Cobalt tetraphosphide with core-shell structure as well as preparation method and application thereof
A core-shell structure, cobalt phosphide technology, applied in phosphide, structural parts, nanotechnology for materials and surface science, etc., can solve the problems reflecting the excellent performance of battery materials
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[0027] An embodiment of the present invention provides a method for preparing cobalt tetraphosphide with a core-shell structure, which includes:
[0028] S1. Solvothermally react the cobalt solution at 150~160°C, cool and centrifuge after the reaction to obtain the first powder;
[0029] S2. Mix the first powder with water to make a suspension, conduct a hydrothermal reaction on the suspension at 150-160°C, cool and centrifuge after the reaction to obtain the second powder;
[0030] S3. Mix the second powder with red phosphorus according to the cobalt-phosphorus atomic ratio of 1:4~4.2, and mix it under a vacuum degree of 5×10 -4 ~8×10 -4 Under the condition of Pa, the temperature is slowly increased from room temperature to 950~1000℃ for reaction;
[0031] Wherein, the cobalt solution is obtained by mixing cobalt chloride hexahydrate and an organic solvent, and the organic solvent is obtained by mixing glycerol and isopropanol.
[0032] The present invention is an improvem...
Embodiment 1
[0041] This embodiment provides a kind of cobalt tetraphosphide with core-shell structure, and its preparation method is as follows:
[0042] S1. Measure 15 mL of glycerol and 50 mL of isopropanol with a graduated cylinder and add them in turn to a 100 mL beaker with magnetic stirring to mix evenly; weigh 4 mmol of cobalt chloride hexahydrate and pour it into the above mixed organic solvent and stir evenly to obtain rose red cobalt solution.
[0043] S2. The above cobalt solution was subjected to solvothermal reaction at 160°C for 5 h. After the reaction was completed, it was cooled to room temperature, centrifuged, washed with ethanol and dried at room temperature to obtain the first powder (the scanning electron microscope picture is shown in figure 1 shown).
[0044] S3. The first powder was mixed with 70 mL of water to make a suspension, and the suspension was subjected to a hydrothermal reaction at 150°C for 5 hours. After the reaction was completed, it was cooled to roo...
Embodiment 2
[0047] This embodiment provides a kind of cobalt tetraphosphide with core-shell structure, and its preparation method is as follows:
[0048] S1. Measure 15 mL of glycerol and 45 mL of isopropanol with a graduated cylinder, add them in turn to a 100 mL beaker and mix them uniformly with magnetic force; weigh 3 mmol of cobalt chloride hexahydrate and pour them into the above mixed organic solvent and stir evenly to obtain rose red cobalt solution.
[0049] S2. The above cobalt solution was subjected to solvothermal reaction at 160°C for 5 h, cooled to room temperature after the reaction, centrifuged, washed with ethanol and dried at room temperature to obtain the first powder.
[0050] S3. The first powder was mixed with 60 mL of water to make a suspension, and the suspension was subjected to a hydrothermal reaction at 160°C for 5 hours. After the reaction was completed, it was cooled to room temperature, centrifuged, washed with water and dried at room temperature to obtain S...
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