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Preparation method of metal-layered double hydroxide composite electrode material

A layered bimetallic and hydroxide technology, applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., to achieve multi-functional excellence, promote catalysis, and promote the effect of electrolytic water process

Inactive Publication Date: 2019-09-13
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although great progress has been made in the research of non-noble metal electrocatalysts for OER, it is still a challenge to design and synthesize OER catalysts capable of driving larger current densities at lower overpotentials.

Method used

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  • Preparation method of metal-layered double hydroxide composite electrode material
  • Preparation method of metal-layered double hydroxide composite electrode material
  • Preparation method of metal-layered double hydroxide composite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of iron-nickel alloy-iron-nickel layered double hydroxide

[0031] see figure 1 In the process shown, the iron-nickel alloy sheet (20×40×0.3mm) was cleaned with acetic acid (2M) to remove the surface oxide layer, and then ultrasonically cleaned in ethanol and deionized water for ten minutes. Dissolve nickel nitrate hexahydrate (0.5 mmol), ferric nitrate nonahydrate (0.5 mmol) and urea (5 mmol) in 36 ml of deionized water, and stir until completely dissolved. The solution was then transferred to a steel autoclave, and the prepared iron-nickel alloy foil was then completely immersed in the reaction liquid. The sealed polytetrafluoroethylene-lined stainless steel autoclave (50ml) was transferred to an oven to react at 120°C for 12h, and then naturally cooled to room temperature. Then the reacted iron-nickel alloy foil was taken out, rinsed several times with ethanol and deionized water, and finally placed in a vacuum oven at 80° C. for 6 hours and then ta...

Embodiment 2

[0035] (1) Preparation of iron-iron-nickel layered double hydroxide

[0036] Preparation of iron-iron-nickel layered double hydroxide: except that the iron-nickel alloy foil is replaced by iron foil, the rest is the same as in Example 1.

[0037] (2) Iron-iron-nickel layered double hydroxide for oxygen evolution reaction in water electrolysis

[0038] Iron-iron-nickel layered double hydroxide is used for electrolytic water oxygen evolution reaction: same as embodiment 1, but the reaction efficiency is different, such as Figure 4 shown. Iron-iron-nickel layered double hydroxide, in 0.1M KOH electrolyte, the oxygen evolution reaction has a start-up overpotential of 210mV, and at a current of 10mA / cm 2 The reaction overpotential was 390mV. .

Embodiment 3

[0040] (1) Preparation of nickel-iron-nickel layered double hydroxide

[0041] Preparation of nickel-iron-nickel layered double hydroxide: same as in Example 1, only need to replace the iron-nickel alloy foil with nickel foil.

[0042] (2) Nickel-iron-nickel layered double hydroxide for electrolysis of water oxygen evolution reaction

[0043] Nickel-iron-nickel layered double hydroxide is used for electrolytic water oxygen evolution reaction: same as embodiment 1, but the reaction efficiency is different, such as Figure 4 shown. Iron-iron-nickel layered double hydroxide, in 0.1M KOH electrolyte, the oxygen evolution reaction has a start-up overpotential of 220mV, and at a current of 10mA / cm 2 The reaction overpotential was 410mV. .

[0044] figure 2 and image 3 Be respectively the scanning electron microscope picture and the transmission electron microscope picture of the composite electrode material of the different metal bases that are obtained in embodiment 1 to em...

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Abstract

The invention relates to a preparation method of a metal-layered double hydroxide composite electrode material. The preparation method comprises the following steps: putting a metal substrate into a hydrothermal reaction kettle, adding nitrates of two metals and urea, and carrying out hydrothermal reaction to obtain a target product. Compared with the prior art, a self-supporting electrode with the interface layer-enhanced alloy / double hydroxide nanosheet array is prepared by utilizing a hydrothermal method in the invention, the material has the excellent conductivity of a substrate metal material and the multifunction of a surface vertical nanosheet array structure, and meanwhile, the special interface layer of the material generates an enhancing effect, so that the starting overpotentialrequired by the reaction is greatly reduced, and the oxygen generation electro-catalytic performance of a composite-structure material is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of composite electrode material preparation, and relates to a method for preparing a metal-layer double metal hydroxide composite electrode material. Background technique [0002] With the increasing energy demand of human beings, water electrolysis, as a green and sustainable technology, has attracted more and more attention. As one of the half-reactions of electrolysis water technology, the hydrogen evolution reaction (HER) has great thermodynamic advantages, and the research on the catalytic mechanism is relatively mature and perfect. In contrast, the oxygen evolution reaction (OER) involves complex multiple proton coupling and multiple electron transfer processes, resulting in slower oxygen evolution kinetics and requires a higher overpotential to accelerate the reaction. Therefore, the high water oxidation overpotential limits the efficiency of the total hydrolysis reaction and becomes the bottleneck o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/051C25B11/057C25B11/091Y02E60/36
Inventor 相倩陈文龙李凡吴亿马艳玲邬剑波邓涛陶鹏宋成轶尚文
Owner SHANGHAI JIAO TONG UNIV
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