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Preparation method of a hydrothermally assisted iron oxyhydroxide-nickel-iron hydrotalcite integrated electrode

An iron oxyhydroxide, hydrothermal assisted technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, electrodes, etc., can solve the problem of affecting the long-term operation life of the full electrolytic cell, the catalyst particles are difficult to arrange in an orderly manner, and the utilization rate of the catalyst is not high. problems, to achieve good catalytic activity and stability, uniform size, and controllable morphology

Active Publication Date: 2021-08-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the catalyst prepared by this method has good electrocatalytic activity for oxygen evolution under alkaline conditions, the insurmountable shortcoming of the catalyst is that the supported catalyst with carbon material as the carrier is under the electrolysis voltage of the alkaline full electrolytic cell test. The corrosion problem is relatively serious, which affects the long-term operating life of the full electrolytic cell
Patent CN105618060A describes a non-metallic bifunctional oxygen catalyst of graphene / nickel-iron hydrotalcite. In actual application, it is difficult to arrange the catalyst particles in an orderly manner, so it is difficult to obtain a high degree of dispersion, and the utilization rate of the catalyst is not high.

Method used

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  • Preparation method of a hydrothermally assisted iron oxyhydroxide-nickel-iron hydrotalcite integrated electrode
  • Preparation method of a hydrothermally assisted iron oxyhydroxide-nickel-iron hydrotalcite integrated electrode
  • Preparation method of a hydrothermally assisted iron oxyhydroxide-nickel-iron hydrotalcite integrated electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Preparation: (1) water heating once:

[0049] Dissolve 15mM cobalt nitrate and 0.2M urea in 60mL deionized water; stir thoroughly for 30 minutes to obtain a clear and transparent precursor solution; vertically immerse the cleaned foamed nickel into the precursor solution and react hydrothermally at 120°C 8h; vacuum drying at 80°C for 12h;

[0050] (2) Secondary water heating:

[0051] The basic cobalt carbonate nanowire array loaded on nickel foam obtained by hydrothermal treatment is used as the substrate; 0.5mM nickel nitrate and 0.5mM ferric nitrate, 0.6mM ammonium fluoride, 20mM urea, dissolved in 60mL deionized water, at 120℃ Under the condition of hydrothermal reaction for 8h; vacuum drying at 80°C for 12h, a hydrothermally assisted iron oxyhydroxide-nickel-iron hydrotalcite integrated electrode (FeOOH / NiFe LDHs@CCH NAs-NF) was prepared.

[0052] Depend on figure 1 It can be seen that after two hydrothermal reactions, the controlled synthetic growth on the nick...

Embodiment 2

[0055] As described in Example 1, only the second hydrothermal step was used to prepare an integrated oxygen evolution electrode of iron oxyhydroxide-nickel iron hydrotalcite (FeOOH / NiFe LDHs-NF), 0.5mM nickel nitrate and 0.5mM iron nitrate , 0.6mM ammonium fluoride, 20mM urea, dissolved in 60mL deionized water, hydrothermal reaction at 120°C for 8h; vacuum drying at 80°C for 12h, the hydrothermally assisted iron oxyhydroxide-nickel iron hydrotalcite integrated Oxygen evolution electrode (FeOOH / NiFe LDHs-NF), the test conditions are the same as in Example 1.

[0056] Half-cell test: The half-cell system uses 1M KOH solution saturated with oxygen as the electrolyte, and the integrated electrode performs LSV scanning, such as Figure 4 shown. The integrated electrode prepared by this method is 100mA / cm in 1M KOH electrolyte solution 2 The potential at the electrolysis current density is 1.55V (vs.RHE).

Embodiment 3

[0058] According to the steps described in Example 1, only the basic cobalt carbonate nanowires obtained by the first hydrothermal reaction were loaded on the foamed nickel electrode; at normal temperature, a half-cell test was carried out in a three-electrode system, with 1M KOH solution as the electrolyte, Polarization curves obtained by performing linear voltammetry scans. Test condition is the same as embodiment 1.

[0059] Half-cell test: The half-cell system uses 1M KOH solution saturated with oxygen as the electrolyte, and the integrated electrode performs LSV scanning, such as Figure 5 shown. The integrated electrode prepared by this method has a potential of 1.678V (vs. RHE) under the electrolytic current density of 100mA / cm2 in 1M KOH electrolyte solution.

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Abstract

The invention relates to a preparation method and application of a hydrothermally assisted iron oxyhydroxide-nickel-iron hydrotalcite integrated electrode applied in an alkaline medium; the electrode is used to catalyze oxygen evolution in the process of electrolyzing water to produce hydrogen under alkaline conditions reaction. Advantages: The morphology of highly dispersed nickel-iron hydroxide integrated electrode is controllable; the preparation process is simple and the conditions are mild; it is used in water electrolysis cells to split water and produce hydrogen under external bias voltage. The highly dispersed iron oxyhydroxide / nickel-iron hydrotalcite integrated electrode prepared by the invention has good performance when used as an alkaline solid polymer electrolyte (AEM) water electrolysis cell. The invention has wide application value in renewable fuel cell (RFC), photoelectric catalysis and electrolysis hydrogen generator devices.

Description

technical field [0001] The invention relates to a method for preparing an integrated electrode of ferric oxyhydroxide-nickel-iron hydrotalcite assisted by hydrothermal for alkaline electrolysis of water. The method undergoes steps such as precursor mixing-hydrothermal reaction-washing-vacuum drying to prepare surface-loaded hydrothermal electrodes. The final morphology of the auxiliary iron oxyhydroxide-nickel-iron hydrotalcite integrated electrode catalyst layer is characterized by a basic cobalt carbonate nanowire-supported iron oxyhydroxide-nickel-iron hydrotalcite nanosheet array layer with a height of 2-3 μm and a diameter of 100 nm. The finally obtained integrated electrode can be used as an oxygen evolution electrode used under alkaline conditions, and can be applied in AEM water electrolysis, RFC or various electrolysis devices. Background technique [0002] Water electrolysis offers a clean conversion route from water to hydrogen. If renewable energy is used to pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/054C25B11/067C25B11/091C25B1/04B01J27/232B01J37/10
CPCY02E60/36Y02P20/584
Inventor 俞红梅迟军姜广贾佳覃博文邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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