Preparation method, product and application of a hollow carbon sphere composite with iron-cobalt-platinum-loaded three-dimensional mesh surface
A three-dimensional mesh, hollow carbon sphere technology, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as poisoning of non-platinum materials, no significant reduction in the actual use of platinum, and decreased catalyst activity.
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Embodiment 1
[0021](1) The silica ball SiO wrapped in a carbon nitrogen complex was prepared according to the improved prior art (Kuang Sheng et al 2020 J. Electrochem. SOC.167: 070560) 2 @ @: First, silica nanospheres were prepared: 120 ml of water, 280 ml of ethanol and 14 ml of concentrated concentrated ammonia were mixed, and 18 ml of tetraethyl silicate was added dropwise under stirring. After the addition was completed, stirring was stirred for 3 hours, the resulting solid centrifugally, Wash each other three times with water and ethanol at 60 o The vacuum is dried under vacuum for 12 hours, the grinding is uniform, resulting in a silica ball having a particle diameter of about 250 nm; then the silica ball ultrasound is dispersed in ethanol, and the concentration is 30 mmol L is added to the continuous stirring. -1 The trihymethylmethylmethane buffer solution forms a uniform dispersion, and nitrogen gas is introduced into the dispersion, and the concentration is 40 mmol L. -1 Dopamine so...
Embodiment 2
[0029] Steps (1), (2), (3) are the same as steps (1), (2), (3) in Example 1;
[0030] (4) 25 mg of acetylacetonate and 5.5 mg of acetylacetonate iron C 15 Hide 21 Feo 6 Dissolve in ethanol, form a uniform solution; then add 3.7 g of the above SiO 2 @ 3D-C-N, the resulting mixture was stirred at room temperature for 30 min, continued to be heated to 70 under constant stirring o C and maintained 2 h; finally evaporated to ethanol, vacuum dry at room temperature, the resulting solid transferred to the tube furnace, in a nitrogen atmosphere o C MIN -1 Speed heating to 900 o C and maintain 2 h at this temperature; cooled to room temperature to obtain a silicon dioxide ball wrapped in a black solid as iron-cobalt-nitrogen-doped three-dimensional mesh carbon layer wrapped in a silica ball SiO 2 @ 3D-C-N / FECO;
[0031] Step (5), (6) are the same as step (5) of Example 1; (6);
[0032] The test process of step (7) is the same as step (7) of Embodiment 1. The result is: oxygen reduction...
Embodiment 3
[0034] Steps (1), (2), (3) are the same as steps (1), (2), (3) in Example 1;
[0035] (4) 75 mg of porphyrin cobalt and 11 mg phthalocyanine sub-ferrous is dissolved in ethanol to form a uniform solution state; subsequent addition of 3.7 g of SiO 2 @ 3D-C-N, the resulting mixture was stirred at room temperature for 30 min, continued to be heated to 70 under constant stirring o C and maintained 2 h; finally evaporated to ethanol, vacuum dry at room temperature, the resulting solid transferred to the tube furnace, in a nitrogen atmosphere o C MIN -1 Speed heating to 900 o C and maintain 2 h at this temperature; cooled to room temperature to obtain a silicon dioxide ball wrapped in a black solid as iron-cobalt-nitrogen-doped three-dimensional mesh carbon layer wrapped in a silica ball SiO 2 @ 3D-C-N / FECO;
[0036] Step (5), (6) are the same as step (5) of Example 1; (6);
[0037] The test process of step (7) is the same as step (7) of Embodiment 1. The result is: oxygen reduction...
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