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

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...

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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 catalysts generally require binders such as Nafion or PTFE as binders when they are combined with current collectors. These binders will block the catalytic active sites of the catalyst. At the same time, the combination of the catalyst and the current collector is not particularly strong. The catalyst It is easy to fall off from the current collector, resulting in the reduction of catalytic active sites and the decrease of catalytic activity

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