Three-dimensional ordered macroporous perovskite material 3dom-smcoo 3 And its preparation method and application
A perovskite material, 3dom-smcoo3 technology, applied in the direction of material electrochemical variables, chemical instruments and methods, cobalt compounds, etc., can solve the problems of unfavorable catalytic performance of materials and lower specific surface area
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Embodiment 1
[0030] Embodiment 1: the preparation of PMMA template:
[0031] The preparation of PMMA template was synthesized according to the method described by Ha et al. ). The specific steps are: firstly weigh 0.075g of potassium persulfate, 100g of deionized water and 200g of methanol and mix them into a 500mL three-necked flask, and heat it to 70°C with a stirring speed of 150rpm, and then add 10g of methyl methacrylate after the temperature is constant. Esters, reflux, N 2 The atmosphere is protected, and the stirring is continued for 5h. Finally, transfer the milky white mixed solution to a 50mL centrifuge tube and centrifuge at a speed of 3000rpm for 2h, and then place it in a vacuum oven (50°C) for 24h to obtain a PMMA template with a size of about 750-800nm (such as figure 1 shown).
Embodiment 2
[0032] Example 2: 3DOM-SmCoO with a pore size of 400-520nm 3 Preparation of materials:
[0033] First weigh 0.025mol of Sm(NO 3 ) 3 ·6H 2 O and 0.025mol of Co(NO 3 ) 2 ·6H 2 O in a 100 mL beaker, add 12 mL of ethylene glycol and stir for 2 h, then add 6 mL of methanol solution so that the final solution volume is 25 mL (that is, the total metal ion concentration is 2mol), then get about 2 g of the PMMA prepared in Example 1 The template is soaked in this solution for 3 hours. Finally, the excess solution was filtered off with suction, and dried overnight at room temperature to obtain a precursor with a template, and then the precursor was placed in a common muffle furnace, and the temperature was raised to 600 °C at a rate of 1 °C / min, and calcined 5h, finally down to room temperature naturally. 3DOM-SmCoO with three-dimensional ordered macroporous structure prepared in this example 3 The diameter of the macropore is 400-520nm, and the diameter of the mesopore on the ...
Embodiment 3
[0034] Example 3: 3DOM-SmCoO with a pore size of 520-600 nm 3 Preparation of materials:
[0035] First weigh 0.03mol of Sm(NO 3 ) 3 ·6H 2 O and 0.03mol of Co(NO 3 ) 2 ·6H 2 O in a 100mL beaker, add 10mL of ethylene glycol and stir for 2h, then add 8mL of methanol solution so that the final solution volume is 25mL (that is, the total metal ion concentration is 2.4mol), then get about 3g of the PMMA prepared in Example 1 The template is soaked in this solution for 4 hours. Finally, the excess solution was filtered off with suction, and dried overnight at room temperature to obtain a precursor with a template, and then the precursor was placed in a tube furnace with an inner diameter of 44mm, with an air flow rate of 60ml / min, 1.2℃ / The heating rate was raised to 700°C for 1 min, and then calcined at a constant temperature for 4 h, and finally dropped to room temperature naturally. 3DOM-SmCoO with three-dimensional ordered macroporous structure prepared in this example 3...
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