150 °C drying oven to obtain a homogeneous corncob-derived carbon electrode material.

[0034] The scanning electron microscope (SEM) image of the prepared homogeneous corncob-derived carbon electrode material is shown in Figure 5 shown by Figure 5 It can be seen that the microstructure and particle size of the prepared act...

Embodiment 3

[0036] The collected corncobs were cleaned, dried, crushed, and sieved to obtain corncob powder particles between 325 and 400 mesh; the obtained corncob powder particles were transferred to a tube furnace and heated at a heating rate of 3 °C / min in a nitrogen atmosphere Heat at 1000 °C for 1 h, then carbonize; mix the obtained carbonized material with KOH at a mass ratio of 1:6, grind thoroughly, and heat to 600 °C at a heating rate of 20 °C / min in a nitrogen atmosphere for 24 h to obtain activation Product; the activated product was soaked in 3 mol / L HCl solution, then washed alternately with deionized water and alcohol, and finally dried in a drying oven at 50 °C to obtain a homogeneous corncob-derived carbon electrode material.

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Abstract

The invention discloses a homogeneous corncob-derived carbon electrode material for supercapacitors and a preparation method thereof. The method adopts screening pre-selection and subsequent carbonization activation to realize the homogeneous preparation of corncob-derived carbon particles. The specific preparation process steps are as follows: first, crush the biomass corn cob, obtain corn cob powder particles with different particle size distribution ranges by sieving, and carbonize at high temperature; then use an activator to activate the obtained carbonized material powder particles at high temperature; finally activate the The final product is acid-washed and dried to obtain a homogeneous corncob-derived carbon electrode material. When the homogeneous corncob-derived carbon electrode material of the invention is used as an electrode material for a supercapacitor, it exhibits high specific capacitance and rate performance. The method has the characteristics of simple process, abundant raw materials, environmental friendliness, high added value and the like.

Description

technical field [0001] The invention relates to a biomass-derived carbon electrode material and a preparation method thereof, in particular to a homogeneous corncob-derived carbon electrode material and a preparation method thereof; belonging to the field of new energy materials. Background technique [0002] With the depletion of fossil energy and the seriousness of environmental pollution, biomass-derived carbon supercapacitor electrode materials are favored by researchers because of their wide range of raw materials, low cost, renewability, and no pollution. [0003] Biomass corncobs are rich in sources and have well-developed pores. The preparation of activated carbon not only reduces the environmental pollution caused by discarding or burning them directly, but also transforms them into high-performance supercapacitor electrode materials, turning corncobs into waste. It is a treasure, which enhances its added value and realizes the effective utilization of resources. Q...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/324C01B32/348H01G11/24H01G11/34H01G11/44
CPCH01G11/24H01G11/34H01G11/44C01B32/324C01B32/348Y02E60/13
Inventor 杨树华艾金贵孙靖曹丙强
Owner UNIV OF JINAN
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