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Preparation method and application of sweet potato leaf based active carbon

A sweet potato leaf, activated carbon technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of long electrolyte ion transmission path, low specific capacity of supercapacitor, complex internal pore structure, etc. Effects of transport and diffusion, excellent electrochemical performance, and high value-added utilization

Active Publication Date: 2017-02-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the porous carbon materials prepared from biomass are mostly granular porous carbons with complex internal pore structures. When they are applied to supercapacitor electrode materials, due to the long electrolyte ion transmission path, it is difficult to fully infiltrate and other shortcomings. As a result, supercapacitors have a series of shortcomings such as low specific capacity, poor rate performance, and short cycle life, which are difficult to meet industrial needs

Method used

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  • Preparation method and application of sweet potato leaf based active carbon
  • Preparation method and application of sweet potato leaf based active carbon
  • Preparation method and application of sweet potato leaf based active carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The collected sweet potato leaves were washed with deionized water multiple times to remove impurities such as sediment, dried in a blast drying oven at 120°C for 24 hours, and then crushed; 4 g of crushed sweet potato leaves were weighed and pre-carbonized under nitrogen protection. The temperature was raised from room temperature to 300 °C at a rate of 1 °C / min, kept at a constant temperature for 20 min, and cooled to room temperature to obtain a pre-carbonized product; the obtained pre-carbonized product and potassium hydroxide were added to 10 mL of deionized In water, dry in a blast drying oven at 120°C for 20 hours, and then perform high-temperature activation treatment under the protection of argon. The temperature is raised from room temperature to 600°C at a rate of 1°C / min, kept at a constant temperature for 20 minutes, and cooled to room temperature to obtain an activated product; The obtained activated product was added to 2 L of hydrochloric acid solution wi...

Embodiment 2

[0018] Wash the collected sweet potato leaves with deionized water multiple times to remove impurities such as sediment, dry them in a blast drying oven at 120°C for 24 hours, and then crush them; weigh 10 g of crushed sweet potato leaves, and perform pre-carbonization treatment under nitrogen protection. The temperature was raised from room temperature to 500°C at a rate of 5°C / min, kept at a constant temperature for 60 minutes, and cooled to room temperature to obtain a pre-carbonized product; the obtained pre-carbonized product and potassium hydroxide were added to 20 mL of deionized In water, dry in a blast drying oven at 120°C for 20 hours, and then perform high-temperature activation treatment under argon protection. The temperature is raised from room temperature to 800°C at a rate of 5°C / min, kept at a constant temperature for 60 minutes, and cooled to room temperature to obtain an activated product; The obtained activated product was added to 2 L of hydrochloric acid s...

Embodiment 3

[0020] Wash the collected sweet potato leaves with deionized water multiple times to remove impurities such as sediment, dry them in a blast drying oven at 120°C for 24 hours, and then crush them; weigh 20 g of the crushed sweet potato leaves, and perform pre-carbonization treatment under the protection of argon , the temperature was raised from room temperature to 800 °C at a rate of 15 °C / min, kept at a constant temperature for 20 min, cooled to room temperature, and a pre-carbonized product was obtained; the obtained pre-carbonized product and potassium hydroxide were added to 30 mL of Dry in ionized water for 20 hours in a blast drying oven at 120°C, and then perform high-temperature activation treatment under argon protection. The temperature rises from room temperature to 950°C at a rate of 15°C / min, keeps the temperature for 130 minutes, and cools to room temperature to obtain the activated product. The obtained activated product was added to 2L of hydrochloric acid solu...

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Abstract

The invention relates to the technical field of preparation of new energy source materials and provides a preparation method and application of sweet potato leaf based active carbon. The preparation method comprises the following steps: 1, washing sweet potato leaves with de-ionized water and then drying and crushing; carrying out pre-carbonization treatment under the protection of inert gas to obtain a pre-carbonized product; 2, mixing the obtained pre-carbonized product with potassium hydroxide; after drying, carrying out high-temperature activation treatment under the protection of the inert gas to obtain an activated product; and 3, carrying out acid washing and water washing on the obtained activated product, and then freezing and drying to obtain the sweet potato leaf based active carbon. The preparation method provided by the invention is simple in process and low in equipment cost; the raw materials are easy to obtain; and the sweet potato leaf based active carbon prepared by the method is of a sheet-shaped structure and has a series of advantages of high specific capacitance, good rate performance, long circulating long service life and the like when being used as an electrode material of a super-capacitor.

Description

technical field [0001] The invention relates to a preparation method and application of sweet potato leaf-based activated carbon, belonging to the technical field of new energy material preparation. Background technique [0002] With the rapid development of smart electronic devices, traditional physical capacitors as a backup power supply have been difficult to meet people's energy storage needs. As a new type of energy storage device, supercapacitors have both the high rate characteristics of traditional capacitors and the high The energy density characteristics are widely used in the backup power supply of computer memory, the energy supply system of electric vehicles, etc., which have the advantages of fast charging speed, long cycle life, and wide operating temperature range. Electrode materials are the key components that determine the performance of supercapacitors. Porous carbon materials have become supercapacitors due to their high specific surface area, adjustable...

Claims

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Application Information

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IPC IPC(8): C01B32/348C01B32/324H01G11/32H01G11/34
CPCY02E60/13H01G11/32C01P2004/03C01P2006/40H01G11/34
Inventor 邱介山李少锋于畅杨卷赵昌泰
Owner DALIAN UNIV OF TECH
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