Method for preparing graphene-loaded platinum nano catalyst

Abstract

The invention discloses a method for preparing a graphene-loaded platinum nano catalyst, which comprises the following steps of: (1) preparing graphene (GNS); (2) preparing polydiallyl dimethyl ammonium chloride (PDDA) functional graphene; and (3) preparing the graphene-loaded platinum nano (Pt / GNS) catalyst. The method has the advantages of uniformly adsorbing and distributing PtCl6<2-> with negative charge on the surface of the GNS through electrostatic adhesion by using positive charge uniformly distributed on the surface of the PDDA-modified GNS, solving the technical problem that metallic particles per se aggregate, realizing higher loading rate of PtNPs and having uniform grain size and controllable size.

Description

Technical field

[0001] The present invention involves a method of preparation of a catalyst, especially the preparation method of a graphene loading platinum nano -catalyst. Background technique

[0002] A fuel cell is an energy device that translates the chemical energy of fuel into electrical energy without burning without burning. It has the advantages of high energy conversion density, small pollution, diversified fuel, high reliability, low noise, and easy maintenance.It has been highly valued by countries around the world.The research of direct methanol fuel cells is more concerned.It can be used for power power, mobile phone and knee -on -type computer power supply, etc., and is considered one of the replacement energy technologies that are most likely to obtain large -scale commercial applications.However, the anode catalyst of the direct methanol fuel cell has low electrocatalyst activity, and the CO produced by electrocatalytic oxidation methanol can poison the catalyst...

Examples

Embodiment 1

[0022](1) Graphene (GNS) is based on the improved Hummer's merthod (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 Chem Soc. 2009, 131, 1043-1049.) Preparation: 1.0 g graphite and 1.0 g NaNO 3 Add to 46 mL H 2 SO 4 (98%) solution, mechanically stirred in ice bath for 20 minutes, slowly added 6.0 g KMnO 4 and 80 mL of double-distilled water, the temperature was controlled at 90 ± 5 °C, and after stirring for 30 minutes, 200 mL of double-distilled water was added to the reaction system and 6 mL of 30 wt % H 2 o 2 The solution was filtered while it was hot, washed with double distilled water until the filtrate was neutral, and the obtained product was dispersed in 500 mL of double distilled water, and ultrasonicated for 2 hours to obtain uniformly dispersed single-sheet graphene.

[0023] (2) Preparation of PDDA functional...

Embodiment 2

[0027] (1) For the preparation method of GNS and PDDA-GNS, refer to steps (1) and (2) of Example 1.

[0028] (2) Preparation of Pt / GNS catalysts with different Pt loadings: Disperse PDDA-GNS (10.8 mg) in 30 mL double-distilled water, sonicate for 30 min, and then add 10.8, 16.2, 27.0 mg, 37.8, 64.0, 91.8 mg, respectively mg H 2 PtCl 6 , continue to sonicate for 30 min, then slowly add NaBH under the condition of magnetic stirring 4 (0.05 M) solution, after magnetic stirring for 2 h, the obtained product was centrifuged and washed with double distilled water, and the product was vacuum-dried for 48 h at 40 °C to obtain the mass fraction of Pt / GNS catalyst Pt NPs respectively 30 wt %, 40 wt %, 50 wt %, 60 wt %, 72 wt %, 78 wt %.

[0029] The transmission electron microscope photo of the prepared Pt / GNS nanocomposite is shown in Figure 5 ,Depend on Figure 5 It can be seen that the particle size of Pt NPs does not change significantly with the increase of the feed ratio of...

Technical field

[0001] The present invention involves a method of preparation of a catalyst, especially the preparation method of a graphene loading platinum nano -catalyst. Background technique

[0002] A fuel cell is an energy device that translates the chemical energy of fuel into electrical energy without burning without burning. It has the advantages of high energy conversion density, small pollution, diversified fuel, high reliability, low noise, and easy maintenance.It has been highly valued by countries around the world.The research of direct methanol fuel cells is more concerned.It can be used for power power, mobile phone and knee -on -type computer power supply, etc., and is considered one of the replacement energy technologies that are most likely to obtain large -scale commercial applications.However, the anode catalyst of the direct methanol fuel cell has low electrocatalyst activity, and the CO produced by electrocatalytic oxidation methanol can poison the catalyst...

Examples

Embodiment 1

[0022](1) Graphene (GNS) is based on the improved Hummer's merthod (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 Chem Soc. 2009, 131, 1043-1049.) Preparation: 1.0 g graphite and 1.0 g NaNO 3 Add to 46 mL H 2 SO 4 (98%) solution, mechanically stirred in ice bath for 20 minutes, slowly added 6.0 g KMnO 4 and 80 mL of double-distilled water, the temperature was controlled at 90 ± 5 °C, and after stirring for 30 minutes, 200 mL of double-distilled water was added to the reaction system and 6 mL of 30 wt % H 2 o 2 The solution was filtered while it was hot, washed with double distilled water until the filtrate was neutral, and the obtained product was dispersed in 500 mL of double distilled water, and ultrasonicated for 2 hours to obtain uniformly dispersed single-sheet graphene.

[0023] (2) Preparation of PDDA functional...

Embodiment 2

[0027] (1) For the preparation method of GNS and PDDA-GNS, refer to steps (1) and (2) of Example 1.

[0028] (2) Preparation of Pt / GNS catalysts with different Pt loadings: Disperse PDDA-GNS (10.8 mg) in 30 mL double-distilled water, sonicate for 30 min, and then add 10.8, 16.2, 27.0 mg, 37.8, 64.0, 91.8 mg, respectively mg H 2 PtCl 6 , continue to sonicate for 30 min, then slowly add NaBH under the condition of magnetic stirring 4 (0.05 M) solution, after magnetic stirring for 2 h, the obtained product was centrifuged and washed with double distilled water, and the product was vacuum-dried for 48 h at 40 °C to obtain the mass fraction of Pt / GNS catalyst Pt NPs respectively 30 wt %, 40 wt %, 50 wt %, 60 wt %, 72 wt %, 78 wt %.

[0029] The transmission electron microscope photo of the prepared Pt / GNS nanocomposite is shown in Figure 5 ,Depend on Figure 5 It can be seen that the particle size of Pt NPs does not change significantly with the increase of the feed ratio of...

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