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Ternary CoFeCr hydrotalcite nanorod and preparation method and application thereof

A nanorod and hydrotalcite technology, applied in nanotechnology, chemical instruments and methods, electrodes, etc., can solve the problems of poor oxygen evolution performance of electrolytic water, complicated preparation process, and low production efficiency, and achieve good oxygen evolution performance of electrolytic water , simple preparation process and low production cost

Inactive Publication Date: 2018-11-30
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the catalytic activity of the transition metal oxides used as electrolytic water oxygen evolution catalysts in the prior art is still low, the electrolytic water oxygen evolution performance is still poor, the overpotential is high, the stability is poor, the preparation process is complicated, and the production efficiency is low. Higher cost and other technical problems, the present invention provides a ternary CoFeCr hydrotalcite nanorod and its preparation method and application, which not only have better electrolytic water oxygen evolution performance than the transition metal oxides in the prior art, but also have better overpotential Low cost, good stability, simple preparation process, fast and efficient, low production energy consumption, low production cost, environmental protection and no pollution, suitable for large-scale industrial production

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  • Ternary CoFeCr hydrotalcite nanorod and preparation method and application thereof
  • Ternary CoFeCr hydrotalcite nanorod and preparation method and application thereof
  • Ternary CoFeCr hydrotalcite nanorod and preparation method and application thereof

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preparation example Construction

[0023] A kind of ternary CoFeCr hydrotalcite nanorod, its preparation method comprises the following steps:

[0024] Step A, mix cobalt nitrate, ferric nitrate, chromium nitrate, urea, ammonium fluoride together in water, make the concentration of cobalt nitrate in the solution after mixing be 40~80 mmol / liter, the concentration of ferric nitrate be 8~20 The concentration of chromium nitrate is 8-20 mmol / liter, the concentration of urea is 0.5-0.8 mole / liter, and the concentration of ammonium fluoride is 0.2-0.3 mole / liter, so as to prepare the precursor mixed solution.

[0025] Step B, placing the substrate in the precursor mixed solution, and transferring the substrate and the precursor mixed solution into an autoclave, and then reacting at 110-130° C. for 360-600 minutes, so that the substrate Ternary CoFeCr hydrotalcite nanorods (that is, CoFeCr-LDHs nanorods) were prepared.

[0026] Wherein, the substrate can be nickel foam (Nickel Foam, NF), copper foam, carbon cloth or...

Embodiment 1

[0035] A kind of ternary CoFeCr hydrotalcite nanorod, its preparation method comprises the steps:

[0036] Step a, mix cobalt nitrate, ferric nitrate, chromium nitrate, urea, ammonium fluoride together in water, make the concentration of cobalt nitrate in the solution after mixing be 60 mmol / liter, ferric nitrate concentration be 10 mmol / liter, nitric acid The concentration of chromium is 10 mmol / L, the concentration of urea is 0.6 mol / L, and the concentration of ammonium fluoride is 0.25 mol / L, so as to prepare the precursor mixed solution.

[0037] Step b, using nickel foam with a size of 1×4cm as the substrate, placing the substrate in the precursor mixed solution, and transferring the substrate and the precursor mixed solution to a 25mL autoclave, and then The reaction was carried out at 120°C for 480 minutes to prepare ternary CoFeCr hydrotalcite nanorods on the nickel foam substrate.

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Abstract

The invention discloses a ternary CoFeCr hydrotalcite nanorod and a preparation method and application thereof. The preparation method comprises the steps: mixing cobalt nitrate, iron nitrate, chromium nitrate, urea and ammonium fluoride in water so as to prepare a precursor mixed solution, placing a substrate in the precursor mixed solution, transferring the substrate together with the precursormixed solution to an autoclave, and then performing a reacting at 110-130 DEG C for 360-600 minutes so as to prepare the ternary CoFeCr hydrotalcite nanorod on the substrate. The ternary CoFeCr hydrotalcite nanorod together with the substrate is directly used as a working electrode for electrochemical decomposition of water. Not only the ternary CoFeCr hydrotalcite nanorod has better performance of water electrolysis and oxygen evolution than transition metal oxide in the prior art, but also the preparation process is simple, fast and efficient, has low production energy consumption, low production cost, environmental protection and no pollution, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of transition metal oxide nanomaterials, in particular to a ternary CoFeCr hydrotalcite nanorod and a preparation method and application thereof. Background technique [0002] Excessive use of fossil fuels will cause air pollution and exacerbate global warming. Therefore, it is urgent to find clean and sustainable new energy sources to replace fossil fuels. Hydrogen energy has the advantages of rich sources, high combustion value, green and pollution-free, so hydrogen energy is expected to become an important energy source in the future. In the application of hydrogen energy, hydrogen storage is the premise, and hydrogen production is the key. Hydrogen production by electrolysis of water has become the most promising means of hydrogen production due to its high product purity, simple process, environmental protection and no pollution. In the electrolytic water hydrogen production process, the oxygen evolution reacti...

Claims

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Application Information

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IPC IPC(8): C01G51/00B82Y40/00C25B11/06C25B1/04
CPCB82Y40/00C01G51/006C01P2002/72C01P2002/85C01P2004/03C01P2004/16C25B1/04C25B11/04Y02E60/36
Inventor 李越温路路孙一强俞洁刑昌昌蔡伟平
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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