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Preparation method of nitrogen-doped graphene loaded platinum nano-particle catalyst

A nitrogen-doped graphene and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of uneven particle size distribution, Pt nano Particle shedding, reducing electrical activity and other problems, to achieve the effect of improving electron conductivity, accelerating nucleation, and preventing agglomeration

Inactive Publication Date: 2013-10-30
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the surface of GNs is directly loaded with Pt nanoparticles without modification, it often leads to uneven particle size distribution and large particle size.
Moreover, the direct loading of Pt nanoparticles without surface modification leads to the fact that Pt nanoparticles are easily detached from the surface of GNs or aggregated due to the migration of Pt nanoparticles during the electrocatalysis process of the composite material, thereby reducing the electroactivity.

Method used

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  • Preparation method of nitrogen-doped graphene loaded platinum nano-particle catalyst
  • Preparation method of nitrogen-doped graphene loaded platinum nano-particle catalyst
  • Preparation method of nitrogen-doped graphene loaded platinum nano-particle catalyst

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Experimental program
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Embodiment 1

[0023] (1) Preparation of graphene oxide (GO): Graphene oxide was prepared by the modified Hummers method (Li, D.; Muller, M. B.; Gilje, S.; Kaner, R. B.; Wallace, G. G. Nat. Nanotechnol. 2008, 3 , 101-105; Hummers, W. S.; Offeman, R. E. J. Am. Chem. Soc. 1958, 80, 1339; Cote, L. J.; Kim, F.; Huang, J. X. J. Am. ). The specific synthesis process is as follows, 1.0 gram (g) graphite and 1.0 g NaNO 3 Add 46 milliliters (mL) of 98% H 2 SO 4 , after 20 minutes of mechanical stirring in an ice bath, slowly add 6.0 g KMnO 4 , transferred to a water bath to control the temperature to be 35 ° C, continue stirring for 60 minutes, take it out from the water bath and add 80 mL of double distilled water at room temperature, after stirring for 30 minutes, add 200 mL of double distilled water, then slowly add 6 The mass ratio (wt%) of mL is 30 wt% H 2 o 2 Solution, react at room temperature for 1 hour, wash with double distilled water after the reaction until the filtrate is neutral, ...

Embodiment 2

[0029] (1) Conduct electrochemical analysis and research on the nanocomposites synthesized in steps (1), (2), (3), and (4) of Example 1, and take 5 μL of 1.0 mg / mL Pt / NGs suspension for drop coating onto the glassy carbon electrode (GCE) surface, and dry at room temperature. Using a three-electrode system, in a nitrogen-saturated concentration of 0.5 M H 2 SO 4 Cyclic voltammetry scanning at a rate of 20 mV / s in solution shows that the electrochemically active area of ​​Pt / NGs catalyst is 73.2 m 2 g -1 ,Such as Figure 6 shown. Using the nanomaterial modified electrode as the working electrode, cyclic voltammetry scanning was performed at a rate of 10 mV / s in an oxygen-saturated KOH solution with a concentration of 0.5 mol / L. The results showed that NGs and Pt / NGs catalysts have good oxygen Electrocatalytic activity, and the electrocatalytic activity of Pt / NGs catalyst for oxygen is higher than that of NGs, such as Figure 7 shown. The modified electrode performs line...

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Abstract

The invention discloses a preparation method of a nitrogen-doped graphene loaded platinum nano-particle catalyst. The preparation method comprises the following steps of: firstly, preparing graphene oxide (GO); secondly, preparing polyaniline / graphene oxide (PANI / GO) through a liquid-liquid interface polymerization method; thirdly, drying the PANI / GO, transferring the dried PANI / GO into a tubular furnace, and performing high-temperature treatment for 2 hours at 800 DEG C to prepare NGs (nitrogen-doped graphenes); and finally, ultrasonically dispersing the NGs into an aqueous solution, uniformly mixing the NGs with chloroplatinic acid according to a certain mass ratio, slowly adding sodium borohydride (NaBH4) into the mixed solution, and performing magnetic stirring for 8 hours to prepare the NGs loaded platinum nano-particle catalyst (Pt / NGs) which takes the NGs as a catalyst carrier to uniformly load platinum nano-particles to the surfaces of the NGs without any chemical modification. The nitrogen atoms which are doped into molecular structures of GNs not only provide a large amount of active sites for PtNPs loading, but also enhance the interaction between the PtNPs and an NGs carrier and improve the catalytic stability and catalytic activity of a nano composite material.

Description

technical field [0001] The invention relates to a preparation method of a nitrogen-doped graphene-supported platinum nanoparticle catalyst. Background technique [0002] Graphene (GNs) is a two-dimensional crystal with a single layer of carbon atoms. GNs has extraordinary electrical conductivity, ultra-high specific surface area, strength dozens of times stronger than steel, and excellent light transmission. Its application prospects very broad. Currently, GNs are widely used as carrier materials to load Pt nanoparticles due to their excellent properties. However, if the surface of GNs is directly loaded with Pt nanoparticles without modification, it often leads to uneven particle size distribution and large particle size. Moreover, the direct loading of Pt nanoparticles without surface modification leads to the electrocatalysis process of the composite material. The Pt nanoparticles are easily detached from the surface of GNs or aggregated due to the migration of Pt nanop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42
Inventor 邱建丁刘晓晨梁汝萍王果冲石玲
Owner NANCHANG UNIV
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