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A kind of reduced carbon quantum dot/ruo2 composite material and its preparation and application method

A technology of carbon quantum dots and composite materials, which is applied in the field of reduced carbon quantum dots/RuO2 composite materials and their preparation and application, and can solve problems such as carbon quantum dot-based composite supercapacitors that have not been seen before.

Active Publication Date: 2016-02-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is necessary to adopt a preparation method with abundant raw material sources, simple and large-scale production, and there is no report on the use of carbon quantum dot-based composite materials in the field of supercapacitors.

Method used

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  • A kind of reduced carbon quantum dot/ruo2 composite material and its preparation and application method
  • A kind of reduced carbon quantum dot/ruo2 composite material and its preparation and application method
  • A kind of reduced carbon quantum dot/ruo2 composite material and its preparation and application method

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: the preparation method of reducing carbon quantum dots

[0028] Mix 0.2-2g of industrial-grade nano-graphite powder with a diameter of 30-400nm and 40-400mL of nitric acid solution with a concentration of 2-10mol / L, and ultrasonically treat it for 0.5-5h (100W, 40kHz); then transfer the ultrasonicated solution into a circle Heat and reflux in the bottom flask for 12-48 hours; after natural cooling, filter the obtained mixed solution, and then use a dialysis bag with a molecular weight cut-off of 1000-14000Da to dialyze for 12-96 hours, and then place the dialysate at 40°C for low-temperature drying; finally, further The reduced carbon quantum dots are obtained by thermal reduction at 200-600° C. for 1-5 hours at a low temperature in an argon atmosphere in a tube furnace. figure 1 a and b are transmission electron microscope (TEM) images of carbon quantum dots at different magnifications (the scales are 100 and 50nm, respectively). The prepared carbon quant...

Embodiment 2

[0029] Example 2: Preparation of carbon quantum dots / RuO based on reduced carbon quantum dots 2 complex method

[0030] First, the sol-gel method is adopted: hydrated ruthenium trichloride is dissolved in a mixed solution of absolute ethanol and deionized water with a volume ratio of 1:1, and sodium hydroxide solution is added during strong stirring until the pH value is controlled to 7.0, aging for 12 hours, centrifuged and washed, the obtained solid was vacuum-dried at 60°C for 10 hours, and then calcined in a muffle furnace at 150°C for 2 hours to obtain hydrated amorphous RuO 2 nanoparticles. Secondly, using the dipping deposition method: the RuO 2 Nanoparticles were added to the reduced carbon quantum dot solution and sonicated for 2 hours and stirred for 0.5-12 hours, and the mixture was vacuum-dried at 65°C for 12 hours to obtain reduced carbon quantum dots / RuO 2 Complex. figure 2 a is RuO 2 Scanning electron microscope (SEM) image of (scale bar is 5 μm); figure...

Embodiment 3

[0031] Example 3: Research on Capacitance Performance of Reduced Carbon Quantum Dots

[0032] Carbon quantum dots (or reduced carbon quantum dots) and the binder polytetrafluoroethylene (PTFE) are uniformly mixed in a mass ratio of 95:5, and are added dropwise to the collector foam nickel, dried in vacuum at 50°C, and then Press under 10MPa to obtain an electrode sheet, which is the working electrode. It forms a three-electrode system with a platinum counter electrode and a saturated calomel reference electrode. 2 SO 4 The cyclic voltammetry (CV) test was carried out in the electrolyte, the voltage window was 0-0.8V, and the scanning speed was 100mV / s. Such as image 3 As shown in a, reduced carbon QDs exhibit better capacitive behavior than carbon QDs. The specific capacity was tested in the same three-electrode system, the voltage window was 0-0.8V, and the current density was 2A / g. Such as image 3 As shown in b, the specific capacitances corresponding to carbon quant...

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Abstract

The invention discloses a reduction carbon quantum dot / RuO2 composite material and a preparing and application method thereof. According to the preparing method of a reduction carbon quantum dot, industrial grade nano-graphite powder with a diameter of 30-400 nm is mixed with 2-10 mol / L salpeter solution, ultrasonic treatment and reflux are carried out on the mixture in sequence for 2-8 h and 12-48 h respectively, filtration, dialysis and drying treatment are then carried out, and finally reduction carbon quantum dot is obtained by means of lower-temperature thermal reduction. The reduction carbon quantum dot modified RuO2 composite material is prepared with the sol-gel method and the dipping deposition method. The composite material has an excellent super-capacitor performance and is obviously better in specific capacity, multiplying power and cycle performance compared with pure RuO2. According to the reduction carbon quantum dot / RuO2 composite material and the preparing and application method thereof, the reduction carbon quantum dot with a diameter smaller than 10 nm is obtained with the chemical oxidation method and the lower-temperature thermal reduction method which are simple and suitable for large-scale production, the composite material based on the reduction carbon quantum dot is good in capacitance performance, and the preparing method is simple and easy to realize.

Description

technical field [0001] The invention relates to a reduced carbon quantum dot / RuO 2 Composite materials and their preparation and use as electrode materials for supercapacitors. Background technique [0002] Due to some unique properties such as quantum size effect and dielectric confinement effect, carbon quantum dots show attractive prospects in the fields of optical devices, solar cells and biomedicine. At present, there are basically no reports on the preparation of carbon quantum dots as electrode materials for supercapacitors, only W.WLiu et al [Adv. onto gold electrodes to study their supercapacitive behavior. However, it is necessary to adopt a preparation method with abundant raw material sources, simple and large-scale production, and there has been no report on the use of carbon quantum dot-based composite materials in the field of supercapacitors. There have been some reports on the composites of quantum dots and metal oxides (or polymers, etc.), but these repo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/24H01G11/46H01G11/36H01G11/86
CPCY02E60/13
Inventor 纪效波朱裔荣宋维鑫周洲
Owner CENT SOUTH UNIV