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Method for preparing oxygen vacancy type metal oxide with controllable acid etching effect

A technology of oxides and oxygen vacancies, which is applied in the direction of cobalt oxide/cobalt hydroxide, electrical components, battery electrodes, etc., can solve the problems of difficult to effectively and accurately control the concentration of oxygen vacancies in manufacturing, difficult to recycle waste materials, and high operating risk factors. Achieve the effects of low cost, wide application range and high safety factor

Pending Publication Date: 2021-10-22
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, it still has the following disadvantages: the synthesis process is cumbersome, the operation risk factor is high, and it involves the process of adding sodium and removing sodium; the implementation conditions are relatively harsh, and anhydrous and oxygen-free must be ensured; Causes a waste of resources; it is difficult to effectively and accurately control the concentration of oxygen vacancies in the metal oxide structure

Method used

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  • Method for preparing oxygen vacancy type metal oxide with controllable acid etching effect
  • Method for preparing oxygen vacancy type metal oxide with controllable acid etching effect
  • Method for preparing oxygen vacancy type metal oxide with controllable acid etching effect

Examples

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Effect test

Embodiment 1

[0039] Prepare a hydrochloric acid solution with a concentration of 4 M and a volume of 20 mL, and add 40 mg of commercial Co 3 o 4 (purchased from Shanghai Macklin Biochemical Technology Co., Ltd.), the obtained mixed solution was acid-etched at 25 °C for 24 h, and then the reaction solution was subjected to high-speed centrifugation at a speed of 4000 r / min to obtain solid components, and then passed through The oxygen vacancy type cobalt tetroxide (Co 3 o 4 –V o –4–24).

[0040] refer to figure 1 , as shown for the commercial pristine Co 3 o 4 and Co 3 o 4 –V o SEM images of –4–24. It can be seen from the figure that both samples exhibit a spherical structure assembled by a large number of nanoparticles. compared to pristine Co 3 o 4 ,Co 3 o 4 –V o The spherical structure of –4–24 was partially acid-etched to form local holes (as indicated by the white dotted line box in the figure).

[0041] refer to figure 2 , as shown for the commercial pristine Co 3 ...

Embodiment 2

[0045] Prepare two hydrochloric acid solutions with a concentration of 6 M and a volume of 24 mL, and add 40 mg of commercial Co 3 o 4 , the resulting mixture was acid-etched at 25 °C for 6 h and 54 h, and then the resulting reaction liquid was subjected to high-speed centrifugation at a speed of 6000 r / min to obtain a solid component, which was passed through deionized water and anhydrous After repeated washing with ethanol for 3 times and drying in a vacuum oven at 60 °C for 12 h, two different oxygen vacancy types of cobalt tetroxide (labeled as Co 3 o 4 –V o –6–6 and Co 3 o 4 –V o –6–54).

[0046] refer to Figure 5 , as shown for the commercial pristine Co 3 o 4 、Co 3 o 4 –V o –6–6 and Co 3 o 4 –V o XRD (a) and Raman (b) spectra of –6–54. It can be seen from figure (a) that the three samples are at 2 θ = 31.3°, 36.8°, 44.8°, 59.4° and 65.2° where typical Co 3 o 4 characteristic diffraction peaks, indicating that the acid etching treatment does not chan...

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Abstract

The invention relates to the technical field of functional metal compound modification, in particular to a method for preparing an oxygen vacancy type metal oxide with a controllable acid etching effect. The method comprises the following steps: preparing an inorganic acid or organic acid solution with a certain concentration, adding a certain amount of original metal oxide into the acid solution, performing acid etching reaction at 25-50 DEG C for 1-80 hours, performing centrifugation to realize solid-liquid separation, and performing subsequent deionized water and absolute ethyl alcohol washing and drying to obtain the oxygen vacancy type metal oxide. The material preparation process is simple, the condition is mild, the cost is low, the efficiency is high, and large-scale application can be achieved; the oxygen vacancy concentration of the surface interface of the metal oxide can be effectively and accurately regulated and controlled by selecting and adjusting conditions such as the acid liquor category, the temperature and the time of the acid etching reaction and the like; and the reacted acid liquor can still be recycled and repeatedly utilized.

Description

technical field [0001] The invention relates to the technical field of modification of functional metal compounds, in particular to a method for preparing oxygen vacancy metal oxides with controllable acid etching effect. Background technique [0002] As the contradiction between the increasing consumption of non-renewable fossil fuels and people's ever-increasing demand for energy use becomes increasingly prominent, the exploration and development of new green renewable energy sources (such as wind energy, solar energy, tidal energy, etc.) is of great significance to the sustainable development of human beings. Rational utilization of energy storage and conversion devices based on electrochemical principles is the key to realize the efficient utilization of such renewable energy. [0003] As a new generation of electrochemical energy storage technology with the most development potential, metal-air batteries have attracted much attention due to their high theoretical energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/04H01M4/88H01M4/90
CPCC01G51/04H01M4/9016H01M4/88C01P2004/03C01P2002/72C01P2002/82C01P2006/40Y02E60/50
Inventor 陈梁侯朝辉任雯晴许文苑尹红黄军林
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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