Nickel molybdate/graphene composite for electro-catalysis hydrogen evolution and preparation method thereof
A composite material, nickel molybdate technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problem that the hydrogen evolution performance of nickel-based electrodes is not very good, so as to improve the electrocatalytic hydrogen evolution ability and improve the effect of easy agglomeration
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Embodiment 1
[0028] 1) Graphene oxide GO was synthesized by the improved Hummers method, and the synthesis steps included two steps of pre-oxidation and secondary oxidation;
[0029] 2) 2mmol (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2mmol Ni(NO 3 ) 2 After ultrasonically mixing 5ml of graphene solution with a concentration of 1.0mol / l in 15ml of deionized water for 10min, transfer it to a high-pressure reactor lined with tetrafluoroethylene, put it in a constant temperature drying oven, and conduct a hydrothermal reaction at 180°C for 24h;
[0030] 3) Transfer the product after the reaction into a centrifuge tube, centrifuge and wash with deionized water and ethanol for 2-3 times, then put the processed product in a freeze-drying box and freeze-dry at -70°C for 72 hours;
[0031] 4) Transfer the dried sample to a tube furnace for calcination at 500°C for 2 hours to obtain a nickel molybdate / graphene composite material, represented by sample 1; from figure 1 It can be seen that the material is in...
Embodiment 2
[0037] 1) Graphene oxide GO was synthesized by the improved Hummers method, and the synthesis steps included two steps of pre-oxidation and secondary oxidation;
[0038] 2) Add 1mmol (NH 4 ) 6 Mo 7 o 24 4H 2 O, 2mmol Ni(NO 3 ) 2 After ultrasonically mixing 5ml of graphene solution with a concentration of 1.2mol / l in 10ml of deionized water for 10min, transfer it to a high-pressure reactor lined with tetrafluoroethylene, put it in a constant temperature drying oven, and conduct a hydrothermal reaction at 120°C for 12h;
[0039] 3) Transfer the product after the reaction into a centrifuge tube, centrifuge and wash with deionized water and ethanol for 2-3 times, then put the processed product in a freeze-drying box and freeze-dry at -70°C for 72 hours;
[0040] 4) transfer the dried sample to a tube furnace, and calcined at 500°C for 4h to obtain a nickel molybdate / graphene composite material, represented by sample 2; from figure 2It can be seen that the material basicall...
Embodiment 3
[0046] 1) Graphene oxide GO is synthesized by the improved Hummers method, and the synthesis steps include two steps of pre-oxidation and secondary oxidation;
[0047] 2) 4 mmol (NH 4 ) 6 Mo 7 O 24 ·4H 2 O, 2 mmol Ni (NO 3 ) 2 After ultrasonic mixing with 5ml of graphene solution with a concentration of 0.8mol / l in 20ml of deionized water for 10min, it was transferred to an autoclave lined with tetrafluoroethylene, put into a constant temperature drying box, and hydrothermally reacted at 160°C for 18h;
[0048] 3) The product after the reaction is transferred into a centrifuge tube, centrifuged and washed with deionized water and ethanol for 2-3 times, and then the processed product is placed in a freeze-drying box and freeze-dried at -70°C for 72 hours;
[0049] 4) Transfer the dried sample to a tube furnace for calcination at 600 °C for 2 h to obtain a nickel molybdate / graphene composite material; image 3 It can be seen that the material has a band-like structure wit...
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