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Single-layer porous NiFe hydrotalcite-based electrocatalytic oxygen evolution electrode as well as preparation method and application thereof

A technology of oxygen evolution electrode and porous nickel, which is applied in the direction of electrode, electrode shape/type, electrolysis process, etc., can solve the problems of high energy consumption, complicated process, unfriendly environment, etc., achieve improved catalytic activity, wide range of raw material sources, increase The effect of distribution range

Active Publication Date: 2019-02-22
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis methods of such materials and electrode preparation methods reported at this stage have limitations, such as the use of hot melt method, high temperature tempering method and other synthesis methods, complex process, high energy consumption, and unfriendly environment.

Method used

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  • Single-layer porous NiFe hydrotalcite-based electrocatalytic oxygen evolution electrode as well as preparation method and application thereof
  • Single-layer porous NiFe hydrotalcite-based electrocatalytic oxygen evolution electrode as well as preparation method and application thereof
  • Single-layer porous NiFe hydrotalcite-based electrocatalytic oxygen evolution electrode as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Preparation of single-layer porous nickel-iron hydrotalcite

[0048] 1) Prepare an aqueous formamide solution (volume fraction of formamide is 23%), and take 20 mL of the aqueous formamide solution. Add 2.5 mol / L NaOH aqueous solution dropwise into the formamide aqueous solution, adjust its pH value to 10, and heat the solution to 80°C.

[0049] 2) Add 20 mL of an aqueous solution containing 0.375 mol / L nickel nitrate and 0.125 mol / L ferric nitrate dropwise into the aqueous formamide solution in step 1). At the same time, 20 mL of 2.5 mol / L NaOH aqueous solution was added dropwise to keep the pH of the solution at 10. During the dropwise addition of nickel nitrate, ferric nitrate mixed aqueous solution and NaOH aqueous solution, floc products gradually appeared in the formamide aqueous solution.

[0050] 3) The floc product obtained in step 2) is centrifuged, and an aqueous solution is used for centrifugal cleaning, and after drying at 60° C. for 6 hours, it becomes a...

Embodiment 2

[0077] Different from Example 1, in the preparation process of the preparation of single-layer porous nickel-iron hydrotalcite, nickel nitrate and ferric nitrate are replaced by nickel chloride and ferric chloride respectively, and the nickel chloride solution and ferric chloride solution The concentrations are 0.375mol / L and 0.125mol / L respectively.

[0078] The single-layer porous nickel-iron hydrotalcite-based electrocatalytic oxygen evolution electrode prepared in this way, its electrocatalytic oxygen evolution performance test shows that the current density j reaches 10mA cm -2 , the required overpotential is 233mV, and the Tafel slope is 48mV dec -1 .

Embodiment 3

[0080] Different from Example 1, in the preparation process of the preparation of single-layer porous nickel-iron hydrotalcite, nickel nitrate and ferric nitrate are replaced by nickel chloride and ferric chloride respectively, and the nickel chloride solution and ferric chloride solution The concentrations are 0.75mol / L and 0.25mol / L respectively.

[0081] The single-layer porous nickel-iron hydrotalcite-based electrocatalytic oxygen evolution electrode prepared in this way, its electrocatalytic oxygen evolution performance test shows that the current density j reaches 10mA cm -2 When the overpotential is 241mV, the Tafel slope is 50mV dec -1 .

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Abstract

The invention provides an electrocatalytic oxygen evolution electrode prepared from single-layer porous NiFe hydrotalcite as a catalytic active component. The single-layer porous NiFe hydrotalcite isshaped like nano-sheets, a lot of small holes are distributed in the nano-sheets, the nano-sheets have the relatively large specific surface area, a lot of edge positions are exposed, and catalytic active sites are greatly increased. The electrocatalytic oxygen evolution electrode shows the excellent activity in an alkaline medium, when the current density reaches 10 mA / cm<-2>, the overpotential is required to be 230 mV only, the Tafel slope is 47 mV / dec<-1>, and the electrocatalytic oxygen evolution electrode is obviously better than the electrochemical oxygen evolution performance of commercial IrO2. Besides, the raw materials of the electrocatalytic oxygen evolution electrode are wide in source, and the electrocatalytic oxygen evolution electrode is low in cost, has the long-term structural and chemical stability and is applicable to industrial use. A preparation method is easy to operate, conditions are mild, the required time is short, and large-scale production can be realized.

Description

technical field [0001] The invention relates to the field of designing an electrocatalytic oxygen evolution electrode, in particular to a single-layer porous nickel-iron hydrotalcite-based electrocatalytic oxygen evolution electrode and its preparation method and application. Background technique [0002] With the rapid increase of the earth's population, the massive consumption of fossil energy and serious environmental problems, people's demand for clean energy is also increasing. Electrocatalytic oxygen evolution reaction (OER) plays an important role in the field of clean energy, such as electrocatalytic water splitting, fuel cells, metal-air batteries, etc. Unfortunately, OER is a four-electron transfer process, which means it is a kinetically slow process. Currently, iridium oxide (IrO 2 ) and ruthenium oxide (RuO 2 ) is considered to be the most efficient OER catalyst, however, factors such as high price and low reserves limit the commercial application of iridium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B11/03C25B1/04
CPCC25B1/04C25B11/031C25B11/051C25B11/075Y02E60/36
Inventor 张铁锐张鑫施润赵运宣尚露周超
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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