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High-efficiency porous Ni-Mo hydrogen evolution electrode and preparation method thereof

A hydrogen evolution electrode, high-efficiency technology, applied in the direction of electrode, electrode shape/type, electrolysis process, etc., can solve the problems of high energy consumption in the preparation of hydrogen evolution electrodes, difficulties in industrial production, etc., to increase the real surface area and specific surface area, and improve catalytic hydrogen evolution Activity and stability-enhancing effect

Inactive Publication Date: 2016-12-07
天津市大陆制氢设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a high-efficiency Ni-Mo hydrogen evolution electrode and its preparation method, which overcomes the problems of high energy consumption and difficulty in industrial production of the hydrogen evolution electrode in the prior art

Method used

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  • High-efficiency porous Ni-Mo hydrogen evolution electrode and preparation method thereof
  • High-efficiency porous Ni-Mo hydrogen evolution electrode and preparation method thereof
  • High-efficiency porous Ni-Mo hydrogen evolution electrode and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] (1) Pretreatment of conductive substrate

[0033] The substrate is nickel foam, and the nickel foam is cut to a size of 2.5cm*4.0cm, and rinsed with deionized water for later use. Firstly, electrolytic degreasing was performed on the tailored nickel foam; the nickel foam was used as the cathode and the anode successively, placed in the electrolyte, and electrolyzed for 15 minutes respectively, with a current density of 40mA cm -2 . The electrolyte formula is: sodium hydroxide 40g L -1 , sodium carbonate 25g·L -1 , sodium phosphate 25g·L -1 . After degreasing treatment, the electrode was rinsed repeatedly with deionized water until the pH value was neutral. Afterwards, pickling the foamed nickel after electrolytic degreasing: put it into the acid solution for 30 minutes, then rinse it with deionized water until the pH is neutral, and set it aside. The pickling liquid configuration method is to mix concentrated hydrochloric acid and deionized water according to the ...

Embodiment 2

[0047] Step (1) is the same as step (1) in Example 1;

[0048] (2) Plasma spraying Ni-Mo-Al particles

[0049] Nickel powder with a particle size of 10 μm, Mo particles with a particle size of 60 nm, and Al with a particle size of 200 μm are uniformly mixed in a mass ratio of 5:1:1. The metal particle mixing process is as follows: after mixing nano-Ni particles, Mo particles and Al particles in a ratio of 5:1:1, put them into a ball mill and grind for 3 hours.

[0050] After taking it out, use the method of plasma spraying, under the protection of shielding gas, evenly spray on the surface of foamed nickel.

[0051] (3) The electrode after plasma spraying is treated in a constant temperature water bath of potassium hydroxide solution to remove Al

[0052] The nickel foam finished by plasma spraying was immersed in a KOH solution with a mass fraction of 25%, and treated in a water bath at a constant temperature for 24 hours. The temperature of the water bath was set at 60°C....

Embodiment 3

[0059] (1) The base is nickel mesh, cut to a size of 2.5cm*4.0cm, rinsed with deionized water and set aside. Put the nickel net into the constant temperature water bath to raise the temperature to 100°C, then put the machined nickel net into it, treat it at constant temperature for 1 hour, and then rinse it with deionized water; then pickle the nickel net: put Soak in acid solution for 30 minutes, then rinse with deionized water until the pH is neutral, and set aside.

[0060] (2) Plasma spraying Ni-Mo-Al particles

[0061] Nickel powder with a particle size of 200 μm, Mo particles with a particle size of 5 nm, and Al with a particle size of 10 μm are uniformly mixed in a mass ratio of 9:1:1. The mixing process of metal particles is as follows: after mixing nano-Ni particles, Mo particles and Al particles in a ratio of 9:1:1, put them into a ball mill and grind for 3 hours.

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Abstract

The invention discloses a high-efficiency porous Ni-Mo hydrogen evolution electrode and a preparation method thereof. The preparation method of the high-efficiency porous Ni-Mo hydrogen evolution electrode comprises the steps that firstly, an oxide layer and grease substances on the surface of a nickel net or foamed nickel are removed through mechanical shearing, degreasing (alkali-washing degreasing or electrolytic degreasing), and acid pickling; secondly, Ni particles, Mo particles and Al particles are evenly mixed according to a certain proportion and then sprayed onto a pretreated conductive substrate in a plasma spraying way; thirdly, a sprayed electrode is subjected to alkali washing, so that active Al metal is removed; and finally, the electrode treated with alkali liquor is placed in a tubular furnace for high-temperature thermal reduction. According to the electrode, molybdenum nanoparticles are used as a molybdenum element source to be evenly doped into a catalyst layer, so that a plating structure which is excellent in hydrogen evolution capacity, provided with the uniform catalyst layer and high in hydrogen evolution activity is formed. The active Al metal is removed through alkali washing, so that a porous structure is formed on the surface of the electrode, a reaction active site is enlarged, and the hydrogen evolution activity is improved. According to the preparation method of the high-efficiency porous Ni-Mo hydrogen evolution electrode, operation is simple, the production cost is low, and the catalyst layer is firm in structure. The hydrogen evolution catalytic active electrode prepared through the method can be widely applied to the alkaline water electrolysis industry.

Description

technical field [0001] The invention relates to the field of hydrogen preparation, and specifically relates to a low-energy-consumption Ni-Mo hydrogen evolution electrode and a preparation method thereof. Background technique [0002] Since the 21st century, as air pollution, global warming and other phenomena have continued to intensify, people have paid more and more attention to environmental pollution issues. The rapid consumption of fossil fuels not only causes environmental pollution problems, but also causes a sharp decline in their storage capacity. As the two major problems of environmental pollution and fossil fuel reserves are becoming increasingly prominent, the world is turning its research focus to the development of renewable and clean new energy represented by hydrogen energy. The characteristic of renewable clean new energy is that it is inexhaustible, which can not only meet today's economic development requirements, but also alleviate environmental pressu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/06C23C4/134C23C4/08C25B1/04
CPCC23C4/08C25B1/04C25B11/031C25B11/051C25B11/091Y02E60/36
Inventor 许卫
Owner 天津市大陆制氢设备有限公司
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