Fe/Fe3C embedded N-doped carbon composite material, preparation method thereof and application thereof in microbial fuel cells

Abstract

The invention discloses a Fe / Fe3C embedded N-doped carbon composite material, a preparation method thereof and application thereof in a microbial fuel cell. The Fe / Fe3C embedded N-doped carbon composite material serves as a cathode catalyst. The preparation method comprises the following steps: by taking graphene oxide as a substrate, chitosan as a nitrogen-doped precursor and ferric trichloride hexahydrate and terephthalic acid as precursors, performing solvothermal reaction, performing high-temperature pyrolysis, and calcining in an argon atmosphere to obtain the Fe / Fe3C embedded N-doped carbon composite material Fe / Fe3C / NC. The Fe / Fe3C embedded N-doped carbon composite material Fe / Fe3C / NC synthesized through a series of steps has good electricity generation performance in a microbial fuel cell as a cathode catalyst, and has great research significance and a certain application prospect in development of novel sustainable development energy.

Description

technical field

[0001] The invention belongs to microbial fuel cell technology and relates to Fe / Fe 3 C-intercalated N-doped carbon composite material, its preparation method and its application as a cathode catalyst in microbial fuel cells. Background technique

[0002] With the rapid development of modern science and technology and civilization, the population is increasing year by year, and the energy consumption is increasing day by day. At the same time, the environmental pollution caused by energy consumption also poses a certain threat to the survival and development of human beings and nature. People are concerned about the energy crisis. It is also increasingly concerned that actively seeking or developing new sustainable energy production technologies is a top priority.

[0003] Microbial fuel cell (MFC) uses the metabolism of microorganisms to directly convert the chemical energy in organic wastewater into electrical energy, thereby realizing the generation of el...

Examples

Embodiment 1

[0034] The preparation of Fe framework, specific steps are as follows:

[0035] 0.675 g FeCl 3 ·6H 2 O and 0.207 g of terephthalic acid were dispersed in 15 mL of DMF, followed by routine sonication for 20 min. The obtained solution was poured into a 50 mL reaction kettle, moved to an oven, and heated to 110 °C for 20 h. Finally, the product was centrifuged and washed with DMF and hot ethanol, and dried under vacuum at 60 °C to obtain the Fe framework. attached figure 1 TEM image of the Fe frame, attached figure 2is the SEM image of the Fe frame. It can be seen from the figure that the as-prepared Fe framework presents a concave octahedral morphology with a uniform size of about 500 nm and a smooth surface.

Embodiment 2

[0037] The preparation of Fe / GO / CS composites, the specific steps are as follows:

[0038] using the in situ growth method. Disperse 0.03 g of carbon-based material graphene oxide and 0.1 g of nitrogen source chitosan in 15 mL of DMF and routinely sonicate for 1 h; then add 0.675 g of FeCl 3 ·6H 2 O and 0.207 g terephthalic acid, and sonicated for 20 min; the resulting solution was then transferred to a reaction kettle and heated to 110 °C for 20 h; finally, the product was centrifuged and washed with DMF and hot ethanol, and Dry at 60°C to obtain Fe / GO / CS composite. attached image 3 is the TEM image of the Fe / GO / CS composite, with Figure 4 It is the SEM image of the Fe / GO / CS composite, the surface becomes relatively rough after the composite is formed.

Embodiment 3

[0040] The difference between this embodiment and the above-mentioned Example 2 is that: the carbon-based material is carbon nanotubes, and the others are the same as in Example 2 to obtain a Fe / CN / CS composite.

technical field

[0001] The invention belongs to microbial fuel cell technology and relates to Fe / Fe 3 C-intercalated N-doped carbon composite material, its preparation method and its application as a cathode catalyst in microbial fuel cells. Background technique

[0002] With the rapid development of modern science and technology and civilization, the population is increasing year by year, and the energy consumption is increasing day by day. At the same time, the environmental pollution caused by energy consumption also poses a certain threat to the survival and development of human beings and nature. People are concerned about the energy crisis. It is also increasingly concerned that actively seeking or developing new sustainable energy production technologies is a top priority.

[0003] Microbial fuel cell (MFC) uses the metabolism of microorganisms to directly convert the chemical energy in organic wastewater into electrical energy, thereby realizing the generation of el...

Examples

Embodiment 1

[0034] The preparation of Fe framework, specific steps are as follows:

[0035] 0.675 g FeCl 3 ·6H 2 O and 0.207 g of terephthalic acid were dispersed in 15 mL of DMF, followed by routine sonication for 20 min. The obtained solution was poured into a 50 mL reaction kettle, moved to an oven, and heated to 110 °C for 20 h. Finally, the product was centrifuged and washed with DMF and hot ethanol, and dried under vacuum at 60 °C to obtain the Fe framework. attached figure 1 TEM image of the Fe frame, attached figure 2is the SEM image of the Fe frame. It can be seen from the figure that the as-prepared Fe framework presents a concave octahedral morphology with a uniform size of about 500 nm and a smooth surface.

Embodiment 2

[0037] The preparation of Fe / GO / CS composites, the specific steps are as follows:

[0038] using the in situ growth method. Disperse 0.03 g of carbon-based material graphene oxide and 0.1 g of nitrogen source chitosan in 15 mL of DMF and routinely sonicate for 1 h; then add 0.675 g of FeCl 3 ·6H 2 O and 0.207 g terephthalic acid, and sonicated for 20 min; the resulting solution was then transferred to a reaction kettle and heated to 110 °C for 20 h; finally, the product was centrifuged and washed with DMF and hot ethanol, and Dry at 60°C to obtain Fe / GO / CS composite. attached image 3 is the TEM image of the Fe / GO / CS composite, with Figure 4 It is the SEM image of the Fe / GO / CS composite, the surface becomes relatively rough after the composite is formed.

Embodiment 3

[0040] The difference between this embodiment and the above-mentioned Example 2 is that: the carbon-based material is carbon nanotubes, and the others are the same as in Example 2 to obtain a Fe / CN / CS composite.

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