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Preparation method and application of sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet

A technology of three-dimensional porous and carbon nanosheets, applied in nanocarbon, nanotechnology, nanotechnology, etc., can solve problems such as low energy density and limited power density, achieve high specific capacity, high product yield, and improve cycle stability Effect

Pending Publication Date: 2020-10-27
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can improve the specific capacity of potassium-ion batteries and thus obtain higher energy density, the power density is still very limited.
[0003] Compared with potassium-ion batteries, supercapacitors have higher power density, fast charge and discharge, and long cycle life, so they are widely used. However, compared with potassium-ion batteries, supercapacitors work by adsorbing electrolyte ions between the positive and negative electrodes. Store electrical energy, so the resulting lower energy density

Method used

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  • Preparation method and application of sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet
  • Preparation method and application of sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet
  • Preparation method and application of sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet

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Embodiment 1

[0067] Preparation of 1# sample;

[0068] Dissolve 1g of citric acid, 0.5g of thiocyanuric acid and 5g of sodium chloride template successively in 50ml of water, stir in a water bath at 60°C for 1h, and then evaporate to dryness in an oven at 100°C for 24h to obtain carbon source, sulfur source, A mixture of nitrogen source and inorganic salt template (precursor powder); then the obtained mixture is heated to 750°C at a rate of 2°C / min in argon, and calcined for 2h to obtain the S-N-C / NaCl intermediate product; finally, S-N-C / NaCl intermediate product was dissolved in deionized water as NaCl template agent, stirred and then centrifuged and dried to obtain sulfur and nitrogen co-doped three-dimensional porous carbon nanosheets, which were recorded as 1# sample.

Embodiment 2

[0070] Preparation of 2# sample: The difference from the 1# sample in Example 1 is that the obtained precursor powder is heated up to 800°C at a rate of 3°C / min in argon, and calcined for 1 hour to obtain S-N-C / NaCl The intermediate product is recorded as 2# sample.

Embodiment 3

[0072] Preparation of 3# sample: The difference from 1# sample in Example 1 is that the obtained precursor powder is heated up to 700°C at a heating rate of 1°C / min in argon, and calcined for 2.5h to obtain S-N-C / The NaCl intermediate product is recorded as 3# sample.

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Abstract

The invention discloses a preparation method of a sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet, and the method comprises the following steps: calcining and washing a mixture containing a carbon source, a sulfur source, a nitrogen source and an inorganic salt template agent to obtain the sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet. The sulfur-nitrogen co-doped three-dimensional porous carbon nanosheet prepared by the method has the advantages of large specific surface area, good conductivity, multiple active sites and the like, and excellent performances of high specific energy density and power density are obtained when the nanosheet is applied to a negative electrode of a potassium ion hybrid supercapacitor.

Description

technical field [0001] The application relates to a preparation method and application of sulfur and nitrogen co-doped three-dimensional porous carbon nanosheets, belonging to the technical field of supercapacitors. Background technique [0002] As an energy storage device widely used at present, lithium-ion batteries also bring about the shortage of lithium resources, thus limiting their use in the field of large-scale energy storage. Therefore, scientists turned their research focus to potassium, which is in the same main group as lithium and has abundant reserves and low cost. It has similar physical and chemical properties to lithium, and the working principles of potassium-ion batteries and lithium-ion batteries are also similar. Therefore, potassium ions Batteries are considered to be one of the most promising energy storage technologies that can replace lithium-ion batteries in the future. In recent years, a considerable number of electrode materials have been applie...

Claims

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Application Information

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IPC IPC(8): C01B32/15B82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/36
CPCC01B32/15B82Y30/00B82Y40/00H01G11/24H01G11/30H01G11/36Y02E60/13
Inventor 胡翔温珍海
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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