Reduction carbon quantum dot/RuO2 composite material and preparing and application method thereof
A technology of carbon quantum dots and composite materials, which is applied in the reduction of carbon quantum dots/RuO2 composite materials and the fields of their preparation and application, can solve the problems such as supercapacitors of carbon quantum dot-based composite materials that have never been seen before.
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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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