High-valence metal ion doped oxygen vacancy-rich cobalt oxide nano composite material and preparation and application thereof

A technology of nanocomposite materials and metal ions, which is applied in the field of cobalt oxide nanocomposites doped with high-valence metal ions and rich in oxygen vacancies and its preparation, to achieve good reproducibility, increase diversity, and improve intrinsic conductivity Effect

Active Publication Date: 2021-10-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the strategy of combining the two defect structures of doping and vacancies is still rare in the preparation of electrocatalyst materials.

Method used

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  • High-valence metal ion doped oxygen vacancy-rich cobalt oxide nano composite material and preparation and application thereof
  • High-valence metal ion doped oxygen vacancy-rich cobalt oxide nano composite material and preparation and application thereof
  • High-valence metal ion doped oxygen vacancy-rich cobalt oxide nano composite material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: CoO x Preparation and its oxygen evolution performance (without doping high-valence metal ions)

[0043] Take cobalt nitrate (0.582g, 2mmol) and dissolve it in 20mL DI, take urea (0.6g, 10mmol) and dissolve it in 20mL DI, mix the two evenly, transfer the solution to a 50mL hydrothermal kettle; add pretreated 4×1cm Foam nickel substrate, react at 120°C for 6 hours. After the reaction was completed, it was naturally cooled to room temperature, and the nickel foam substrate was taken out, rinsed several times with deionized water and absolute ethanol, and vacuum-dried at 60°C for 12 hours to obtain the precursor material.

[0044] The prepared nickel foam (loaded with precursor material 0.01g) was placed in a porcelain boat, and 1.0g NaBH was weighed 4 Placed in another porcelain boat. loaded with NaBH 4 The porcelain boat is placed upstream, and the porcelain boat filled with nickel foam is placed in the middle section of the tube furnace. Under nitrogen a...

Embodiment 2

[0047] Example 2: W / CoO x Preparation of -1 and its oxygen evolution performance

[0048] Dissolve cobalt chloride (0.582g, 2.45mmol) and sodium tungstate (0.04g, 0.12mmol) in 20mL DI, and dissolve urea (0.6 g, 10mmol) in 20mL DI. 50mL hydrothermal kettle; add pretreated 4×1 cm foam nickel substrate, and react at 120°C for 6 hours. After the reaction was completed, it was naturally cooled to room temperature, and the nickel foam substrate was taken out, rinsed several times with deionized water and absolute ethanol, and vacuum-dried at 60°C for 12 hours to obtain the precursor material.

[0049] The prepared nickel foam (loaded with 0.007g of precursor material) was placed in a porcelain boat, and 1.0g of NaBH was weighed 4 Placed in another porcelain boat. loaded with NaBH 4 The porcelain boat is placed upstream, and the porcelain boat filled with nickel foam is placed in the middle section of the tube furnace. In a nitrogen atmosphere, the temperature was raised to 350°...

Embodiment 3

[0051] Example 3: Mo / CoO x Preparation of -2 and its oxygen evolution performance

[0052] Dissolve cobalt acetate (0.582g, 2.3mmol) and sodium molybdate (0.12g, 0.5mmol) in 20mL DI, dissolve urea (0.6g, 10mmol) in 20mL DI, mix the two evenly, and transfer the solution to 50mL In a hydrothermal kettle; add a pretreated 4×1cm foam nickel substrate, and react at 120°C for 6 hours. After the reaction was completed, it was naturally cooled to room temperature, and the nickel foam substrate was taken out, rinsed several times with deionized water and absolute ethanol, and vacuum-dried at 60°C for 12 hours to obtain the precursor material.

[0053] The prepared nickel foam (loaded with precursor material 0.008g) was placed in a porcelain boat, and 1.0g NaBH was weighed 4 Placed in another porcelain boat. loaded with NaBH 4 The porcelain boat is placed upstream, and the porcelain boat filled with nickel foam is placed in the middle section of the tube furnace. In a nitrogen atmo...

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Abstract

The invention provides a high-valence metal ion doped oxygen vacancy-rich cobalt oxide nano composite material. A preparation method of the material comprises the following steps: mixing a mixed aqueous solution of cobalt salt and metal M salt (M = Mo or W) with a urea aqueous solution to obtain a precursor solution, adding a pretreated foamed nickel substrate, reacting at 90-160 DEG C for 1-12 hours to obtain a precursor material on the foamed nickel substrate, putting the precursor and NaBH4 into a tubular furnace, raising the temperature to 300-350 DEG C under the protection of inert gas, and calcining for 2-9 hours so as to obtain the product. According to the invention, a mode of doping metal cations and introducing oxygen vacancies is adopted, so that the electronic structure and the carrier concentration of the material are effectively regulated and controlled, and the intrinsic conductivity of the material and the diversity of redox reaction are improved; the microstructure of the composite nano material is further adjusted, the specific surface area of the composite nano material is increased, and the transmission path of ions is effectively shortened; the material is used as an oxygen evolution reaction electrode and shows excellent oxygen evolution catalytic performance and stability in an alkaline system.

Description

technical field [0001] The invention belongs to the technical field of nanostructure functional materials and electrocatalytic oxygen evolution, and specifically relates to a cobalt oxide rich in oxygen vacancies doped with high-valence metal ions (denoted as: M / CoO x , metal cation M is Mo, W) nanocomposite material and preparation method thereof, and application in electrocatalytic oxygen evolution reaction. Background technique [0002] In order to overcome the dependence on traditional fossil fuels and alleviate environmental pollution, it is imperative to develop renewable and clean energy. Hydrogen energy is regarded as the most potential clean energy due to its advantages such as extremely high energy density, high heat conversion efficiency, and zero pollution of combustion products. Among various hydrogen production technologies, electrocatalytic water splitting is an important means of industrial hydrogen production. It has the characteristics of zero emission, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/031C25B11/052C25B11/061C25B11/091C25B1/04
CPCC25B11/031C25B11/052C25B11/061C25B11/091C25B1/04Y02E60/36
Inventor 郑灵霞杨鹏举郑华均王永智
Owner ZHEJIANG UNIV OF TECH
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