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Porous nickel composite electrode, electroplating solution and preparation method of porous nickel composite electrode

A composite electrode and porous nickel technology, applied in the direction of electrodes, electrode shapes/types, electrolytic coatings, etc., can solve the problems of electrode power failure resistance, poor short circuit capability, easy oxidation and corrosion of electrodes, and poor electrode stability , to achieve the effects of excellent binding force, excellent hydrogen evolution electrocatalytic performance, and excellent stability

Inactive Publication Date: 2013-01-30
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the electrolysis process, due to gap electrolysis or power failure (discontinuous electrolysis), especially if the electrolysis is stopped for more than two weeks, the electrocatalytic activity of nickel and its alloy electrodes will quickly decay due to air oxidation and corrosion, and the electrode stability not good
In short, the existing electrodes have poor resistance to power failure and short circuit, and the electrodes are easily oxidized and corroded in the non-electrolyzed state

Method used

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  • Porous nickel composite electrode, electroplating solution and preparation method of porous nickel composite electrode
  • Porous nickel composite electrode, electroplating solution and preparation method of porous nickel composite electrode
  • Porous nickel composite electrode, electroplating solution and preparation method of porous nickel composite electrode

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preparation example Construction

[0029] A kind of described porous nickel composite electrode is porous composite Ni / LaNi 5 The preparation method of electrode, comprises the following steps:

[0030] (1) Solid particle pretreatment: Aluminum powder with an average particle size of 10 μm and LaNi with an average particle size of 20 μm 5 The particles are degreased and filtered in a weak base with a pH value of 8.0, and then rinsed with a large amount of distilled water, and then treated with a surfactant, filtered, rinsed with distilled water, and dried; the weak base is ammonia water; the surfactant 1g / L polyethylene glycol.

[0031] (2) Prepare the electroplating solution according to the following formula: NiSO 4 ·6H 2 O 300g·L -1 、NiCl 2 ·6H 2 O 50g·L -1 、H 3 BO 3 40g·L -1 , aluminum powder 30g·L -1 、LaNi 5 Granules 25g·L -1 , the pH of the plating solution is 4.0 to 5.0, prepared with distilled water;

[0032](3) Electroplating: Use a 1.7cm×1.7cm×0.3cm brass sheet coated with a 10μm nickel...

Embodiment 1

[0036] The preparation method of described porous nickel composite electrode, comprises the following steps:

[0037] (1) Solid particle pretreatment: Aluminum powder with an average particle size of 10 μm and LaNi with an average particle size of 20 μm 5 The particles were degreased in ammonia water with a pH value of 8.0, filtered, washed with a large amount of distilled water, treated with 1g / L polyethylene glycol, filtered, rinsed with distilled water, and dried.

[0038] (2) Prepare the electroplating solution according to the following formula: NiSO 4 ·6H 2 O 300g·L -1 、NiCl 2 ·6H 2 O 50g·L -1 、H 3 BO 3 40g·L -1 , aluminum powder 30g·L -1 、LaNi 5 Granules 25g·L -1 , the pH of the plating solution is 4.0, prepared with distilled water;

[0039] (3) Electroplating: Use a 1.7cm×1.7cm×0.3cm brass sheet coated with a 10μm nickel coating as the cathode, and a 6cm×9cm×0.5cm pure nickel plate as the anode, and place the cathode and the anode in parallel in the plati...

Embodiment 2

[0042] This part differs from Embodiment 1 in that:

[0043] (2) Prepare the electroplating solution by the following formula: the pH of the plating solution is 5.0;

[0044] (3) Electroplating: current density 70mA cm -2 .

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Abstract

The invention relates to a porous nickel composite electrode, which comprises a substrate nickel plate, and LaNi5 particles adhered to the substrate nickel plate. An electroplating solution for preparing the porous nickel composite electrode comprises the following components: NiSO4 . 6H2O: 300 g . L<-1>, NiCl2 . 6H2O: 50g . L<-1>, H3BO3: 40g . L<-1>, aluminum powder: 30g . L<-1> and LaNi5 particles: 25g . L<-1>, and the pH is 4.0 to 5.0. A hydrogen storage alloy LaNi5 and Al particle capsules are embedded into a plating layer on a substrate Ni by one-step composite electrodeposition to obtain an Ni / (LaNi5 + Al) precursor, and then aluminum in the plating layer is dissolved by an alkali dissolving method. The porous nickel composite electrode prepared by the invention has the advantages of larger specific surface area, lower hydrogen evolution overpotential, excellent hydrogen evolution electrocatalytic properties, and excellent outage resistance and corrosion resistance, i.e., excellent stability property.

Description

【Technical field】 [0001] The invention relates to a porous nickel composite electrode, an electroplating solution for preparing the porous nickel composite electrode, and a preparation method of the porous nickel composite electrode. 【Background technique】 [0002] Water electrolysis is one of the important technologies for producing high-purity hydrogen. As long as a certain amount of electric energy is provided, water can be decomposed. The efficiency of providing electric energy to split water to produce hydrogen is generally 75% to 85%. The process is simple and pollution-free, but the power consumption is large, which limits its application to a certain extent. In order to reduce the cost of hydrogen production, it is necessary to find more effective hydrogen evolution electrode materials to reduce the hydrogen evolution overpotential and reduce the unit power consumption. Because of its special unpaired d electron layer structure, nickel has moderate hydrogen adsorpti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B11/06C25D15/00
Inventor 王森林段钱花
Owner HUAQIAO UNIVERSITY
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