Cerium-modified nickel-based catalyst as well as preparation method and application thereof
A nickel-based catalyst and nickel salt technology, applied in the field of nanomaterials, can solve the problems of affecting hydrogen production efficiency and slow hydrogen production efficiency, and achieve the effects of promoting kinetic process, improving efficiency and low cost
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[0030] The modification of nickel-based catalyst materials by those skilled in the art has technical difficulties with poor stability. Therefore, the loaded modification materials are few and easy to fall off, and the efficiency of the modified nickel-based catalyst materials in the process of electrolysis of water needs to be improved. , a preparation method of a cerium-modified nickel-based catalyst material is provided, comprising the following steps:
[0031] S1. use nickel salt as raw material, use conductive substrate as carrier, and use urea and ammonium fluoride as structure-directing agent to carry out hydrothermal reaction to obtain nickel hydroxide precursor;
[0032] S2. In a nitrogen-containing atmosphere, the nickel hydroxide precursor is calcined to form a nickel-based catalyst material, that is, a conductive substrate loaded with nickel nitride;
[0033] S3. The nickel-based catalyst material is placed in an electrolyte solution containing cerium, and an electr...
Embodiment 1
[0047] A cerium-modified nickel-based catalyst material is loaded with CeO 2 Ni 3 N nanosheets, the preparation method is as follows:
[0048] S1. Dissolve 1mmol / L nickel nitrate, 5mmol / L urea and 2mmol ammonium fluoride in 35ml deionized water, stir for 30min, immerse nickel foam in the above mixed solution, heat to 120°C for reaction for 6h, take out after reaction The nickel foam was washed three times with deionized water and then dried to obtain a nickel hydroxide precursor.
[0049] S2. The obtained nickel hydroxide precursor is placed on a porcelain boat, and placed in a tube furnace, and then calcined after passing in ammonia gas to obtain a nickel-based catalyst material, wherein the heating rate is 5°C / min, and the reaction temperature is 300°C , the holding time is 30min.
[0050] S3. The obtained nickel-based catalyst material is placed in a cerium sulfate electrolyte, and reacted in a three-electrode system to obtain a cerium-modified nickel-based catalyst mate...
Embodiment 2
[0052] A cerium-modified nickel-based catalyst material is loaded with CeO 2 Ni 3 N nanosheets, the preparation method is as follows:
[0053] S1. Dissolve 2mmol / L of nickel sulfate, 7mmol / L of urea and 3mmol of ammonium fluoride in 28ml of deionized water, stir for 60min, immerse the carbon cloth in the solution, heat to 100°C for 8h reaction, take out the carbon cloth after the reaction Wash with deionized water for 3 times and then dry to obtain nickel hydroxide precursor;
[0054] S2. the obtained nickel hydroxide precursor is placed on a porcelain boat, and placed in a tube furnace, and calcined after being introduced into nitrogen to obtain a nickel-based catalyst material, wherein the heating rate is 10 ℃ / min, and the reaction temperature is 400 ℃, The holding time is 60min;
[0055] S3. The obtained nickel-based catalyst material is placed in a cerium nitrate electrolyte and reacted in a three-electrode system to obtain a cerium-modified nickel-based catalyst materi...
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