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

Active Publication Date: 2017-12-22
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

However, it should be pointed out that the surface of transition metal phosphides is easily oxidized, which leads to (electro)chemical stability not being maintained for a long time in long-term and continuous operation (Z.Huang, Z.Chen, Z.Chen, C. Lv, H. Meng, C. Zhang, Ni 12 P 5 Nanoparticles as an Efficient Catalyst for Hydrogen Generation via Electrolysis and Photoelectrolysis, ACSNano, 2014, 8, 8121-8129)
In addition, traditional powder

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  • Sulfur-doped nickel phosphide catalyst for hydrogen evolution reaction and preparation method thereof
  • Sulfur-doped nickel phosphide catalyst for hydrogen evolution reaction and preparation method thereof
  • Sulfur-doped nickel phosphide catalyst for hydrogen evolution reaction and preparation method thereof

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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...

Example Embodiment

[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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Abstract

The invention provides a sulfur-doped nickel phosphide catalyst for hydrogen evolution reaction and a preparation method thereof. The preparation method includes the steps that A, a nickel source, an ammonium source, urea and water are mixed, and ultrasonic and stirring dispersion are conducted to obtain a first compound carrier; B, the first compound carrier is reacted on a supporting body to obtain a second compound carrier; and C, a nickel phosphide catalyst with the hydrogen being precipitated is obtained through reaction of the second compound carrier, a phosphate source and a sulfur source. According to the method, firstly a nickel hydroxide first compound carrier is obtained through reaction of the nickel source, the ammonium source, the urea and the water, and then the first compound carrier grows on the supporting body to obtain the second compound carrier; after that, a sulfur-doped nickel phosphide catalyst is obtained through simultaneous reaction of the second compound carrier, the nickel source and the sulfur source. According to the preparation method, the catalyst grows on a current collector directly, so that the current collector is more tightly connected with the catalyst, an adhesive agent is not needed, the cost is saved, the electrical conductivity is increased, so that the electric charge transfer is rapider, and high catalytic activity and high stability are achieved on the hydrogen evolution reaction.

Description

technical field [0001] The invention relates to the technical field of electrolyzed water, in particular to a sulfur-doped nickel phosphide catalyst for hydrogen evolution reaction and a preparation method thereof. Background technique [0002] Electrolyzed water technology offers an attractive chemical approach for renewable energy storage. As the cathodic half-reaction of water electrolysis, the hydrogen evolution reaction requires efficient catalysts to enable the water electrolysis reaction to generate larger current densities at lower overpotentials. Noble metal catalysts such as platinum are currently the most effective hydrogen evolution catalysts, however, the low crustal abundance and high price of platinum inhibit the large-scale commercialization of water electrolysis technology. Therefore, the development of efficient, cheap, easy-to-prepare, and long-term durability catalysts is the direction of efforts and the biggest challenge for researchers. Most electroly...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/04C25B1/55Y02E60/36
Inventor 邢巍常进法李国强刘长鹏葛君杰李晨阳梁亮张弘
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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