Preparation method and application of hollow mesoporous structure NiCoS polyhedron
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A technology of mesoporous structure and polyhedron, which is applied in the field of preparation of hollow mesoporous structure NiCoS polyhedron, can solve the problems of poor activity and high cost of electrocatalyst, and achieve high activity effect
Inactive Publication Date: 2018-02-27
HARBIN INST OF TECH
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[0005] The purpose of the present invention is to solve the current problems of high cost and poor activity of electrocatalysts, and provide a method for preparing a hollow mesoporous structure NiCoS polyhedron and its application. The method uses ZIF-67 as a template, through hydrothermal and calcination method to prepare NiCoS polyhedral structure with hollow mesoporous structure, and has good electrocatalytic activity and stability in alkaline solution
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specific Embodiment approach 1
[0027] Specific embodiment 1: This embodiment describes a method for preparing a hollow mesoporous structure NiCoS polyhedron, such as figure 1 As shown, the method steps are as follows:
[0028] Step 1: Dissolve 3.495g divalent cobalt salt in 120mL methanol (AR, 99.5%), dissolve 3.942g 2-methylimidazole in 40mL methanol (AR, 99.5%), mix and stir the two solutions obtained , static, to get ZIF-67 (zeolite imidazolate skeleton-67);
[0029] Step 2: Mix and stir ZIF-67 prepared in step 1 with nickel nitrate, centrifuge for 10 minutes at a speed of 10,000 r / min, and dry in vacuum for 12 hours to obtain the intermediate ZIF-67 / NiCo double-layer hydroxide (NiCo- LDH), such as figure 2 , image 3 shown;
[0030] Step 3: Disperse the intermediate ZIF-67 / NiCo double-layer hydroxide obtained in step 2 in 20 mL of ethanol solution, add 0.06 g of thioacetamide for stirring, and then place it in a reactor for hydrothermal reaction. The heating temperature is 120°C, the hydrothermal...
specific Embodiment approach 2
[0031] Specific embodiment two: a method for preparing a hollow mesoporous structure NiCoS polyhedron described in specific embodiment one, in step one, the divalent cobalt salt is Co(NO 3 ) 2 •6H 2 O. CoSO 4 •H 2 O, CoCl 2 •6H 2 O or Co(CH 3 COO) 2 • 4H 2 O.
specific Embodiment approach 3
[0032] Embodiment 3: The method for preparing a hollow mesoporous NiCoS polyhedron described in Embodiment 1, in step 1, the molar mass ratio of the divalent cobalt salt to 2-methylimidazole is 1:4.
[0033] Embodiment 4: In the method for preparing a hollow mesoporous NiCoS polyhedron described in Embodiment 1, in step 1, the resting time should be 24 hours.
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Abstract
The invention provides a preparation method and application of a hollow mesoporous structure NiCoS polyhedron, and belongs to the technical field of clean energy preparation. The preparation method comprises the following steps that 1, divalent cobalt salt and 2-methylimidazole are dissolved in a methanol solution and then subjected to still standing, and ZIF-67 is obtained; 2, the ZIF-67 and nickel nitrate are mixed and stirred and then subjected to centrifugation and vacuum drying, and a middle body ZIF-67 / NiCo-LDH is obtained; and 3, the middle body is dispersed in an ethanol solution, thenthioacetamide is added for stirring, a mixed solution is placed in a reaction kettle for hydrothermal reaction, precipitation obtained after reaction is subjected to centrifugal washing and vacuum drying and then calcined in the protective atmosphere, and the hollow mesoporous structure NiCoS polyhedron is obtained. The preparation method of the hollow mesoporous structure NiCoS polyhedron has the advantages that the method is simple, going green and environmentally friendly, low in cost and easy to operate and control, and the preparation method is suitable for industrialized continuous large-scale production; and a raw material involved in the preparation method is environmentally friendly, low in price and excellent in performance, and large-scale application is expected to achieve.
Description
technical field [0001] The invention belongs to the technical field of clean energy preparation, and in particular relates to a preparation method and application of a hollow mesoporous structure NiCoS polyhedron. Background technique [0002] With the rapid development of human living standards, people's demand for energy continues to grow, and energy problems follow. As the most ideal clean energy in the 21st century, hydrogen has gradually attracted the attention of scientists all over the world. Electrolyzed water technology is based on the principle of electrochemical water splitting, using renewable electric energy or solar energy to drive water splitting into hydrogen and oxygen, which is considered to be the most promising and sustainable way to produce hydrogen. However, the hydrogen production technology by electrolysis of water requires highly active and stable hydrogen evolution and oxygen evolution catalysts to make the electrolysis reaction economical and ener...
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