Ternary composite material of nitrogen-doped carbon sphere/graphene/platinum nanoparticle and its preparation method and application
A composite material, graphene technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as poor dispersion, uneven nitrogen doping, and uneven temperature
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[0027] The present invention also provides a preparation method of a ternary composite material of nitrogen-doped carbon spheres / graphene / platinum nanoparticles, wherein the preparation method comprises the following steps:
[0028] 1) heat-treating the carbon-containing nitrogen source to obtain nitrogen-doped carbon spheres;
[0029] 2) dissolving nitrogen-doped carbon spheres in a solvent to form a nitrogen-doped carbon sphere solution, and then coating the nitrogen-doped carbon sphere solution on the surface of the glassy carbon to form a nitrogen-doped carbon sphere modified glassy carbon electrode;
[0030] 3) Disperse graphene oxide in a buffer solution to form a graphene oxide solution. In the graphene oxide solution, a glassy carbon electrode modified with nitrogen-doped carbon spheres is used as a working electrode, a platinum electrode is used as a counter electrode, and a calomel electrode is used as a reference The electrode is subjected to electrodeposition treat...
preparation example 1
[0047] According to the literature: Xiaoli Jiang, Yinling Wang*, Maoguo Li*, "Selecting Water-Alcohol Mixed Solvent for Synthesis of Polydopamine Nano-spheres Using Solubility Parameter", Scientific Reports2014, 4, Article Number6070. The method described in the preparation of polydopamine balls:
[0048] Synthesize polydopamine spheres (PDAs) in a water-alcohol mixed solvent, add 28 mL of CH to 112 mL of ultrapure water 3 OH, stir to mix. Add different volumes of ammonia water (NH 4 OH, 28-30%), 0.6mL, 0.8mL, respectively. After stirring and mixing for 30 min, 0.5 g of dopamine was added to the mixed solution. The solution gradually turned dark brown and was stirred at room temperature for 30 h. Finally, centrifuge, wash with ethanol and water respectively, and dry the obtained product at 60° C. overnight in a vacuum oven to obtain polydopamine spheres.
Embodiment 1
[0050] 1) Place the polydopamine balls in an electric furnace, and slowly raise the temperature from 25°C to 700°C at a rate of 3°C / min under an inert gas flow, calcinate at a constant temperature for 1 hour, and then cool down to 20°C at a rate of 5°C / min. ℃ to obtain black nitrogen-doped carbon spheres;
[0051] 2) Disperse the nitrogen-doped carbon spheres in water to obtain a nitrogen-doped carbon sphere solution with a mass concentration of 3 mg / mL; take 4 μL of the nitrogen-doped carbon sphere solution and coat it on the surface of the glassy carbon electrode (with a surface area of 7.065 mm 2 ), after drying, the nitrogen-doped carbon sphere modified glassy carbon electrode was obtained;
[0052] 3) Ultrasonic disperse graphene oxide in a phosphate buffer solution (pH=9.18) with a phosphate ion concentration of 0.067mol / L to prepare a graphene oxide solution with a mass concentration of 3 mg / mL; then, nitrogen-doped carbon Ball-modified glassy carbon electrode (with ...
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