A kind of molybdenum nitride/cerium oxide composite material and its preparation method and application
A composite material, cerium oxide technology, applied in the field of electrolysis of water for hydrogen evolution, can solve the problems of poor stability, performance gap, restricting wide application, etc., to achieve the effect of enhancing adsorption and dissociation, excellent hydrogen evolution performance, and improving activity and stability.
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[0041] In yet another specific embodiment of the present invention, the preparation method of the hydrogen evolution electrode comprises:
[0042](1) placing foamed nickel in a mixed aqueous solution forming a cerium precursor for hydrothermal reaction to obtain foamed nickel coated with a cerium-containing precursor;
[0043] (2) The nickel foam coated with the precursor containing cerium is placed in the mixed aqueous solution forming the precursor of molybdenum for hydrothermal reaction to obtain the nickel foam coated with the precursor containing molybdenum / precursor containing cerium;
[0044] (3) The nickel foam coated with the molybdenum-containing precursor / cerium-containing precursor is placed in an ammonia atmosphere and calcined at a high temperature.
[0045] In yet another specific embodiment of the present invention, the nickel foam is pretreated first, and the pretreatment includes ultrasonically cleaning the metallic nickel foam substrate with acetone, ethanol...
Embodiment 1
[0054] Firstly, nickel metal foam with a suitable size was ultrasonically cleaned with acetone, ethanol, and deionized water for 20 minutes, and dried with nitrogen. Add 0.6mmol cerous nitrate, 1mmol urea, and 15ml deionized water into a 20ml hydrothermal kettle to form a mixed aqueous solution of cerium precursor; put the dried nickel foam into the above mixed solution, and keep it in an oven at 180°C for 12h. Naturally cooled to room temperature, the nickel foam substrate was taken out, washed several times with deionized water, and dried to obtain nickel foam coated with cerium-containing precursor.
[0055] Add cerium-containing precursor-coated nickel foam, 0.05mmol ammonium molybdate, 1mmol urea, and 15ml deionized water into a 20ml hydrothermal kettle, keep the reaction in an oven at 180°C for 12h, and cool naturally to room temperature. The removed nickel foam substrate was washed with deionized water and dried. A nickel foam coated with a precursor containing molybde...
Embodiment 2
[0059] Firstly, nickel metal foam of appropriate size was ultrasonically cleaned with acetone, ethanol, and deionized water for 30 minutes respectively, and dried with nitrogen. Add 0.8mmol cerous nitrate, 3mmol urea, and 15ml deionized water into a 20ml hydrothermal kettle to form a mixed aqueous solution of the cerium precursor; put the dried nickel foam into the above mixed solution, and keep it in an oven at 180°C for 12 hours. Naturally cooled to room temperature, the nickel foam substrate was taken out, washed several times with deionized water, and dried to obtain nickel foam coated with cerium-containing precursor.
[0060] Add cerium-containing precursor-coated nickel foam, 0.08mmol ammonium molybdate, 2mmol urea, and 15ml deionized water into a 20ml hydrothermal kettle, keep the reaction in an oven at 180°C for 12h, and cool naturally to room temperature. The removed nickel foam substrate was washed with deionized water and dried. A nickel foam coated with a precurs...
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