Nitrogen-doped carbon nanotube-loaded nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst and preparation method and application thereof

[0033] Example 1: Nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst supported by nitrogen-doped carbon nanotubes (Fe 1.2 Co@NC / NCNTs) synthesis:

[0034] (1) Pretreatment of carbon nanotubes:

[0035] Dissolve 100 mg of carbon nanotubes (CNTs) in 10 mL of acetone, stir at room temperature for 3 h, wash and dry; add the dried CNTs into the flask, and then add 100 mL of 10% HNO with a volume ratio of 2:1 3 and 10%H 2 o 2 Mixed solution, start stirring, heat up to 60°C, reflux and stir for 5h, suction filter after cooling, wash the filter cake with deionized water until neutral, dry in a vacuum oven at 50°C to constant weight, and dry the functional The NaCNTs samples were ground for later use.

[0036] (2) Grafting reaction of iron-cobalt organic ligands and melamine on the surface of functionalized carbon nanotubes:

[0037] Under the condition of stirring, 50 mg of FePc (ferric phthalocyanine) and 50 mg of CoPc (cobalt phthalocyanine) were ultrasonicall...

[0064] Example 2: Nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst supported by nitrogen-doped carbon nanotubes (Fe 2.8 Co@NC / NCNTs) synthesis:

[0065] (1) Pretreatment of carbon nanotubes:

[0066] Dissolve 200 mg of carbon nanotubes (CNTs) in 10 mL of acetone, stir at room temperature for 5 h, wash and dry; add the dried CNTs into the flask, and then add 100 mL of 10% HNO with a volume ratio of 3:1 3 and 35%H 2 o 2 Mixed liquid, start stirring, heat up to 80°C, reflux and stir for 5h, suction filter after cooling, wash the filter cake with deionized water until neutral, dry in a vacuum oven at 80°C to constant weight, and dry the functional The NaCNTs samples were ground for later use.

[0067] (2) Grafting reaction of iron-cobalt organic ligands and melamine on the surface of functionalized carbon nanotubes:

[0068] Under the condition of stirring, 100 mg of FePc (ferric phthalocyanide) and 30 mg of CoPc (cobalt phthalocyanine) materials were ultr...

[0073] Example 3: Nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst supported by nitrogen-doped carbon nanotubes (FeCo 2.5 @NC / NCNTs) synthesis:

[0074] (1) Pretreatment of carbon nanotubes:

[0075] Dissolve 50 mg of carbon nanotubes (CNTs) in 5 mL of acetone, stir at room temperature for 3 h, wash and dry; add the dried CNTs into the flask, and then add 50 mL of 5% HNO with a volume ratio of 2:1 3 and 10%H 2 o 2 Mixed solution, start stirring, heat up to 60°C, reflux and stir for 3h, suction filter after cooling, wash the filter cake with deionized water until neutral, dry in a vacuum oven at 50°C to constant weight, and dry the functional The NaCNTs samples were ground for later use.

[0076] (2) Grafting reaction of iron-cobalt organic ligands and melamine on the surface of functionalized carbon nanotubes:

[0077] Under the condition of stirring, 30mg of FePc (ferric phthalocyanine) and 100mg of CoPc (cobalt phthalocyanine) materials were ultrason...