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Three-dimensional nanoflower-like Ni-Fe composite hydroxide oxygen evolution anode used for carbonate electrolysis

A technology of compound hydroxide and oxygen evolution, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problems of high price and unsuitable for large-scale industrial electrolysis, and achieve the effect of reducing the energy consumption of electrolysis

Active Publication Date: 2017-11-24
内蒙古瑞达泰丰化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] At present, among the commonly used anode oxygen evolution catalysts in alkaline solution, noble metal oxides RuO 2 , IrO 2 and RhO 2 Although such catalysts have good catalytic activity, they are expensive and not suitable for large-scale industrial electrolysis

Method used

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  • Three-dimensional nanoflower-like Ni-Fe composite hydroxide oxygen evolution anode used for carbonate electrolysis
  • Three-dimensional nanoflower-like Ni-Fe composite hydroxide oxygen evolution anode used for carbonate electrolysis
  • Three-dimensional nanoflower-like Ni-Fe composite hydroxide oxygen evolution anode used for carbonate electrolysis

Examples

Experimental program
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Effect test

Embodiment 1

[0026] (1) Mix 8 mmol L -1 NiSO 4 •6H 2 O and 8 mmol L -1 FeSO 4•7H 2 Mixed solution of O as electrodeposited NiFe(OH) x / Ni foam Precursor salt for oxygen evolution anode, 25 mmol L -1 of (NH 4 ) 2 SO 4 As a buffer solution, the solution prepared above was mixed with 1 mol L -1 h 2 SO 4 After adjusting to pH = 4, the electrodeposition solution was prepared for use.

[0027] (2) At room temperature, NiFe(OH) was prepared by electrodeposition experiment using a two-electrode system x / Ni foam Oxygen evolution anode. The blank nickel foam (10 mm × 10 mm) after degreasing the oxide film was used as the cathode, and the Pt sheet (10 mm × 10 mm) electrode was used as the auxiliary electrode. Apply 10 mA cm to the cathode -2 The current density of NiFe(OH) was made after electrodeposition for 60 s x / Ni foam electrode.

[0028] The SEM of the obtained Ni-Fe composite hydroxide is as follows figure 1 As shown in the figure, it can be seen from the figure that ...

Embodiment 2

[0031] (1) Mix 10 mmol L -1 NiSO 4 •6H 2 O and 10 mmol L -1 FeSO 4 •7H 2 Mixed solution of O as electrodeposited NiFe(OH) x / Ni foam Oxygen evolution anode precursor salt, 30 mmol L -1 of (NH 4 ) 2 SO 4 As a buffer solution, the solution prepared above was mixed with 1.5 mol L -1 h 2 SO 4 After adjusting to pH = 4, the electrodeposition solution was prepared for use.

[0032] (2) At room temperature, NiFe(OH) was prepared by electrodeposition experiment using a two-electrode system x / Ni foam Oxygen evolution anode. The blank nickel foam (10 mm × 10 mm) after degreasing the oxide film was used as the cathode, and the Pt sheet (10 mm × 10 mm) electrode was used as the auxiliary electrode. Apply 60 mA cm to the cathode -2 The current density of NiFe(OH) was made after electrodeposition for 120 s x / Ni foam electrode.

[0033] The SEM of the obtained Ni-Fe composite hydroxide is as follows image 3 As shown, it can be seen from the figure that the prepared...

Embodiment 3

[0036] (1) Mix 8 mmol L -1 NiCl 2 ▪6H 2 O, 8 mmol L -1 FeCl 2 ▪4H 2 Mixed solution of O as electrodeposited NiFe(OH) x / Ni foam Oxygen evolution anode precursor salt, 50 mmol L -1 of (NH 4 ) 2 SO 4 As a buffer solution, the solution prepared above was mixed with 1 mol L -1 HCl was adjusted to pH = 4 to make an electrodeposition solution for later use.

[0037] (2) At room temperature, NiFe(OH) was prepared by electrodeposition experiment using a two-electrode system x / Ni foam Oxygen evolution anode. The blank nickel foam (10 mm × 10 mm) after degreasing the oxide film was used as the cathode, and the Pt sheet (10 mm × 10 mm) electrode was used as the auxiliary electrode. Apply 200 mA cm to the cathode -2 The current density of NiFe(OH) made after electrodeposition for 60 s x / Ni foam electrode.

[0038] The SEM of the obtained Ni-Fe composite hydroxide is as follows Figure 4 As shown, it can be seen from the figure that the prepared composite hydroxide ...

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Abstract

The invention discloses a Ni-Fe composite hydroxide oxygen evolution anode material used for a sodium carbonate system and a preparation method of the Ni-Fe composite hydroxide oxygen evolution anode material. The oxygen evolution anode material is of a three-dimensional nanoflower-like structure assembled by ultrathin nanosheets. Because of the special three-dimensional structure, not only are oxygen evolution catalytic activity sites of an electrode surface increased, but also escape of precipitated oxygen is facilitated. The oxygen evolution anode material is applied to sodium carbonate electrolysis, oxygen evolution potentials are reduced, energy consumption is greatly reduced, and economic value and practical value are great. Meanwhile, a method of cathodic reductionelectro-deposition is adopted in a sulfate or chlorate system, hydrogen generated from cathodic reduction serves as a template to facilitate oriented growth of deposited composite hydroxides, and the three-dimensional nanoflower-like structure is obtained. The preparation method is simple, feasible, mild in condition and suitable for industrialized application.

Description

technical field [0001] The invention relates to an oxygen evolution anode, in particular to a Ni-Fe composite hydroxide oxygen evolution anode suitable for a carbonate electrolysis system. Background technique [0002] RHCO is produced at the anode during the electrolysis of carbonate 3 (R + can be Na + or K + ) and oxygen, the cathode produces ROH and hydrogen, and the main reaction formula is as follows: [0003] Anode: 2R 2 CO 3 + H 2 O - 2e - → 2RHCO 3 + 2R + + 1 / 2O 2 (1) [0004] Cathode: 2H 2 O + 2R + + 2e - → 2ROH + H 2 (2) [0005] Total reaction formula: 2R 2 CO 3 + 3H 2 O → 2RHCO 3 + 2ROH + 1 / 2O 2 + H 2 (3) [0006] where RHCO 3 Aluminum hydroxide can be prepared from carbon or a high concentration of CO can be precipitated 2 , ROH can be used to dissolve bauxite or capture low-concentration CO 2 ; In addition, the oxygen and hydrogen produced by electrolysis also have important industrial applications as green energy ga...

Claims

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Application Information

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IPC IPC(8): C25D7/04C25D9/08C25B11/06C25B11/03B82Y40/00
CPCB82Y40/00C25D7/04C25D9/08C25B11/031C25B11/057C25B11/075
Inventor 孙艳芝张林影唐阳
Owner 内蒙古瑞达泰丰化工有限责任公司
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