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Oxygen-vacancy-rich cobalt oxide nanocomposites doped with high-valence metal ions and its preparation and application

A nanocomposite material and metal ion technology, which is applied in the field of high-valence metal ion doped cobalt oxide nanocomposite rich in oxygen vacancies and its preparation, and achieves the effects of improving oxygen evolution performance, low overpotential and good reproducibility

Active Publication Date: 2022-06-21
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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  • Oxygen-vacancy-rich cobalt oxide nanocomposites doped with high-valence metal ions and its preparation and application
  • Oxygen-vacancy-rich cobalt oxide nanocomposites doped with high-valence metal ions and its preparation and application
  • Oxygen-vacancy-rich cobalt oxide nanocomposites doped with high-valence metal ions and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: CoO x Preparation and Oxygen Evolution Performance (Undoped High-valence Metal Ions)

[0043] Get cobalt nitrate (0.582g, 2mmol) and dissolve in 20mL DI, get urea (0.6g, 10mmol) and dissolve in 20mL DI, after the two are mixed evenly, the solution is transferred to 50mL hydrothermal kettle; add pretreated 4 × 1cm The foamed nickel substrate was reacted at 120°C for 6 hours. After the reaction is completed, it is naturally cooled to room temperature, the foamed nickel substrate is taken out, washed several times with deionized water and absolute ethanol, and dried in vacuum at 60° C. for 12 hours to obtain the precursor material.

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

Embodiment 2

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

[0048] Take cobalt chloride (0.582g, 2.45mmol) and sodium tungstate (0.04g, 0.12mmol) and dissolve them in 20mL DI, take urea (0.6g, 10mmol) and dissolve them in 20mL DI, mix them well and transfer the solution to 50mL hydrothermal kettle; add the pretreated 4 × 1 cm nickel foam matrix, and react at 120 °C for 6 hours. After the reaction is completed, it is naturally cooled to room temperature, the foamed nickel substrate is taken out, washed several times with deionized water and absolute ethanol, and dried in vacuum 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 the 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 with nickel foam is placed in the middle section of the tube furna...

Embodiment 3

[0051] Example 3: Mo / CoO x Preparation of -2 and Its Oxygen Evolution Properties

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

[0053] The prepared nickel foam (loaded with 0.008g 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 with nickel foam is placed in the middle section of the tube furnace. In a nitro...

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Abstract

A cobalt oxide nanocomposite material rich in oxygen vacancies doped with high-valence metal ions, the preparation method is: mixing a mixed aqueous solution of a cobalt salt and a metal M salt (M=Mo or W) with an aqueous urea solution to obtain a precursor solution, Add the pretreated nickel foam substrate, react at 90-160°C for 1-12 hours, obtain the precursor material on the foam nickel substrate, and mix it with NaBH 4 Put it into a tube furnace, heat up to 300-350°C and calcined for 2-9 hours under the protection of inert gas; the present invention adopts the method of doping metal cations and introducing oxygen vacancies to effectively control the electronic structure and carrier concentration of the material , improve the intrinsic conductivity of the material and the diversity of redox reactions; further adjust the microscopic morphology of composite nanomaterials, increase their specific surface area, and effectively shorten the ion transmission path; use this type of material as an oxygen evolution reaction electrode , showing excellent oxygen evolution catalytic performance and stability in alkaline system.

Description

technical field [0001] The invention belongs to the technical field of nanostructure functional materials and electrocatalytic oxygen evolution, and in particular relates to a high-valence metal ion doped cobalt oxide rich in oxygen vacancies (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 high energy density, high heat conversion efficiency, and zero pollution from 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, high hydrogen production purity, an...

Claims

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Application Information

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Patent Type & Authority Patents(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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