A kind of preparation method and application of graphene-based nickel-cobalt bimetallic oxygen evolution catalyst
An alkenyl nickel-cobalt and bimetallic technology, applied in the field of electrochemical catalysis, can solve the problems of low catalytic current density, high price, complex synthesis method, etc.
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[0024] (1) Preparation of catalyst slurry: Weigh 4 mg of catalyst powder and disperse it into 1 mL of absolute ethanol, then add 20 μL of Nafion solution (5w.t.%) to it, and then disperse it uniformly by ultrasonication for 30 min to obtain a catalyst slurry.
[0025] (2) Electrode preparation: 4 μL of the catalyst slurry prepared above was pipetted onto the glassy carbon electrode with a pipette gun, and air-dried naturally.
[0026] (3) Test of electrode activity: The prepared glassy carbon working electrode was connected into a three-electrode system for testing.
[0027] The testing process is as follows:
[0028] 1) The electrochemical test system is a three-electrode system (the glassy carbon electrode loaded with catalyst is the working electrode, the platinum wire is the counter electrode, and the saturated calomel electrode (SCE) is the reference electrode), and the electrolyte is 1mol / L KOH solution.
[0029] 2) Before the test, feed N into the reactor 2 Saturation...
Embodiment 1
[0033] (1) Weigh 30mg of GO into a beaker, add 30mL of deionized water, and ultrasonically dissolve it completely for 1 hour, and the solution turns orange-yellow. Then weigh 150 mg of thioacetamide, and add it into the above GO dispersion under magnetic stirring. The resulting mixture was transferred to a 50 mL autoclave and reacted at 170° C. for 16 h. The product is centrifuged, washed with deionized water, and centrifuged; nitrogen-sulfur-doped graphene is obtained;
[0034] (2) Take 38 mg of nitrogen-sulfur-doped graphene obtained in step (1), ultrasonically disperse it in 30 mL of deionized water, and then add 190 mg of CoCl under stirring 2 ·6H 2 O, 47.5mg NiCl 2 ·6H 2 O, keep stirring for 2h, then add 494mg thiourea to it, transfer it to the autoclave, fully react at 200°C for 12h, wash the obtained product with anhydrous ethanol and deionized water three times respectively, and finally use a freeze dryer temperature -50℃, lyophilized to get CoS 2 / NiCo 2 S 4 / ...
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