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Nickel molybdenum active cathode with nanostructure for chlor-alkali industry and preparation method thereof

A nanostructure and active cathode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of cathode activity decline, loss, cathode working environment and other problems, and achieve the effect of saving time, convenient operation and excellent catalytic activity

Inactive Publication Date: 2013-01-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electrolysis process of the chlor-alkali industry, the working environment of the cathode is harsh, high temperature, concentrated alkali, a large amount of hydrogen scoured, and the reverse current impact when the power is turned off, etc., can easily lead to the decline or even loss of cathode activity.

Method used

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  • Nickel molybdenum active cathode with nanostructure for chlor-alkali industry and preparation method thereof
  • Nickel molybdenum active cathode with nanostructure for chlor-alkali industry and preparation method thereof
  • Nickel molybdenum active cathode with nanostructure for chlor-alkali industry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] After degreasing, etching, and activation, the copper sheet is used as the substrate, and Ni-Mo alloy is electroplated on its surface. The bath composition is NiSO 4 ·6H 2 O: 30g·L -1 ; (NH 4 ) 6 Mo 7 o 24 ·7H 2 O: 10g·L -1 ;C 6 h 5 Na3 o 7 2H 2 O: 80g·L -1 ;NaCl: 20g·L -1 ; 1-4 butynediol: 0.6g L -1 ; NH 3 ·H 2 O: 25mL·L -1 ;The pH value of the plating solution is 8, the temperature of the plating solution is 45°C, and the cathode current density is 12A / dm 2 , electroplating for 60min. The anode is ruthenium titanium mesh (RuO 2 / TiO 2 ), and the area ratio of anode to cathode is 2:1.

[0040] Use the VEGATS-5130SB scanning electron microscope (SEM) produced by TESCAN to observe the surface morphology of the electrode after electroplating Ni-Mo alloy. The SEM photos are attached figure 2 shown. The surface of the electrode is uneven, and the real surface area of ​​the electrode increases.

[0041] Use the X’Pert Pro X-ray diffractometer (XRD) p...

Embodiment 2

[0044] With the iron mesh cathode used in the chlor-alkali industry as the substrate, firstly, the substrate is electrochemically removed in the degreasing tank to remove the oil stains adhering to the surface. The composition of the degreasing liquid is: sodium hydroxide (NaOH), 15 g / L (g / L ); sodium carbonate (Na 2 CO 3 ), 25 grams / liter (g / L); sodium phosphate (Na 3 PO 4 12H 2 O), 25 grams per liter (g / L). The temperature is 70°C, the current density is 3 amperes / square decimeter (A / dm 2 ), the anode degreasing time is 5 minutes (min). After degreasing, the substrate is rinsed in hot water at 80°C, and then rinsed with cold water to carefully remove residual lye.

[0045] Then place the substrate in 1:1 hydrochloric acid aqueous solution for derusting, at room temperature, until all the rust and oxide layer on the surface are removed. Remove the substrate and rinse with cold water to carefully remove residual acid.

[0046] The substrate after the pretreatment can e...

Embodiment 3

[0051] With the copper sheet as the substrate, Ni-Mo alloy is electroplated on the surface after degreasing, etching and activation. The bath composition is NiSO 4 ·6H 2 O: 50g·L -1 ; (NH 4 ) 6 Mo 7 o 24 ·7H 2 O: 50g·L -1 ;C 6 h 5 Na 3 o 7 2H 2 O: 100g·L -1 ;NaCl: 30g·L -1 ; 1-4 butynediol: 0.8g L -1 ; NH 3 ·H 2 O: 30mL·L -1 ; The pH value of the plating solution is 10, the temperature of the plating solution is 50°C, and the cathode current density is 10A / dm 2 , electroplating for 120min. The anode is ruthenium titanium mesh (RuO 2 / TiO 2 ), and the area ratio of anode to cathode is 2:1.

[0052] Use the X’Pert Pro X-ray diffractometer (XRD) produced by PANALYTICAL to test the structure of the Ni-Mo alloy. See the attached XRD spectrum image 3 . The average grain size of the Ni-Mo alloy can be calculated from the half maximum width of the diffraction peak to be 2nm.

[0053] The surface of the Ni-Mo alloy coating is smooth without obvious cracks, and...

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Abstract

The invention relates to a nickel molybdenum active cathode with nanostructure for chlor-alkali industry and a preparation method thereof. The active cathode comprises a conducting base and a nanostructured alloy coating; the coating is made of Ni-Mo alloy, and has average grain size of 2-50nm and thickness of 20-120 mum. The preparation method is as follows: first removing oil and rust on the base; then placing the base into a plating bath; and plating the Ni-Mo alloy, wherein an electroplating anode is ruthenium titanium mesh, and an area ratio of the anode to the cathode is 2:1. The active cathode with nanostructure can be easily obtained by a conventional plating process, so as to facilitate convenient operation and realization of industrialization. An electrolysis experiment in the chlor-alkali industry is simulated; and when the current density is at 4KA.dm<-2>, cathode potential is 250 mV lower than a current industrial nickel cathode. Through repeated power-off, the active cathode does not corrode, and cell voltage fluctuates within 20 mV, so as to gain good electrochemical stability.

Description

technical field [0001] The invention relates to a nanostructure nickel-molybdenum active cathode for chlor-alkali industry and a preparation method thereof. The electrode has a low hydrogen evolution overpotential, is easy to process, and is stable and durable. Background technique [0002] The chlor-alkali industry is the country's basic raw material industry, and its products such as caustic soda, chlorine gas, hydrogen gas and downstream products are widely used in various departments such as light industry, chemical industry, national defense, and metallurgy. However, chlor-alkali enterprises are large energy consumers and are called "electric tigers". The energy consumption of electrolysis depends on the cell voltage during the production process. With the promotion of dimensionally stable anodes (DSA) since the 1970s, energy-saving metal anodes have been widely used. Therefore, the measure to further reduce the cell voltage is mainly to reduce the cathode overpotentia...

Claims

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Application Information

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IPC IPC(8): C25B11/04C25B1/34C25D3/56
Inventor 张卫国王宏智姚素薇吴强
Owner TIANJIN UNIV
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