High-efficiency cobalt-nickel oxide/nickel hydroxide composite electrocatalyst and its preparation method and application
A technology of cobalt-nickel oxide and nickel hydroxide, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of easy collapse of catalyst structure, complicated operation steps, Long reaction cycle and other issues, to achieve the effect of effective active reaction area, accelerated ion diffusion and electron conduction rate, and uniform morphology
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[0031] In the above preparation method, in order to allow the raw materials to fully react, preferably, before the solvothermal reaction, the preparation method further includes: magnetically stirring cobalt nitrate, nickel nitrate, sulfur source, and solvent to obtain a transparent solution .
[0032] In the above preparation method, in order to further improve the purity of the prepared product, preferably, after the solvothermal reaction, the preparation method further includes: cooling the reaction system to 15-25°C, and then cleaning and vacuum drying the product; More preferably, the vacuum drying meets the following conditions: the drying temperature is 40-70° C., and the drying time is 4-24 hours; further preferably, deionized water and ethanol are used for cleaning by centrifugation for 3-5 times respectively.
[0033] The present invention also provides a high-efficiency cobalt-nickel oxide / nickel hydroxide composite electrocatalyst, which is prepared by the above-me...
Embodiment 1
[0037] 1) Weigh 2 mmol of cobalt nitrate in a clean beaker, control the molar ratio of cobalt nitrate, nickel nitrate and sulfur source (thioacetamide) to 1:3:0.1, add nickel nitrate and sulfur source, and then add 20 mL of distilled water, Stir on a magnetic stirrer to dissolve completely.
[0038] 2) After the stirring, the obtained transparent solution was transferred into a stainless steel autoclave with a capacity of 25 mL polytetrafluoroethylene liner, and reacted at 140° C. for 10 h. After the reaction, the reaction kettle was taken out, naturally cooled to 25°C, the precipitated product in the kettle was taken out, centrifuged, washed with ethanol and distilled water for 3 times, and finally placed in a vacuum oven at 70°C for 8 hours to obtain The product is a cobalt nickel oxide / nickel hydroxide composite.
Embodiment 2
[0040] 1) Weigh 2 mmol of cobalt nitrate in a clean beaker, control the molar ratio of cobalt nitrate, nickel nitrate and sulfur source (thiourea) to 1:2:0.05, add nickel nitrate and sulfur source, then add 20 mL of distilled water and ethanol (1 : 0.3) of the mixed solution was stirred in a magnetic stirrer to completely dissolve it.
[0041] 2) After the stirring is completed, transfer the obtained transparent solution into a stainless steel autoclave with a capacity of 25 mL polytetrafluoroethylene liner and react at 150° C. for 6 h. After the reaction, the reaction kettle was taken out, naturally cooled to 25°C, the precipitated product in the kettle was taken out, centrifuged, washed with ethanol and distilled water for 3 times, and finally placed in a vacuum oven at 60°C for 10 hours to obtain The product is a cobalt nickel oxide / nickel hydroxide composite.
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