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Homogeneous corncob derived carbon electrode material and preparation method thereof

A technology of electrode material and corn cob, which is applied in chemical instruments and methods, hybrid capacitor electrodes, inorganic chemistry, etc., can solve problems such as difficulty in obtaining, achieve low cost, simple preparation process, and overcome environmental pollution

Active Publication Date: 2019-01-01
UNIV OF JINAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Homogeneous corncob derived carbon electrode material and preparation method thereof
  • Homogeneous corncob derived carbon electrode material and preparation method thereof
  • Homogeneous corncob derived carbon electrode material and preparation method thereof

Examples

Experimental program
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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 h, then carbonize; mix the obtained carbonized material with KOH at a mass ratio of 1:3, grind thoroughly, and heat to 800 °C for 2 h at a heating rate of 5 °C / min in a nitrogen atmosphere to obtain activated Product; the obtained activated product was soaked in 1 mol / L HCl solution, then washed alternately with deionized water and alcohol, and finally dried in a 60 °C drying oven 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 activated car...

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 hours, then carbonize; mix the obtained carbonized material with KOH at a mass ratio of 1:1, grind thoroughly, heat to 1000°C at a heating rate of 10°C / min in a nitrogen atmosphere and hold for 12 hours to obtain an activated product The activated product was soaked in 6 mol / 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 ...

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 Keep warm at 1000 °C for 1 hour, then carbonize; mix the obtained carbonized material with KOH at a mass ratio of 1:6, grind thoroughly, heat to 600 °C at a heating rate of 20 °C / min in a nitrogen atmosphere, and keep warm for 24 h to obtain an activated 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 50 °C drying oven to obtain a homogeneous corncob-derived carbon electrode material.

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Abstract

The invention discloses a homogeneous corncob derived carbon electrode material used for a supercapacitor and a preparation method thereof. According to the method, by adopting screening preselectionand subsequent carbonization and activation, homogenizing preparation of corncob derivative carbon particles is achieved; the method comprises the following specific preparation process steps that firstly, biomass corncobs are crushed, through screening, corncob powder particles in different particle size distribution ranges are obtained, and high temperature carbonization is conducted; then an activator is adopted for conducting high temperature activation on obtained carbonized powder particles; finally, an activated product is subjected to acid washing and drying to obtain the homogeneous corncob derivative carbon electrode material. When being used as an electrode material of the supercapacitor, the homogeneous corncob derivative carbon electrode material shows high specific capacitance and rate performance. The method has the characteristics of being simple in process, rich in raw material, environmentally friendly, higher in 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 Applications(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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