A kind of preparation method and application of bowknot-shaped cobalt tetroxide
A technology of tricobalt tetroxide and bow tie, which is applied in the direction of structural parts, electrochemical generators, electrical components, etc., to achieve the effects of uniform particles, good cycle life and high purity
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Embodiment 1
[0026] Dissolve 2mmol of cobalt nitrate and 4mmol of terephthalic acid in a mixed solution of 10ml of N,N dimethylformamide and 30ml of deionized water, and stir to obtain a uniform solution. Put the above homogeneous solution into a hydrothermal reaction kettle and seal it, keep it warm at 150°C for 24 hours, wash the obtained product with 20mL of deionized water, centrifuge at 5000r / min for 10min to obtain a solid, repeat the above washing process three times; in the obtained solid Add 20ml of absolute ethanol for dehydration to obtain a precursor of tricobalt tetroxide. The obtained precursor was calcined at 300° C. for 10 h in an air atmosphere with a heating rate of 5° C. / min to obtain a bowtie-shaped cobalt tetroxide.
Embodiment 2
[0028] Dissolve 3 mmol of cobalt acetate hexahydrate and 8 mmol of terephthalic acid in a mixed solution of 20 ml of N,N dimethylformamide and 20 ml of deionized water, and stir to obtain a uniform solution. Put the above homogeneous solution into a hydrothermal reaction kettle and seal it, keep it warm at 150°C for 24 hours, wash the obtained product with 20mL of deionized water, centrifuge at 5000r / min for 10min to obtain a solid, repeat the above washing process three times; in the obtained solid Add 20ml of absolute ethanol for dehydration to obtain a precursor of tricobalt tetroxide. The obtained precursor was calcined at 300° C. for 10 h in an air atmosphere with a heating rate of 5° C. / min to obtain a bowtie-shaped cobalt tetroxide. figure 1 The bowtie-shaped cobalt tetroxide scanning electron microscope (SEM) spectrum synthesized for this example shows that the formed cobalt tetroxide has a bowtie-like structure with a particle size of about 5 μm.
Embodiment 3
[0030] Dissolve 8 mmol cobalt oxalate and 12 mmol terephthalic acid in a mixed solution of 30 ml ethylene glycol and 10 ml deionized water, and stir to obtain a uniform solution. Put the prepared homogeneous solution into a hydrothermal reaction kettle and seal it, keep it warm at 200°C for 2 hours, wash the obtained product with 20mL of deionized water, centrifuge at 7000r / min for 5min to obtain a solid, repeat the above washing process three times; the obtained solid Add 20ml of absolute ethanol to dehydrate to obtain the precursor of tricobalt tetroxide. The obtained precursor was calcined at 600° C. for 1 h in an air atmosphere with a heating rate of 10° C. / min to obtain a bowtie-shaped cobalt tetroxide. figure 2 The X-ray diffraction (XRD) of bowtie-shaped cobalt tetroxide synthesized in this example can be seen from the figure that the present invention can prepare pure phase cobalt tetroxide without impurity phase through a simple method.
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