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Supported nickel-iron composite hydroxide oxygen evolution electrode for alkaline water electrolysis and preparation method for supported nickel-iron composite hydroxide oxygen evolution electrode

A composite hydroxide and oxygen evolution electrode technology, applied in the direction of alkaline battery electrodes, battery electrodes, circuits, etc., can solve the problems of low raw material utilization rate, complicated process, time-consuming, etc., and achieve simple and effective process and mild conditions Effect

Inactive Publication Date: 2015-05-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, the preparation of Ni-Fe oxygen evolution electrode materials by coating-pyrolysis method, electrodeposition method, hydrothermal method and adsorption method has the disadvantages of complex or time-consuming process and low utilization rate of raw materials. These shortcomings are extremely serious. Limit the application prospect and industrial value of these oxygen evolution electrode materials in the electrolysis of alkaline water hydrogen production industry

Method used

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  • Supported nickel-iron composite hydroxide oxygen evolution electrode for alkaline water electrolysis and preparation method for supported nickel-iron composite hydroxide oxygen evolution electrode
  • Supported nickel-iron composite hydroxide oxygen evolution electrode for alkaline water electrolysis and preparation method for supported nickel-iron composite hydroxide oxygen evolution electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 1g nickel nitrate hexahydrate, 0.4g ferric nitrate nonahydrate, 0.8g PTFE emulsion, and 1g conductive acetylene black were sequentially added to 4ml water and ethanol mixed solvent. Then use a glass rod to stir evenly and wait for a small amount of water and ethanol to volatilize to form a paste. This paste is rolled on a roller press into a NiFe with a thickness of 200 μm x salt / C composite film, put the film in an oven to heat up to 120 ℃, heat treatment in air atmosphere for 1 h to obtain NiFe x salt / C Composite membrane. This NiFe x salt The / C composite membrane was placed in 3 M KOH solution for in-situ precipitation reaction at room temperature for 3 hours. NiFe deposited in situ x (OH) y / C composite film is washed and dried, and cut into NiFe with a size of 5cm*6cm x (OH) y / C sheet, then press the sheet on the foamed nickel after degreasing and drying under 10 Mpa pressure to obtain NiFe x (OH) y / C / M oxygen evolution electrode.

Embodiment 2

[0025] In this example, NiFe is obtained x salt The process of the / C composite membrane is the same as in Example 1, except that the metal current collector is pressed first, and then the in-situ precipitation reaction is performed. Upcoming NiFe x salt / C composite film is cut into a size of 5cm*6cm, and pressed on the degreasing and dried nickel foam collector under a pressure of 5Mpa, and then NiFe x salt / C / M composite membrane is placed in 3 M KOH solution for in-situ precipitation reaction at room temperature for 3 hours to obtain NiFe x (OH) y / C / M oxygen evolution electrode.

Embodiment 3

[0027] 3g nickel nitrate hexahydrate, 3g ferric nitrate nonahydrate, 3g PTFE emulsion, 6g Cabot conductive carbon black were sequentially added to 8ml water and ethanol mixed solvent. Then use a glass rod to stir evenly and wait for a small amount of water and ethanol to volatilize to form a paste. This paste is rolled on a roller press into a NiFe with a thickness of 240 μm x salt / C composite film, the film is heated to 200 ℃ in a muffle furnace, heat treatment in air atmosphere for 0.5 h to obtain NiFe x salt / C Composite membrane. This NiFe x salt The / C composite membrane was placed in a 7 M KOH solution for in-situ precipitation at room temperature for 30 minutes. NiFe deposited in situ x (OH) y / C composite film is washed and dried, and then cut into NiFe with a size of 10 cm*10 cm x (OH) y / C sheet, then press the sheet on the degreasing and drying stainless steel net under 20 Mpa pressure to obtain NiFe x (OH) y / C / M oxygen evolution electrode.

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Abstract

The invention discloses supported nickel-iron composite hydroxide oxygen evolution electrode for alkaline water electrolysis and a preparation method for the supported nickel-iron composite hydroxide oxygen evolution electrode. The preparation method comprises the following steps: performing easy physical mixing-rolling on nickel and iron salt solutions, a conductive carrier and a binder to directly obtain a metal salt / carbon film; and performing low-temperature thermal treatment, in-situ precipitation and metal current collector pressing to obtain the supported nickel-iron composite hydroxide oxygen evolution electrode. Through the in-situ precipitation reaction of a metal salt pre-absorbed in the carrier, the dimension of a nickel-iron composite hydroxide catalyst is controlled, and an active site is improved; and secondly, through the in-situ precipitation reaction process, negative ions of a nitrate radical, a sulfate radical and the like are easily inserted into a nickel-iron composite hydroxide lattice, so that the oxygen evolution activity of the electrode is further regulated; moreover, the resistance loss is reduced through an internal structure constructed by the conductive carrier with a high specific surface area. The preparation method for an electrode material has the advantages of being simple, gentle in condition and high in raw material utilization rate, so that the good industrial prospect and a high economic value are shown.

Description

Technical field [0001] The invention belongs to the technical field of electrochemical energy conversion. The invention provides a low overpotential oxygen evolution electrode applied to the electrolysis of alkaline water and a preparation method thereof. Background technique [0002] Electrolyzed water is an effective method for obtaining hydrogen energy, and it is also regarded as a key technology for the future storage of unstable and intermittent solar and wind energy. The theoretical voltage for the decomposition of water into hydrogen and oxygen is 1.23 V. However, due to the slow electrochemical kinetics on the anode and cathode, high polarization overpotential loss is caused, especially during the anode oxygen evolution process (4OH ? ? O 2 + 2H 2 O + 4e ? ), the overpotential is generally as high as 300~500 mV. The anode material is a key factor that affects the energy efficiency and conversion efficiency of anode oxygen evolution. The existing excellent electrocatalys...

Claims

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Application Information

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IPC IPC(8): H01M4/52H01M4/32H01M4/26
CPCH01M4/24H01M4/26H01M4/521Y02E60/10
Inventor 万平玉唐阳陈咏梅钮因健张林影黄孟杰莫恒亮孙艳芝庞然
Owner BEIJING UNIV OF CHEM TECH
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