Sulfur-doped nickel phosphide catalyst for hydrogen evolution reaction and preparation method thereof
A nickel phosphide and catalyst technology, which is applied in the field of electrolysis of water, can solve the problems of reduced catalytic active sites, catalyst shedding, and reduced catalytic activity, and achieve the effects of fast charge and mass transfer, increased electrical conductivity, and inhibited oxidation
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[0035] The invention provides a method for preparing a nickel phosphide catalyst for hydrogen precipitation, including:
[0036] A) Mixing nickel source, ammonium source, urea and water, ultrasonic, stirring and dispersing to obtain the first composite carrier;
[0037] B) reacting the first composite carrier on the support to obtain the second composite carrier;
[0038] C) reacting the second composite carrier with a phosphorus source and a sulfur source to obtain a sulfur-doped nickel phosphide catalyst.
[0039] As the cathode half reaction of electrolyzed water, the hydrogen precipitation reaction requires an effective catalyst to make the electrolyzed water reaction generate a larger current density at a lower overpotential. Noble metals such as platinum catalysts are currently the most effective hydrogen precipitation catalysts. The technical solution provided by the present invention is a sulfur-doped nickel phosphide catalyst for hydrogen precipitation reaction which is a goo...
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[0082] Example 1
[0083] (1) Add 25mmol nickel acetate tetrahydrate, 10mmol ammonium fluoride and 10mmol urea into a beaker containing 35mL of secondary water, sonicate for 30min and stir for 60min, then pour into the autoclave, add a piece of 1cm*1cm carbon paper, Tighten the reactor and react at 120°C for 5 hours to obtain a green intermediate product grown on carbon paper. Then the green intermediate product supported by the carbon paper, 20mmol of hydrated sodium hypophosphite and 3mmol of sulfur powder were added to the corundum boat and placed in a tube furnace, and the temperature was increased to a temperature of 2℃ / min in a nitrogen atmosphere. Calcined at 500℃ and kept for 60min, the nitrogen flow rate is 80cc min -1 , The black product prepared by washing with 5% hydrochloric acid, ethanol and secondary water respectively three times can obtain the target product, that is, the S-doped Ni grown on carbon paper 5 P 4 Nanosheet array, label it as 6% S-Ni 5 P 4 NPA / CP (wh...
Example Embodiment
[0099] Example 2
[0100] (1) Add 25mmol nickel acetate tetrahydrate, 10mmol ammonium fluoride and 10mmol urea into a beaker containing 35mL of secondary water, sonicate for 30min and stir for 60min, then pour into the autoclave, add a piece of 1cm*1cm carbon paper, Tighten the reaction kettle and react at 120°C for 5 hours to obtain a green intermediate product grown on carbon paper. Then the green intermediate product supported by the carbon paper was added to the corundum boat together with 20mmol of hydrated sodium hypophosphite and 1mmol of sulfur powder and placed in a tube furnace. The temperature was increased to a temperature of 2℃ / min in a nitrogen atmosphere. Calcined at 500℃ and kept for 60min, the nitrogen flow rate is 80cc min -1 , The black product obtained by washing with 5% hydrochloric acid, ethanol and secondary water respectively three times can obtain the target product, that is, S-doped Ni grown on carbon paper 5 P 4 Nanosheet array, label it as 2% S-Ni 5 P ...
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