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Alkaline water electrolysis Ni-based three-dimensional network gradient alloy hydrogen evolution cathode

A hydrogen evolution cathode and three-dimensional mesh technology, applied in the direction of electrodes, electrolysis components, electrolysis process, etc., can solve the problem of hydrogen evolution activity decline, achieve the effect of increasing the roughness, increasing the catalyst coating area, and improving the working life

Inactive Publication Date: 2012-10-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the hydrogen evolution activity of the Ni-S cathode gradually decreases due to the dissolution of component S after long-term use.

Method used

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  • Alkaline water electrolysis Ni-based three-dimensional network gradient alloy hydrogen evolution cathode
  • Alkaline water electrolysis Ni-based three-dimensional network gradient alloy hydrogen evolution cathode
  • Alkaline water electrolysis Ni-based three-dimensional network gradient alloy hydrogen evolution cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] After the Ni mesh electrode (2cm*2cm*0.2cm) is degreased by alkali, the Ni-Mo alloy coating is deposited gradiently. The bath composition is NiSO 4 ?6H 2 O 200g / L, NiCl 2 ?6H 2 O 40g / L, Na 3 C 6 h 5 o 7 ?2H 2 O 90g / L, Na 2 MoO 4 10g / L. The volume of the plating solution is 200ml. After 2 minutes of deposition, gradually add 100g / l Na to the plating solution 2 MoO 4 solution, the dropping rate is 2.5ml / min. After 20min, the contents of Ni and Mo in different alloy layers after deposition are as follows: image 3 As shown, the deposition current density is 20mA / cm 2 , the counter electrode is a Ni sheet electrode, and the electrodeposition temperature is 65°C. After deposition, place in 2mol / L-NH 3 -1mol / L NH 4 Constant current 10mA / cm in Cl etching bath 2 The anode was etched for 5 minutes, and the etching temperature was 25°C. The surface of the catalyst after etching was as follows: Figure 4 As shown, the surface of the electrode is rough, the sp...

Embodiment 2

[0035] After the Ni mesh electrode (2cm*2cm*0.2cm) is degreased by alkali, the Ni-Mo alloy coating is deposited gradiently. The bath composition is NiSO 4 150g / L, NiCl 2 80g / L, Na 3 C 6 h 5 o 7 120g / L. The volume of the plating solution is 200ml. After deposition for 1min, gradually add 10g / l Na to the plating solution 2 MoO 4 Solution, the dropping rate is 4ml / min. The dropping time is 15min, and the deposition current density is 15mA / cm 2 , the counter electrode is a Ni sheet electrode, and the electrodeposition temperature is 70°C. After deposition, place in 4mol / L NH 3 -2mol / L NH 4 The anode was etched in a Cl electrochemical etching tank for 3 min at a temperature of 75 °C, and then washed and dried to form a Ni-Mo mesh alloy active cathode.

[0036] Shanghai Chenhua CHI660C electrochemical test station was used to test the polarization overpotential of the electrode, the scanning speed was 2mV / s, the electrolyte solution was 6mol / L NaOH, 70°C, and t...

Embodiment 3

[0038] After the Ni mesh electrode (2cm*2cm*0.2cm) is degreased by alkali, the Ni-Mo alloy coating is deposited gradiently. The bath composition is NiSO 4 150g / L, NiCl 2 80g / L, Na 3 C 6 h 5 o 7 120g / L, lead acetate (CH 3 COO) 2 Pb 0.03g / L. The volume of the plating solution is 200ml. After 2 minutes of deposition, gradually add 100g / L Na to the plating solution 2 MoO 4 Solution, the dropping rate is 3ml / min. The dropping time is 15min, and the deposition current density is 25mA / cm 2 , the counter electrode is a Ni sheet electrode, and the electrodeposition temperature is 70°C. After deposition, place in 2mol / L NH 3 -1mol / L NH 4 Constant current 20mA / cm in Cl etching bath 2 The anode was etched for 1 min, the etching temperature was 25°C, and then washed and dried to form a Ni-Mo mesh alloy active cathode.

[0039] Shanghai Chenhua CHI660C electrochemical test station was used to test the polarization overpotential of the electrode, the scanning speed ...

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Abstract

The invention provides a cathode for hydrogen production by alkaline water electrolysis or a cathode for chlor-alkali industry and a preparation method thereof. The method is characterized by using a three-dimensional nickel net as a matrix, conducting electrochemical deposition by controlling electrodeposition potential and the concentration of Ni and Mo in the electrolyte to form a Ni-Mo alloy coating to gradually reduce the concentration of Ni near the side of the matrix in the coating and gradually increase the concentration of Mo near the side of the matrix in the coating; and then, conducting anodic etching in an ammonia solution, wherein because the dissolution and solution of Ni are generated in the coating and the matrix and Mo is kept, the electrode specific surface is increased, and hydrogen evolution over potential is reduced. According to the gradient deposition and anodic etching method of the invention, the catalyst coating and Ni matrix form integrated alloy, delamination and detachment between the catalyst and the matrix can be prevented, and simultaneously good hydrogen evolution performance is achieved.

Description

technical field [0001] The invention provides a three-dimensional mesh nickel-based alloy hydrogen evolution cathode and a manufacturing method thereof, especially the composition of the nickel-based alloy is continuously changing and has a high specific surface area, and the electrode can be used in alkaline water electrolysis hydrogen production and electrolytic cells in the chlor-alkali industry As a cathode, it has the characteristics of low cell pressure and long service life. Background technique [0002] The alkaline water electrolysis hydrogen production industry and the chlor-alkali industry are large power consumers. With the continuous rise of energy prices, the production costs of electrolysis enterprises and the chlor-alkali industry are getting higher and higher, and the economic benefits are also seriously affected. Electrolysis is the key technology for the chlor-alkali industry and industrial water electrolysis to produce hydrogen. Most of the cathodes used ...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B11/03C25B1/04C25B1/34C25D5/00C25D3/56
CPCY02E60/366Y02E60/36
Inventor 万平玉余章龙陈咏梅
Owner BEIJING UNIV OF CHEM TECH
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