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N-Fe2O3/nitrogen-sulfur double-doped graphene composite electrode material and preparation method thereof

A graphene composite and electrode material technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve problems such as hindering the development of electrode materials, poor cycle stability, etc., achieving a simple and pollution-free synthesis process and improving stability. , the effect of uniform dispersion

Inactive Publication Date: 2017-08-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the poor cycle stability hinders the further development of practical electrode materials.

Method used

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  • N-Fe2O3/nitrogen-sulfur double-doped graphene composite electrode material and preparation method thereof
  • N-Fe2O3/nitrogen-sulfur double-doped graphene composite electrode material and preparation method thereof
  • N-Fe2O3/nitrogen-sulfur double-doped graphene composite electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 1.6159g Fe(NO 3 ) 3 9H 2 O (0.004mol), 0.9134g NH 4 SCN (0.012mol) was ultrasonically dispersed in 70mL of a mixed solution of absolute ethanol and ethylene glycol (2:1 volume ratio), ultrasonically dispersed for 1h, and the mixed solution was transferred to a 100mL hydrothermal kettle, and reacted at 180°C for 24h. After the reaction was completed, it was naturally cooled to room temperature, washed with anhydrous ethanol and deionized water alternately for ten times, then dried in a vacuum oven at 60°C for 12 hours, and ground to obtain N-Fe 2 o 3 Nanoparticles. The samples have X-ray diffraction peaks at 2θ of 24.15°, 33.16°, 35.63°, 40.82°, 49.46°, 54.07°, 57.60°, 62.44°, 64.00°, 71.95° and 75.46°, which can be compared with Fe 2 o 3 (012), (104), (110), (113), (024), (116), (018), (214), (300), (1010) and (220) crystal planes and standard spectra of crystals corresponding, such as figure 1 , the diffraction peaks in the figure are the characteristic d...

Embodiment 2

[0034] Weigh 90mg graphene oxide, 0.9134g NH 4 SCN (0.012mol) was ultrasonically dispersed in 70mL of a mixed solution of absolute ethanol and ethylene glycol (2:1 volume ratio), ultrasonically dispersed for 1h, and the mixed solution was transferred to a 100mL hydrothermal kettle, and reacted at 180°C for 24h. After the reaction was completed, it was naturally cooled to room temperature, washed with absolute ethanol and deionized water by centrifugation for ten times, and then dried in a vacuum oven at 60° C. for 12 hours to obtain nitrogen-sulfur double-doped graphene. Nitrogen-sulfur double-doped graphene has a large specific surface area. The doping of nitrogen and sulfur activates the adjacent carbon atoms, increases the number of active sites, and facilitates the reaction between electrolyte ions and active materials. The nitrogen-sulfur double-doped graphene material prepared above was subjected to charge and discharge experiments, and the current density was 1Ag -1 , ...

example 3

[0036] Weigh 90mg graphene oxide, 1.6159g Fe(NO 3 ) 3 9H 2 O (0.004mol), 1.8269g NH 4 SCN (0.024mol) was ultrasonically dispersed in 70mL of a mixed solution of absolute ethanol and ethylene glycol (volume ratio 0.5:1), ultrasonically dispersed for 1h, and the mixed solution was transferred to a 100mL hydrothermal kettle, and reacted at 180°C for 24h. After the reaction was completed, it was naturally cooled to room temperature, washed with absolute ethanol and deionized water alternately for ten times, and then dried in a vacuum oven at 60°C for 12 hours to obtain N-Fe 2 o 3 / Three-dimensional nitrogen-sulfur double-doped graphene. The product is analyzed by X-ray photoelectron spectroscopy (XPS). Nitrogen exists in the form of graphite nitrogen, pyridine nitrogen, pyrrole nitrogen and N-Fe, and sulfur exists in the form of S 2p 3 / 2 , S 2p 1 / 2 and-SO n - forms exist, indicating successful doping of nitrogen atoms to Fe 2 o 3 On the lattice surface of graphene, nitro...

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Abstract

The invention provides an N-Fe2O3 / nitrogen-sulfur double-doped graphene composite electrode material and a preparation method thereof. The method comprises: step one, oxidized graphene is added into a mixed solution of ethyl alcohol and ethylene glycol and ultrasonic dispersion is carried out to obtain a stable homogeneous dispersion solution A of oxidized graphene; step two, ferric nitrate nonalydrate and a nitrogen-sulfur source are added into the dispersion solution A obtained at the step one, and stirring is carried out uniformly to obtain a mixed solution B; step three, the mixed solution B obtained at the step two is transferred to a polytetrafluoroethylene hydrothermal reactor to carry out constant-temperature hydrothermal reaction, and after completion of reaction, a mixed solution C is obtained; and step four, suction filtration is carried out on the mixed solution B obtained at the step three and then cleaning and drying are carried out successively, thereby obtaining a product of N-Fe2O3 / nitrogen-sulfur double-doped graphene composite electrode material. According to the invention, the N-Fe2O3-nano-particle loaded double-doped graphene material is obtained by synthesis based on a one-step hydrothermal method for nano particle synthesis. The raw materials are available easily; green and environment-friendly effects are good; and the synthesis process is simple without any pollution.

Description

technical field [0001] The invention relates to a method for preparing a composite material, in particular to a method for preparing a nitrogen-doped ferric oxide nanoparticle composite material locally loaded with nitrogen-sulfur double-doped graphene as a matrix. The prepared composite material can be applied to in the field of supercapacitors. Background technique [0002] With the increasingly serious problems of environmental pollution and energy shortage, it is imminent to find new alternative energy sources and energy storage devices. Supercapacitors have attracted extensive attention due to their high specific capacitance, good cycle stability, wide operating temperature range, environmental protection, high charging efficiency and short charging time. Graphene has a single-layer two-dimensional structure. Due to its large specific surface area, ultra-high stability and excellent electrical conductivity, it has become a research hotspot in the field of electrochemis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/46H01G11/32H01G11/36H01G11/86
CPCY02E60/13H01G11/46H01G11/32H01G11/36H01G11/86
Inventor 章明美王滢潘登辉李远马天骄闫早学谢吉民
Owner JIANGSU UNIV
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