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A large-area method for preparing self-supporting high-performance oxygen evolution electrodes at room temperature

An oxygen evolution electrode and large-area technology, which is applied in the field of large-area preparation of self-supporting high-performance oxygen evolution electrodes, can solve the problems of inability to achieve large-area growth, consumption of large energy and waste liquid, and difficult control of growth conditions, and achieve excellent oxygen evolution. Oxygen activity and stability, energy cost saving, low production cost effect

Active Publication Date: 2019-10-29
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The seed growth method needs to prepare a pure phase hydroxide layer, and the growth conditions are not easy to control
In order to obtain a better lamellar structure, the hydrothermal method often needs to add surfactants (such as hexamethyltetrammine, HMT), and is limited by the reaction equipment, and cannot achieve large-area growth; although the electrodeposition method can obtain good two-dimensional materials, It is only suitable for growth on conductive substrates, and the process requires a lot of energy and waste liquid. The complex process and cost requirements make it difficult to be widely used

Method used

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  • A large-area method for preparing self-supporting high-performance oxygen evolution electrodes at room temperature
  • A large-area method for preparing self-supporting high-performance oxygen evolution electrodes at room temperature
  • A large-area method for preparing self-supporting high-performance oxygen evolution electrodes at room temperature

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Disperse the commercial oxide powder (magnesia) in a mixed solvent of ethanol and NMP with a volume ratio of 1:9, and ultrasonically disperse to obtain a 5 mg / mL suspension.

[0029] (2) The suspension solution prepared in step 1 is drip-coated on the surface of the nickel foam substrate, and the coating amount is 0.5mg / cm 2 , and then dried at 60°C.

[0030] (3) Immerse the composite electrode prepared in step 2 into the solution of nickel nitrate and ferrous sulfate, the concentration of metal ions is 0.05M, the molar ratio of Ni / Fe is 8:2, and the reaction time is 0.5 hours.

[0031] (4) The electrode in step 3 was taken out, washed and dried to obtain the target oxygen evolution electrode, which was directly used for OER test.

[0032] pass Figure 1a Digital photos can clearly see that the area is 10*10cm 2 A brown-yellow substance grows on the surface of the blank nickel foam (the color on the left is light) (the color on the right becomes darker).

[0033]...

Embodiment 2

[0036] (1) Disperse commercial oxide powder (alumina) in terpineol solvent, and ultrasonically disperse to obtain a 5 mg / mL suspension.

[0037] (2) Drop-coat the suspension solution prepared in step 1 on the surface of conductive PET, and the coating amount is 0.1mg / cm 2 , and then dried at 60°C.

[0038] (3) Immerse the composite electrode prepared in step 2 into nickel nitrate and cobalt nitrate solution, the metal ion concentration is 0.05M, the Ni / Co molar ratio is 8:2, and the reaction time is 0.5 hours.

[0039] (4) The electrode in step 3 was taken out, washed and dried to obtain the target oxygen evolution electrode, which was directly used for OER test.

[0040] Depend on figure 2 It can be seen that under this growth condition, sheet-like hydroxides can also grow on the electrode surface.

Embodiment 3

[0042] (1) Disperse commercial oxide powder (calcium oxide) in ethyl acetate solvent, and ultrasonically disperse to obtain a 5 mg / mL suspension.

[0043] (2) Drop-coat the suspension solution prepared in step 1 on the surface of the conductive glass substrate, and the coating amount is 3mg / cm 2 , and then dried at 60°C.

[0044](3) Immerse the composite electrode prepared in step 2 in the solution of nickel nitrate and ferrous sulfate, the concentration of metal ions is 0.05M, the molar ratio of Ni / Fe is 8:1, and the reaction time is 0.5 hours.

[0045] (4) The electrode in step 3 was taken out, washed and dried to obtain the target oxygen evolution electrode, which was directly used for OER test.

[0046] Depend on image 3 It can be seen that under this growth condition, sheet-like hydroxides can also grow on the surface of the electrode, and the sheets are thicker due to the higher loading capacity.

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Abstract

The invention discloses a method of large-area preparation of a self-supporting high-performance oxygen evolution electrode at the room temperature, and belongs to the field of electrolyzed water catalysis and oxygen evolution. The method comprises the steps that a layer of alkaline oxide is arranged on a conductive substrate in a loading mode, the conductive substrate and the layer of alkaline oxide are soaked in a transition metal mixed salt solution, a reaction is conducted for a period of time at the room temperature, finally ultra-thin sheet-shaped transition mono-metal and multi-metal hydroxide perpendicularly grows on the conductive substrate in an oriented mode, and then the self-supporting high-performance oxygen evolution electrode is obtained. The method is not limited by substrate materials, and large-area growth can be achieved; the method is conducted at the room temperature, and the energy cost is saved; the method has the universality and can achieve perpendicular and oriented growth of most of two-dimensional sheet-shaped transition mono-metal and multi-metal hydroxide; and part of electrodes prepared according to the method have the quite high electro-catalysis oxygen evolution activity, are much superior to commercial RuO2 catalytic agents, and can be applied to the fields of industrial water electrolysis, metal-air cells and fuel cells.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for preparing a self-supporting high-performance oxygen evolution electrode in a large area at room temperature. Background technique [0002] In recent years, electrocatalytic water splitting reactions for renewable energy storage have attracted much attention. Compared with the two-electron process of hydrogen production, the electrocatalytic water splitting oxygen production reaction (OER), as a four-electron reaction, is a kinetically lagging step in the entire catalytic reaction. Not only that, but the process is key to energy conversion and storage technologies such as recyclable metal-air batteries. However, the most excellent electrocatalysts for traditional water electrolysis are mainly noble metals such as platinum, gold, ruthenium, and the like. In view of the high cost, people continue to explore new efficient and low-cost electrocatalytic oxy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/06C25B11/03C25B1/04H01M4/90H01M12/06
CPCC25B1/04C25B11/031C25B11/077H01M4/9075H01M12/06Y02E60/36
Inventor 郑宗敏华青松戴作强张洪信张鉴
Owner QINGDAO UNIV
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