A hollow ldh/mno 2 Nanocage composite material and its preparation method and application
A composite material, nano-cage technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low discharge capacity, easy stacking, and inability to achieve high capacity of lithium-air batteries. The effect of large specific surface area, improved battery performance, and excellent catalytic activity
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Embodiment 1
[0052] A Hollow NiCo LDH / MnO 2 The preparation method of nano cage composite material, comprises steps as follows:
[0053] (1) Add 0.728g of cobalt nitrate hexahydrate and 0.821g of 2-methylimidazole into 20mL of methanol respectively, and ultrasonically vibrate for 5 minutes to obtain a methanol solution of cobalt nitrate and a methanol solution of 2-methylimidazole, and 2-methylimidazole The methanol solution of cobalt nitrate was added to the methanol solution of cobalt nitrate and mixed evenly. The resulting mixed solution was aged at room temperature for 24 hours, and the precipitate was collected by centrifugation. The obtained precipitate was washed with methanol three times, and dried at 60°C for 12 hours to obtain ZIF-67.
[0054] (2) 0.1g ZIF-67 and 0.5g nickel nitrate are added in 20mL ethanol respectively, ultrasonic vibration 10min, obtain ZIF-67 dispersion liquid and nickel nitrate dispersion liquid, nickel nitrate dispersion liquid is added in ZIF-67 dispersion...
Embodiment 2
[0067] A Hollow CoCo LDH / MnO 2 The preparation method of nano cage composite material, comprises steps as follows:
[0068] (1) Described with embodiment 1 step (1).
[0069] (2) 0.1g ZIF-67 and 0.5g cobalt nitrate are added in 20mL methanol respectively, ultrasonic vibration 10min, obtain ZIF-67 dispersion liquid and cobalt nitrate dispersion liquid, cobalt nitrate dispersion liquid is added in ZIF-67 dispersion liquid, in The reaction was continuously stirred in a water bath at 60° C. for 1 h, the precipitate was collected by centrifugation, washed with ethanol three times, and dried at 60° C. for 12 h to obtain the CoCoLDH material.
[0070] (3) Add 70mg CoCo LDH material to 20mL 0.03mol / L KMnO 4 solution, stirred and mixed for 1 h, transferred the resulting mixture to a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, and reacted hydrothermally at 160 °C for 3 h; after the reaction was completed, centrifuged, and the centrifuged precipitate was washed three...
Embodiment 3
[0074] A Hollow CuCo LDH / MnO 2 The preparation method of nano cage composite material, comprises steps as follows:
[0075] (1) Described with embodiment 1 step (1).
[0076] (2) Add 0.1g ZIF-67 and 0.5g cupric chloride into 20mL ethanol respectively, and oscillate ultrasonically for 10min to obtain ZIF-67 dispersion and cupric chloride dispersion, and add cupric chloride dispersion to ZIF-67 dispersion In 60 °C water bath, the reaction was continuously stirred for 1 h, the precipitate was collected by centrifugation, the obtained precipitate was washed with ethanol three times, and dried at 60 °C for 12 h to obtain the CuCoLDH material.
[0077] (3) Add 70mg CuCo LDH material to 20mL 0.03mol / L KMnO 4 solution, stirred and mixed for 1 h, transferred the resulting mixture to a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, and reacted hydrothermally at 160 °C for 3 h; after the reaction was completed, centrifuged, and the centrifuged precipitate was washed thr...
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