Preparation method of nitrogen-doped carbon nanofiber loaded gold nanoparticle oxygen reduction catalyst

Abstract

The invention discloses a preparation method of a nitrogen-doped carbon nanofiber loaded gold nanoparticle oxygen reduction catalyst. The preparation method comprises the following steps: soaking bacterial cellulose into deionized water until the bacterial cellulose is neutral, draining off water, adding a dopamine solution, stirring in a constant-temperature water bath at 50 DEG C, adding a Tri-HCl buffer solution with a pH value of 8.5, and continuing to stir, so as to finally obtain a bacterial cellulose and dopamine compound; and carrying out freeze drying on the bacterial cellulose and dopamine compound, putting the compound into a tubular furnace, carrying out high-temperature carbonization so as to obtain nitrogen-doped carbon nanofibers, and loading the nitrogen-doped carbon nanofibers with gold nanoparticles by virtue of a sodium borohydride chemical reduction method, so as to obtain the nitrogen-doped carbon nanofiber loaded gold nanoparticle oxygen reduction catalyst. The preparation method of the catalyst is simple, and the oxygen reduction property of the catalyst is excellent under alkali conditions. Compared with a Pt catalyst, the catalyst is relatively low in cost and good in stability.

Description

technical field

[0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a preparation method and application of a nitrogen-doped carbon nanofiber supported gold nanoparticle oxygen reduction catalyst. Background technique

[0002] The continuous exploitation and use of oil resources has caused energy crisis and environmental pollution, which has become the focus of global attention. At present, scientific research institutions, experts and scholars all over the world are developing and exploring new energy or new energy technologies to make energy and the environment sustainable. Among them, the fuel cell, as an energy conversion device, has attracted people's attention. Fuel cells have the advantages of high energy conversion efficiency, high energy density, green and clean, and have been applied in the power system and power generation system of new energy vehicles.

[0003] The slow oxygen reduction reaction at the fuel cell c...

Examples

preparation example Construction

[0029] Concrete preparation steps are as follows:

[0030] 1) Soak the bacterial cellulose with deionized water until neutral, drain the water, add dopamine solution and stir in a constant temperature water bath at 50°C, then add a Tri-HCl buffer solution with pH=8.5 and continue stirring, and finally obtain bacterial cellulose and Complex of polydopamine.

[0031] 2) freeze-dry the composite of bacterial cellulose and polydopamine, put it into a tube furnace for high-temperature carbonization to obtain nitrogen-doped carbon nanofibers, and then use sodium borohydride to chemically reduce the nitrogen-doped carbon nanofibers on the nitrogen-doped The carbon nanofiber supports the gold nanoparticle to obtain the nitrogen-doped carbon nanofiber supported gold nanoparticle oxygen reduction catalyst.

[0032] The preparation method of the catalyst is simple, and the oxygen reduction performance is excellent under alkaline conditions. Compared with the Pt catalyst, the catalyst h...

Embodiment 1

[0038] A preparation method of nitrogen-doped carbon nanofiber loaded gold nanoparticle oxygen reduction catalyst, comprising the following steps:

[0039] 1) Pretreatment of bacterial cellulose: Soak bacterial cellulose with deionized water until neutral, and cut into small pieces with a size of 2cm×2cm;

[0040] 2) Bacterial cellulose and polydopamine complex: take step 1) and add 50mL of 0.1mol L to the bacterial cellulose treated -1 In the dopamine aqueous solution, stir and mix evenly in a constant temperature water bath at 50°C, add 20mL of Tri-HCl buffer solution with pH=8.5, make the dopamine polymerize on the bacterial cellulose, and obtain the bacterial cellulose and polydopamine complex;

[0041] 3) Nitrogen-doped carbon nanofibers: freeze-dry the bacterial cellulose and polydopamine complexes obtained in step 2), and put them into a temperature-programmed tube furnace after drying under N 2 Under the protection of 1.5℃·min -1 After carbonization at a heating rate...

