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Preparation method of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide and application of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide in water electrolysis for hydrogen production

A technology with low crystallinity and hydroxide, which is applied in the direction of electrolysis process, electrolysis components, electrolysis inorganic material coating, etc., can solve the problems of poor stability, high price, and limitation of large-scale application, and achieve mild reaction, low price, The effect of the simple and easy-to-operate preparation method

Active Publication Date: 2021-10-08
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the scarcity, high price and poor stability of noble metals greatly limit their large-scale application

Method used

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  • Preparation method of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide and application of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide in water electrolysis for hydrogen production
  • Preparation method of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide and application of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide in water electrolysis for hydrogen production
  • Preparation method of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide and application of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide in water electrolysis for hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of a low-crystallinity material of zirconium-doped cobalt-iron layered double hydroxide comprises the following steps:

[0027] will contain 2mM Co(NO 3 ) 2 ·6H 2 O(0.582g), 2mM Fe(NO 3 ) 3 9H 2 O (0.808g), 2mM ZrCl 4 (0.466g), 0.3M KNO 3 (3.03 g) was dissolved in 100 mL of deionized water and stirred at a constant speed for 1 hour to form a homogeneous solution; the substrate NF was placed in nitric acid to clean the surface impurities and remove oxides; CoFeZr / Electrodeposition of NF-900s, Pt electrode, Ag / AgCl electrode and NF are used as counter electrode, reference electrode and working electrode respectively. The specific experimental process uses a constant voltage of -1.1V (vs Ag / AgCl electrode) for 900s Electrodeposition. In addition, the electrodeposited material has an area of ​​1 cm 2 ; The prepared material was washed twice with deionized water and ethanol, respectively, and dried under vacuum at 60° C. for 2 h.

[0028] figure 1...

Embodiment 2

[0031] The preparation of a low-crystallinity material of zirconium-doped cobalt-iron layered double hydroxide comprises the following steps:

[0032] will contain 2mM Co(NO 3 ) 2 ·6H 2 O(0.582g), 2mM Fe(NO 3 ) 3 9H 2 O (0.808g), 2mM ZrCl 4 (0.466g), 0.3M KNO 3 (3.03 g) was dissolved in 100 mL of deionized water and stirred at a constant speed for 1 hour to form a homogeneous solution. Subsequently, the substrate NF was put into nitric acid to clean the surface impurities and remove oxides. Then, electrodeposition of CoFeZr / NF-800s was performed by a three-electrode system in the above solution. Pt electrode, Ag / AgCl electrode, and NF were used as auxiliary, reference, and working electrodes, respectively. During the experiment, a constant voltage of -1.1V (vs Ag / AgCl electrode) was used for electrodeposition for 800s. In addition, the electrodeposited material has an area of ​​1 cm 2 . Finally, the as-prepared material was washed twice with deionized water and eth...

Embodiment 3

[0035] The preparation of a low-crystallinity material of zirconium-doped cobalt-iron layered double hydroxide comprises the following steps:

[0036] will contain 2mM Co(NO 3 ) 2 ·6H 2 O(0.582g), 2mM Fe(NO 3 ) 3 9H 2 O (0.808g), 2mM ZrCl 4 (0.466g), 0.3M KNO 3 (3.03 g) was dissolved in 100 mL of deionized water and stirred at a constant speed for 1 hour to form a homogeneous solution. Subsequently, the substrate NF was put into nitric acid to clean the surface impurities and remove oxides. Then, electrodeposition of CoFeZr / NF-1000s was performed by a three-electrode system in the above solution. Pt electrode, Ag / AgCl electrode, and NF were used as auxiliary, reference, and working electrodes, respectively. During the experiment, a constant voltage of -1.1V (vs Ag / AgCl electrode) was used for electrodeposition for 1000 s. In addition, the electrodeposited material has an area of ​​1 cm 2 . Finally, the as-prepared material was washed twice with deionized water and ...

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Abstract

The invention belongs to the technical field of functionalized nanometer electrode materials, and relates to a preparation method of low-crystallinity zirconium-doped ferrocobalt layered double hydroxide. The preparation method comprises the following steps: dissolving a divalent cobalt source, a trivalent iron source and a tetravalent zirconium source in a deionized water solution of potassium nitrate, and carrying out stirring at a constant speed to fully and uniformly mix the above sources; placing a pretreated substrate NF in a solution obtained in the previous step, and carrying out constant-voltage electro-deposition of deposition negative potential for 600-1200 s by using a three-electrode system; and washing a prepared material, and carrying out vacuum drying at 60-80 DEG C for 2-4 hours to obtain the product. The prepared low-crystallinity zirconium-doped ferrocobalt layered double hydroxide is applied as an anode and a cathode of water electrolysis to hydrogen production through water electrolysis. The preparation method disclosed by the invention is simple and easy to operate, wide in raw material source, low in price, mild in reaction and friendly to environment. The prepared catalyst has high bifunctional electrocatalytic activity, can be applied to a full-electrolysis water electrocatalyst of seawater, and can also be used for desalting seawater.

Description

technical field [0001] The invention belongs to the technical field of functionalized nano-electrode materials, and relates to electrocatalysts, in particular to a preparation method of low-crystallinity zirconium-doped cobalt-iron layered double hydroxide and its application to hydrogen production by electrolysis of water. Background technique [0002] As a renewable, non-polluting and clean energy, hydrogen has received extensive attention in the energy field in recent years. In the field of hydrogen production, electrocatalytic water splitting is considered to be a promising and low-cost strategy. Water electrolysis includes the oxygen evolution reaction (OER) at the anode and the hydrogen evolution reaction (HER) at the cathode, but the four-electron reaction kinetics of OER is slow, hindering the efficiency of electrocatalytic water splitting. Currently, platinum-based noble metals are excellent HER catalysts, and ruthenium, iridium, and their alloys exhibit high OER p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04C25D9/04
CPCC25B11/091C25B1/04C25D9/04Y02E60/36
Inventor 包健李倩江坤
Owner JIANGSU UNIV
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