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Hydrogen evolution catalyst with nickel hydroxide layer coated elemental ruthenium structure and preparation method thereof

A technology of nickel hydroxide layer and nickel hydroxide, which is applied in the field of electrocatalysis, can solve the problem that the performance and stability of transition metal catalysts cannot be compared with platinum, and achieve good electrical conductivity and mechanical stability, safety and cost, and simple synthesis method Effect

Active Publication Date: 2021-02-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Transition metal catalyst performance and stability are still not comparable to platinum

Method used

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  • Hydrogen evolution catalyst with nickel hydroxide layer coated elemental ruthenium structure and preparation method thereof
  • Hydrogen evolution catalyst with nickel hydroxide layer coated elemental ruthenium structure and preparation method thereof
  • Hydrogen evolution catalyst with nickel hydroxide layer coated elemental ruthenium structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1, weigh a certain mass of ruthenium chloride hydrate, add it into 30 ml of 1M sodium hydroxide solution, and stir magnetically until uniform. The preparation concentration is 2.97×10 -4 mol / L ruthenium chloride solution.

[0031] In step 2, 0.2480 g of nickel foam sheet was weighed and washed with 3M hydrochloric acid, absolute ethanol and deionized water in sequence.

[0032] In step 3, the nickel foam is put into the uniformly stirred solution in step 1, placed in a homogeneous reactor, and reacted at 160° C. for 24 hours to obtain a catalyst with a nickel hydroxide layer coated with elemental ruthenium structure.

[0033] figure 1 It is a scanning electron microscope image of the catalyst with a nickel hydroxide layer coated with elemental ruthenium structure prepared by the one-step method in Example 1 of the present invention. It can be seen from the figure that the surface of the nickel foam is uniformly covered with a large number of wrinkled nanosheet s...

Embodiment 2

[0036] Step 1, weigh a certain mass of ruthenium chloride hydrate, add it into 30 ml of 1M sodium hydroxide solution, and stir magnetically until uniform. The preparation concentration is 5.95×10 -4 mol / L ruthenium chloride solution.

[0037]In step 2, 0.2480 g of nickel foam sheet was weighed and washed with 3M hydrochloric acid, absolute ethanol and deionized water in sequence.

[0038] In step 3, the nickel foam is put into the uniformly stirred solution in step 1, placed in a homogeneous reactor, and reacted at 160° C. for 24 hours to obtain a catalyst with a nickel hydroxide layer coated with elemental ruthenium structure.

[0039] Figure 7 The polarization curve diagram of the catalyst with the nickel hydroxide layer-coated elemental ruthenium structure prepared by the one-step method in Example 2 of the present invention. It can be seen from the figure that the catalyst prepared by this method can reach a current density of 10 mA cm -2 , the required overpotential ...

Embodiment 3

[0041] Step 1, weigh a certain mass of ruthenium chloride hydrate, add it into 30 ml of 1M sodium hydroxide solution, and stir magnetically until uniform. The preparation concentration is 2.97×10 -4 mol / L ruthenium chloride solution.

[0042] In step 2, 0.2480 g of nickel foam sheet was weighed and washed with 3M hydrochloric acid, absolute ethanol and deionized water in sequence.

[0043] In step 3, the foamed nickel is put into the uniformly stirred solution in step 1, placed in a homogeneous reactor, and reacted at 160° C. for 12 hours to obtain a catalyst with a nickel hydroxide layer coated with elemental ruthenium structure.

[0044] Figure 8 The polarization curve diagram of the catalyst with the nickel hydroxide layer-coated elemental ruthenium structure prepared by the one-step method in Example 3 of the present invention. It can be seen from the figure that the catalyst prepared by this method can reach a current density of 10 mA cm -2 , the required overpotenti...

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Abstract

The invention discloses a hydrogen evolution catalyst with a nickel hydroxide layer coated elemental ruthenium structure and a preparation method thereof. The catalyst comprises nickel hydroxide and ruthenium, elemental ruthenium is anchored on the surface of foamed nickel and is coated with a nickel hydroxide layer, and ruthenium chloride hydrate and foamed nickel are added into a sodium hydroxide solution to directly synthesize the required catalyst in a homogeneous reactor in a one-step hydrothermal mode. The nickel hydroxide nano sheet and the elemental ruthenium grow on the surface of thefoamed nickel in-situ, so that the use of an additional adhesive is avoided, the good conductivity and mechanical stability are ensured, and the catalytic performance of the catalyst in an alkaline environment is improved by utilizing the synergistic effect between the bi-functional active sites of nickel hydroxide and ruthenium; when the current density of the prepared catalyst in a 1.0 M KOH electrolyte solution is 10 mA.cm<-2>, the required over potential is 27.56 mV (vs RHE).

Description

technical field [0001] The invention relates to the field of electrocatalysis, in particular to a nickel hydroxide layer-coated elemental ruthenium structure hydrogen evolution catalyst and a preparation method thereof. Background technique [0002] With the acceleration of the industrialization process, the consumption of non-renewable energy by human beings is increasing day by day, the problem of environmental pollution is becoming more and more prominent, and the development of sustainable energy has received more and more attention. Due to its advantages of 1) high energy density, 2) abundant reserves and wide sources, and 3) absolute cleanliness and no pollution, hydrogen has attracted more and more attention and attention. The electrolysis of water for hydrogen evolution is an attractive method. The development and utilization of highly active and low-cost hydrogen evolution catalysts are the key factors to improve the efficiency of water electrolysis and reduce its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C25B11/093C25B1/04
CPCB01J23/892C25B11/04C25B1/04B01J35/33Y02E60/36
Inventor 曲虹霞陈世卓张怡崔健孙聪
Owner NANJING UNIV OF SCI & TECH
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