Embodiment 2

[0046] A preparation method of nitrogen-doped carbon nanofiber loaded gold nanoparticle oxygen reduction catalyst, comprising the following steps:

[0047] 1) Pretreatment of bacterial cellulose: Soak bacterial cellulose with deionized water until neutral, and cut into small pieces with a size of 2cm×2cm;

[0048] 2) Bacterial cellulose and polydopamine complex: take step 1) and add 50mL of 0.1mol L to the bacterial cellulose treated -1 In the dopamine aqueous solution, stir and mix evenly in a constant temperature water bath at 50°C, add 20mL of Tri-HCl buffer solution with pH=8.5, make the dopamine polymerize on the bacterial cellulose, and obtain the bacterial cellulose and polydopamine complex;

[0049] 3) Nitrogen-doped carbon nanofibers: freeze-dry the bacterial cellulose and polydopamine complexes obtained in step 2), and put them into a temperature-programmed tube furnace after drying under N 2 Under the protection of 1.5℃·min -1 After carbonization at a heating rate...

technical field

[0001] The invention belongs to the field of nanomaterial preparation, and in particular relates to a preparation method and application of a nitrogen-doped carbon nanofiber supported gold nanoparticle oxygen reduction catalyst. Background technique

[0002] The continuous exploitation and use of oil resources has caused energy crisis and environmental pollution, which has become the focus of global attention. At present, scientific research institutions, experts and scholars all over the world are developing and exploring new energy or new energy technologies to make energy and the environment sustainable. Among them, the fuel cell, as an energy conversion device, has attracted people's attention. Fuel cells have the advantages of high energy conversion efficiency, high energy density, green and clean, and have been applied in the power system and power generation system of new energy vehicles.

[0003] The slow oxygen reduction reaction at the fuel cell c...

Examples

preparation example Construction

[0029] Concrete preparation steps are as follows:

[0030] 1) Soak the bacterial cellulose with deionized water until neutral, drain the water, add dopamine solution and stir in a constant temperature water bath at 50°C, then add a Tri-HCl buffer solution with pH=8.5 and continue stirring, and finally obtain bacterial cellulose and Complex of polydopamine.

[0031] 2) freeze-dry the composite of bacterial cellulose and polydopamine, put it into a tube furnace for high-temperature carbonization to obtain nitrogen-doped carbon nanofibers, and then use sodium borohydride to chemically reduce the nitrogen-doped carbon nanofibers on the nitrogen-doped The carbon nanofiber supports the gold nanoparticle to obtain the nitrogen-doped carbon nanofiber supported gold nanoparticle oxygen reduction catalyst.

[0032] The preparation method of the catalyst is simple, and the oxygen reduction performance is excellent under alkaline conditions. Compared with the Pt catalyst, the catalyst h...

Embodiment 1

[0038] A preparation method of nitrogen-doped carbon nanofiber loaded gold nanoparticle oxygen reduction catalyst, comprising the following steps:

[0039] 1) Pretreatment of bacterial cellulose: Soak bacterial cellulose with deionized water until neutral, and cut into small pieces with a size of 2cm×2cm;

[0040] 2) Bacterial cellulose and polydopamine complex: take step 1) and add 50mL of 0.1mol L to the bacterial cellulose treated -1 In the dopamine aqueous solution, stir and mix evenly in a constant temperature water bath at 50°C, add 20mL of Tri-HCl buffer solution with pH=8.5, make the dopamine polymerize on the bacterial cellulose, and obtain the bacterial cellulose and polydopamine complex;

[0041] 3) Nitrogen-doped carbon nanofibers: freeze-dry the bacterial cellulose and polydopamine complexes obtained in step 2), and put them into a temperature-programmed tube furnace after drying under N 2 Under the protection of 1.5℃·min -1 After carbonization at a heating rate...

Embodiment 2

[0046] A preparation method of nitrogen-doped carbon nanofiber loaded gold nanoparticle oxygen reduction catalyst, comprising the following steps:

[0047] 1) Pretreatment of bacterial cellulose: Soak bacterial cellulose with deionized water until neutral, and cut into small pieces with a size of 2cm×2cm;

[0048] 2) Bacterial cellulose and polydopamine complex: take step 1) and add 50mL of 0.1mol L to the bacterial cellulose treated -1 In the dopamine aqueous solution, stir and mix evenly in a constant temperature water bath at 50°C, add 20mL of Tri-HCl buffer solution with pH=8.5, make the dopamine polymerize on the bacterial cellulose, and obtain the bacterial cellulose and polydopamine complex;

[0049] 3) Nitrogen-doped carbon nanofibers: freeze-dry the bacterial cellulose and polydopamine complexes obtained in step 2), and put them into a temperature-programmed tube furnace after drying under N 2 Under the protection of 1.5℃·min -1 After carbonization at a heating rate...

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