A nickel-molybdate-carbon composite nanosphere, its preparation method and its application as a hydrogen evolution catalyst for electrolysis of water
A nanosphere and carbon composite technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of improving hydrogen evolution activity and strict catalyst preparation conditions, etc. Achieve the effect of improving electrical conductivity, good catalytic activity for hydrogen evolution of electrolyzed water, and strong repeatability
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Embodiment 1
[0028] 1) preparation concentration is the nickel benzoate methanol solution of 0.4mol / L, the sodium molybdate aqueous solution of preparation 0.1mol / L;
[0029] 2) Slowly add the sodium molybdate aqueous solution with a volume ratio of 1:3 into the nickel benzoate methanol solution, stir at 60°C for 24h, then continue to stir and react at 90°C for 3h, vacuum filter, wash and dry after the reaction , to obtain product A;
[0030] 3) ultrasonically disperse 60 mg of product A in 200 mL of 2-hydroxy-5-methylacetanilide aqueous solution with a concentration of 0.04 mol / L, stir at normal temperature and pressure for 12 hours, filter, wash, and dry to obtain product B;
[0031] 4) The product B was calcined at 700° C. for 2 h under an argon atmosphere to obtain nickel molybdate carbon composite nanospheres.
[0032] see figure 1 , figure 1 The scanning electron microscope picture of the nickel molybdate carbon composite nanosphere prepared for the present invention; it can be se...
Embodiment 2
[0036] 1) preparation concentration is the 2,4-dihydroxybenzoic acid nickel methanol solution of 0.1mol / L, the ammonium molybdate aqueous solution of preparation 0.05mol / L;
[0037] 2) Slowly add the ammonium molybdate aqueous solution with a volume ratio of 1:1 to the 2,4-dihydroxybenzoic acid nickel methanol solution dropwise, stir at 60°C for 10h, then continue to stir and react at 90°C for 1h, after the reaction is completed, vacuum pump Filter, wash and dry to obtain product A;
[0038] 3) ultrasonically disperse 30 mg of product A in 100 mL of 3-(dibutylamino)phenol aqueous solution with a concentration of 0.01 mol / L, stir for 7 hours at normal temperature and pressure, filter, wash, and dry to obtain product B;
[0039] 4) Calcining the product B at 500° C. for 2 h under an argon atmosphere to obtain nickel molybdate carbon composite nanospheres.
Embodiment 3
[0041] 1) preparation concentration is the nickel benzoate methanol solution of 0.2mol / L, the sodium molybdate aqueous solution of preparation 0.07mol / L;
[0042] 2) Slowly add the sodium molybdate aqueous solution with a volume ratio of 1:2 to the nickel benzoate methanol solution dropwise, stir at 50°C for 20h, then continue to stir and react at 80°C for 2h, after the reaction is completed, vacuum filter, wash and dry to obtain Product A;
[0043] 3) Ultrasonic disperse 45 mg of product A in 150 mL of 4-(2-aminoethyl)-1,2-benzenediol aqueous solution with a concentration of 0.02 mol / L, stir for 10 h at normal temperature and pressure, filter, wash, and dry Product B is obtained;
[0044] 4) The product B was calcined at 600° C. for 2 h under an argon atmosphere to obtain nickel molybdate carbon composite nanospheres.
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