A kind of mulberry-shaped nis/ni composite nanoparticle and its preparation method and application
A composite nanoparticle and nanoparticle technology, which is applied in the field of catalyst preparation, can solve the problems of poor electrochemical stability, large hydrogen evolution overpotential, and large Tafel slope, etc., and achieve the goal of improving catalytic performance, optimizing hydrogen evolution activity, and good catalytic activity. Effect
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Embodiment 1
[0034] A preparation method of mulberry-shaped NiS / Ni composite nanoparticles, comprising the following steps:
[0035] Step 1: Add nickel sulfate and ammonium persulfate into deionized water according to the molar ratio of 4:1, and mix evenly by ultrasonic to obtain a mixed solution A with a nickel ion concentration of 0.33M; add it according to the volume ratio of mixed solution A to ammonia water at 12:1 Ammonia, mixed evenly to obtain a mixed solution B, put 5 pieces of carbon cloth into the mixed solution B, and let it stand for 20 minutes for the growth of the nickel hydroxide precursor. After the reaction, take out the carbon cloth, wash it with deionized water, and dry it naturally;
[0036] Step 2: Put the carbon cloth loaded with nickel hydroxide obtained in step 1 into a 50ml reactor liner, add 25ml of ethanol and 5ml of isopropanol, seal it and put it in an oven, react at 195°C for 18h, and the reaction is over Finally, take out the substrate and wash it several ti...
Embodiment 2
[0043] NiS / Ni composite nanoparticles were prepared according to the steps in Example 1, and the reaction time in Step 5 was adjusted to 60s, 90s, 120s, and 150s, and other steps remained unchanged.
[0044] The X-ray diffraction XRD characterization figure of the mulberry-shaped NiS / Ni composite nanoparticles obtained in the present embodiment is as follows figure 2 Shown, the hydrogen evolution and oxygen evolution reaction electrochemical performance characterization diagram in 1M KOH solution is as follows image 3 As shown, the stability test curve of the continuous electrolysis of the mulberry-like NiS / Ni composite nanoparticle electrode in 1M KOH solution obtained by loading reaction for 90s is as follows: Figure 4 shown.
Embodiment 3
[0046] NiS / Ni composite nanoparticles were prepared according to the steps in Example 1, the amount of sulfur powder reacted was adjusted to 2 mg, and other steps were kept unchanged.
[0047] The more the amount of sulfur source, the higher the yield of sulfide; if it is too high, the Ni nanoparticles will even completely sulfide into nickel sulfide particles.
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